第一次用ffplay播放视频的过程以及ffplay使用说明书

编译好的ffmpeg文件夹下有ffplay和ffplay_g两个可执行文件,发现这两个功能是一样的,不知道到底什么区别.

其他的可执行文件,也是这个样子的.

=======

直接输入ffplay后



root@ubuntu:/home/zhangbin/Documents/ffmpeg# ffplay

FFplay version SVN-r26268, Copyright (c) 2003-2011 the FFmpeg developers



built on Jan 8 2011 09:20:02 with gcc 4.4.3

编译的配置信息

configuration: --enable-shared --enable-gpl --enable-nonfree --enable-pthreads --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libxvid --enable-x11grab --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrnb --enable-version3



用到的库

libavutil 50.36. 0 / 50.36. 0

libavcore 0.16. 0 / 0.16. 0

libavcodec 52.107. 0 / 52.107. 0

libavformat 52.92. 0 / 52.92. 0

libavdevice 52. 2. 3 / 52. 2. 3

libavfilter 1.72. 0 / 1.72. 0

libswscale 0.12. 0 / 0.12. 0

Simple media player

用法

usage: ffplay [options] input_file

An input file must be specified

Use -h to get full help or, even better, run 'man ffplay'

root@ubuntu:/home/zhangbin/Documents/ffmpeg#



==========

ffplay的帮助文档

==========



FFPLAY(1) FFPLAY(1)







NAME

ffplay - FFplay media player



SYNOPSIS

ffplay [options] input_file



DESCRIPTION

FFplay is a very simple and portable media player using the FFmpeg

libraries and the SDL library. It is mostly used as a testbed for the

various FFmpeg APIs.



OPTIONS

All the numerical options, if not specified otherwise, accept in input

a string representing a number, which may contain one of the

International System number postfixes, for example 'K', 'M', 'G'. If

'i' is appended after the postfix, powers of 2 are used instead of

powers of 10. The 'B' postfix multiplies the value for 8, and can be

appended after another postfix or used alone. This allows using for

example 'KB', 'MiB', 'G' and 'B' as postfix.



Options which do not take arguments are boolean options, and set the

corresponding value to true. They can be set to false by prefixing with

"no" the option name, for example using "-nofoo" in the commandline

will set to false the boolean option with name "foo".

-----------------------------------

Generic options 通用选项

These options are shared amongst the ff* tools. ff*工具都公用这些选项



-L Show license.



-h, -?, -help, --help

Show help.



-version

Show version.



-formats

Show available formats.



The fields preceding the format names have the following meanings:



D Decoding available



E Encoding available



-codecs

Show available codecs.



The fields preceding the codec names have the following meanings:



D Decoding available



E Encoding available

V/A/S

Video/audio/subtitle codec



S Codec supports slices



D Codec supports direct rendering



T Codec can handle input truncated at random locations instead of

only at frame boundaries



-bsfs

Show available bitstream filters.



-protocols

Show available protocols.



-filters

Show available libavfilter filters.



-pix_fmts

Show available pixel formats.



-loglevel loglevel

Set the logging level used by the library. loglevel is a number or

a string containing one of the following values:



quiet

panic

fatal

error

warning

info

verbose

debug



By default the program logs to stderr, if coloring is supported by

the terminal, colors are used to mark errors and warnings. Log

coloring can be disabled setting the environment variable

FFMPEG_FORCE_NOCOLOR or NO_COLOR, or can be forced setting the

environment variable FFMPEG_FORCE_COLOR. The use of the

environment variable NO_COLOR is deprecated and will be dropped in

a following FFmpeg version.

----------------------------------

Main options 主要选项

-x width

Force displayed width.



-y height

Force displayed height.



-s size

Set frame size (WxH or abbreviation), needed for videos which don't

contain a header with the frame size like raw YUV.



-an Disable audio.



-vn Disable video.



-ss pos

Seek to a given position in seconds.



-t duration

play <duration> seconds of audio/video



-bytes

Seek by bytes.



-nodisp

Disable graphical display.



-f fmt

Force format.



-window_title title

Set window title (default is the input filename).



-loop number

Loops movie playback <number> times. 0 means forever.



-vf filter_graph

filter_graph is a description of the filter graph to apply to the

input video. Use the option "-filters" to show all the available

filters (including also sources and sinks).

-------------------------------------------------

Advanced options 高级选项

-pix_fmt format

Set pixel format.



-stats

Show the stream duration, the codec parameters, the current

position in the stream and the audio/video synchronisation drift.



-debug

Print specific debug info.



-bug

Work around bugs.



-vismv

Visualize motion vectors.



-fast

Non-spec-compliant optimizations.



-genpts

Generate pts.



-rtp_tcp

Force RTP/TCP protocol usage instead of RTP/UDP. It is only

meaningful if you are streaming with the RTSP protocol.



-sync type

Set the master clock to audio ("type=audio"), video ("type=video")

or external ("type=ext"). Default is audio. The master clock is

used to control audio-video synchronization. Most media players use

audio as master clock, but in some cases (streaming or high quality

broadcast) it is necessary to change that. This option is mainly

used for debugging purposes.



-threads count

Set the thread count.



-ast audio_stream_number

Select the desired audio stream number, counting from 0. The number

refers to the list of all the input audio streams. If it is greater

than the number of audio streams minus one, then the last one is

selected, if it is negative the audio playback is disabled.



-vst video_stream_number

Select the desired video stream number, counting from 0. The number

refers to the list of all the input video streams. If it is greater

than the number of video streams minus one, then the last one is

selected, if it is negative the video playback is disabled.



-sst subtitle_stream_number

Select the desired subtitle stream number, counting from 0. The

number refers to the list of all the input subtitle streams. If it

is greater than the number of subtitle streams minus one, then the

last one is selected, if it is negative the subtitle rendering is

disabled.



-autoexit

Exit when video is done playing.



-exitonkeydown

Exit if any key is pressed.



-exitonmousedown

Exit if any mouse button is pressed.

-------------------------------------------------

While playing 快捷键

q, ESC

Quit.



f Toggle full screen.



p, SPC

Pause.



a Cycle audio channel.



v Cycle video channel.



t Cycle subtitle channel.



w Show audio waves.



left/right

Seek backward/forward 10 seconds.



down/up

Seek backward/forward 1 minute.



mouse click

Seek to percentage in file corresponding to fraction of width.

-------------------------------------------------

EXPRESSION EVALUATION 表达式

When evaluating an arithemetic expression, FFmpeg uses an internal

formula evaluator, implemented through the libavutil/eval.h interface.



An expression may contain unary, binary operators, constants, and

functions.



Two expressions expr1 and expr2 can be combined to form another

expression "expr1;expr2". expr1 and expr2 are evaluated in turn, and

the new expression evaluates to the value of expr2.



The following binary operators are available: "+", "-", "*", "/", "^".



The following unary operators are available: "+", "-".



The following functions are available:



sinh(x)

cosh(x)

tanh(x)

sin(x)

cos(x)

tan(x)

atan(x)

asin(x)

acos(x)

exp(x)

log(x)

abs(x)

squish(x)

gauss(x)

isnan(x)

Return 1.0 if x is NAN, 0.0 otherwise.



mod(x, y)

max(x, y)

min(x, y)

eq(x, y)

gte(x, y)

gt(x, y)

lte(x, y)

lt(x, y)

st(var, expr)

Allow to store the value of the expression expr in an internal

variable. var specifies the number of the variable where to store

the value, and it is a value ranging from 0 to 9. The function

returns the value stored in the internal variable.



ld(var)

Allow to load the value of the internal variable with number var,

which was previosly stored with st(var, expr). The function

returns the loaded value.



while(cond, expr)

Evaluate expression expr while the expression cond is non-zero, and

returns the value of the last expr evaluation, or NAN if cond was

always false.



Note that:



"*" works like AND



"+" works like OR



thus



if A then B else C



is equivalent to



A*B + not(A)*C



When A evaluates to either 1 or 0, that is the same as



A*B + eq(A,0)*C



In your C code, you can extend the list of unary and binary functions,

and define recognized constants, so that they are available for your

expressions.



The evaluator also recognizes the International System number

postfixes. If 'i' is appended after the postfix, powers of 2 are used

instead of powers of 10. The 'B' postfix multiplies the value for 8,

and can be appended after another postfix or used alone. This allows

using for example 'KB', 'MiB', 'G' and 'B' as postfix.



Follows the list of available International System postfixes, with

indication of the corresponding powers of 10 and of 2.



y -24 / -80



z -21 / -70



a -18 / -60



f -15 / -50



p -12 / -40



n -9 / -30



u -6 / -20



m -3 / -10



c -2



d -1



h 2



k 3 / 10



K 3 / 10



M 6 / 20



G 9 / 30



T 12 / 40



P 15 / 40



E 18 / 50



Z 21 / 60



Y 24 / 70

-------------------------------------------------

INPUT DEVICES 输入设备

Input devices are configured elements in FFmpeg which allow to access

the data coming from a multimedia device attached to your system.



When you configure your FFmpeg build, all the supported input devices

are enabled by default. You can list all available ones using the

configure option "--list-indevs".



You can disable all the input devices using the configure option

"--disable-indevs", and selectively enable an input device using the

option "--enable-indev=INDEV", or you can disable a particular input

device using the option "--disable-indev=INDEV".



The option "-formats" of the ff* tools will display the list of

supported input devices (amongst the demuxers).



A description of the currently available input devices follows.



alsa

ALSA (Advanced Linux Sound Architecture) input device.



To enable this input device during configuration you need libasound

installed on your system.



This device allows capturing from an ALSA device. The name of the

device to capture has to be an ALSA card identifier.



An ALSA identifier has the syntax:



hw:<CARD>[,<DEV>[,<SUBDEV>]]



where the DEV and SUBDEV components are optional.



The three arguments (in order: CARD,DEV,SUBDEV) specify card number or

identifier, device number and subdevice number (-1 means any).



To see the list of cards currently recognized by your system check the

files /proc/asound/cards and /proc/asound/devices.



For example to capture with ffmpeg from an ALSA device with card id 0,

you may run the command:



ffmpeg -f alsa -i hw:0 alsaout.wav



For more information see:

<http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html>



bktr

BSD video input device.



dv1394

Linux DV 1394 input device.



jack

JACK input device.



To enable this input device during configuration you need libjack

installed on your system.



A JACK input device creates one or more JACK writable clients, one for

each audio channel, with name client_name:input_N, where client_name is

the name provided by the application, and N is a number which

identifies the channel. Each writable client will send the acquired

data to the FFmpeg input device.



Once you have created one or more JACK readable clients, you need to

connect them to one or more JACK writable clients.



To connect or disconnect JACK clients you can use the jack_connect and

jack_disconnect programs, or do it through a graphical interface, for

example with qjackctl.



To list the JACK clients and their properties you can invoke the

command jack_lsp.



Follows an example which shows how to capture a JACK readable client

with ffmpeg.



# Create a JACK writable client with name "ffmpeg".

$ ffmpeg -f jack -i ffmpeg -y out.wav



# Start the sample jack_metro readable client.

$ jack_metro -b 120 -d 0.2 -f 4000



# List the current JACK clients.

$ jack_lsp -c

system:capture_1

system:capture_2

system:playback_1

system:playback_2

ffmpeg:input_1

metro:120_bpm



# Connect metro to the ffmpeg writable client.

$ jack_connect metro:120_bpm ffmpeg:input_1



For more information read: <http://jackaudio.org/>



libdc1394

IIDC1394 input device, based on libdc1394 and libraw1394.



oss

Open Sound System input device.



The filename to provide to the input device is the device node

representing the OSS input device, and is usually set to /dev/dsp.



For example to grab from /dev/dsp using ffmpeg use the command:



ffmpeg -f oss -i /dev/dsp /tmp/oss.wav



For more information about OSS see:

<http://manuals.opensound.com/usersguide/dsp.html>

-------------------------------------------------

video4linux and video4linux2

Video4Linux and Video4Linux2 input video devices.



The name of the device to grab is a file device node, usually Linux

systems tend to automatically create such nodes when the device (e.g.

an USB webcam) is plugged into the system, and has a name of the kind

/dev/videoN, where N is a number associated to the device.



Video4Linux and Video4Linux2 devices only support a limited set of

widthxheight sizes and framerates. You can check which are supported

for example with the command dov4l for Video4Linux devices and the

command v4l-info for Video4Linux2 devices.



If the size for the device is set to 0x0, the input device will try to

autodetect the size to use. Only for the video4linux2 device, if the

frame rate is set to 0/0 the input device will use the frame rate value

already set in the driver.



Video4Linux support is deprecated since Linux 2.6.30, and will be

dropped in later versions.



Follow some usage examples of the video4linux devices with the ff*

tools.



# Grab and show the input of a video4linux device, frame rate is set

# to the default of 25/1.

ffplay -s 320x240 -f video4linux /dev/video0



# Grab and show the input of a video4linux2 device, autoadjust size.

ffplay -f video4linux2 /dev/video0



# Grab and record the input of a video4linux2 device, autoadjust size,

# frame rate value defaults to 0/0 so it is read from the video4linux2

# driver.

ffmpeg -f video4linux2 -i /dev/video0 out.mpeg



vfwcap

VfW (Video for Windows) capture input device.



The filename passed as input is the capture driver number, ranging from

0 to 9. You may use "list" as filename to print a list of drivers. Any

other filename will be interpreted as device number 0.



x11grab

X11 video input device.



This device allows to capture a region of an X11 display.



The filename passed as input has the syntax:



[<hostname>]:<display_number>.<screen_number>[+<x_offset>,<y_offset>]



hostname:display_number.screen_number specifies the X11 display name of

the screen to grab from. hostname can be ommitted, and defaults to

"localhost". The environment variable DISPLAY contains the default

display name.



x_offset and y_offset specify the offsets of the grabbed area with

respect to the top-left border of the X11 screen. They default to 0.



Check the X11 documentation (e.g. man X) for more detailed information.



Use the dpyinfo program for getting basic information about the

properties of your X11 display (e.g. grep for "name" or "dimensions").



For example to grab from :0.0 using ffmpeg:



ffmpeg -f x11grab -r 25 -s cif -i :0.0 out.mpg



# Grab at position 10,20.

ffmpeg -f x11grab -25 -s cif -i :0.0+10,20 out.mpg

-------------------------------------------------

OUTPUT DEVICES 输出设备

Output devices are configured elements in FFmpeg which allow to write

multimedia data to an output device attached to your system.



When you configure your FFmpeg build, all the supported output devices

are enabled by default. You can list all available ones using the

configure option "--list-outdevs".



You can disable all the output devices using the configure option

"--disable-outdevs", and selectively enable an output device using the

option "--enable-outdev=OUTDEV", or you can disable a particular input

device using the option "--disable-outdev=OUTDEV".



The option "-formats" of the ff* tools will display the list of enabled

output devices (amongst the muxers).



A description of the currently available output devices follows.



alsa

ALSA (Advanced Linux Sound Architecture) output device.



oss

OSS (Open Sound System) output device.

-------------------------------------------------

PROTOCOLS 协议

Protocols are configured elements in FFmpeg which allow to access

resources which require the use of a particular protocol.



When you configure your FFmpeg build, all the supported protocols are

enabled by default. You can list all available ones using the configure

option "--list-protocols".



You can disable all the protocols using the configure option

"--disable-protocols", and selectively enable a protocol using the

option "--enable-protocol=PROTOCOL", or you can disable a particular

protocol using the option "--disable-protocol=PROTOCOL".



The option "-protocols" of the ff* tools will display the list of

supported protocols.



A description of the currently available protocols follows.

-------------------------------------------------

concat

Physical concatenation protocol.



Allow to read and seek from many resource in sequence as if they were a

unique resource.



A URL accepted by this protocol has the syntax:



concat:<URL1>|<URL2>|...|<URLN>



where URL1, URL2, ..., URLN are the urls of the resource to be

concatenated, each one possibly specifying a distinct protocol.



For example to read a sequence of files split1.mpeg, split2.mpeg,

split3.mpeg with ffplay use the command:



ffplay concat:split1.mpeg/|split2.mpeg/|split3.mpeg



Note that you may need to escape the character "|" which is special for

many shells.

-------------------------------------------------

file 文件访问协议

File access protocol.



Allow to read from or read to a file.



For example to read from a file input.mpeg with ffmpeg use the command:



ffmpeg -i file:input.mpeg output.mpeg



The ff* tools default to the file protocol, that is a resource

specified with the name "FILE.mpeg" is interpreted as the URL

"file:FILE.mpeg".



gopher

Gopher protocol.



http

HTTP (Hyper Text Transfer Protocol).



mmst

MMS (Microsoft Media Server) protocol over TCP.



mmsh

MMS (Microsoft Media Server) protocol over HTTP.



The required syntax is:



mmsh://<server>[:<port>][/<app>][/<playpath>]



md5

MD5 output protocol.



Computes the MD5 hash of the data to be written, and on close writes

this to the designated output or stdout if none is specified. It can be

used to test muxers without writing an actual file.



Some examples follow.



# Write the MD5 hash of the encoded ***I file to the file output.avi.md5.

ffmpeg -i input.flv -f avi -y md5:output.avi.md5



# Write the MD5 hash of the encoded ***I file to stdout.

ffmpeg -i input.flv -f avi -y md5:



Note that some formats (typically MOV) require the output protocol to

be seekable, so they will fail with the MD5 output protocol.

-------------------------------------------------

pipe unix的管道访问协议

UNIX pipe access protocol.



Allow to read and write from UNIX pipes.



The accepted syntax is:



pipe:[<number>]



number is the number corresponding to the file descriptor of the pipe

(e.g. 0 for stdin, 1 for stdout, 2 for stderr). If number is not

specified, by default the stdout file descriptor will be used for

writing, stdin for reading.



For example to read from stdin with ffmpeg:



cat test.wav | ffmpeg -i pipe:0

# ...this is the same as...

cat test.wav | ffmpeg -i pipe:



For writing to stdout with ffmpeg:



ffmpeg -i test.wav -f avi pipe:1 | cat > test.avi

# ...this is the same as...

ffmpeg -i test.wav -f avi pipe: | cat > test.avi



Note that some formats (typically MOV), require the output protocol to

be seekable, so they will fail with the pipe output protocol.



rtmp

Real-Time Messaging Protocol.



The Real-Time Messaging Protocol (RTMP) is used for streaming

multimeaXX dia content across a TCP/IP network.



The required syntax is:



rtmp://<server>[:<port>][/<app>][/<playpath>]



The accepted parameters are:



server

The address of the RTMP server.



port

The number of the TCP port to use (by default is 1935).



app It is the name of the application to access. It usually corresponds

to the path where the application is installed on the RTMP server

(e.g. /ondemand/, /flash/live/, etc.).



playpath

It is the path or name of the resource to play with reference to

the application specified in app, may be prefixed by "mp4:".



For example to read with ffplay a multimedia resource named "sample"

from the application "vod" from an RTMP server "myserver":



ffplay rtmp://myserver/vod/sample



rtmp, rtmpe, rtmps, rtmpt, rtmpte

Real-Time Messaging Protocol and its variants supported through

librtmp.



Requires the presence of the librtmp headers and library during

configuration. You need to explicitely configure the build with

"--enable-librtmp". If enabled this will replace the native RTMP

protocol.



This protocol provides most client functions and a few server functions

needed to support RTMP, RTMP tunneled in HTTP (RTMPT), encrypted RTMP

(RTMPE), RTMP over SSL/TLS (RTMPS) and tunneled variants of these

encrypted types (RTMPTE, RTMPTS).



The required syntax is:



<rtmp_proto>://<server>[:<port>][/<app>][/<playpath>] <options>



where rtmp_proto is one of the strings "rtmp", "rtmpt", "rtmpe",

"rtmps", "rtmpte", "rtmpts" corresponding to each RTMP variant, and

server, port, app and playpath have the same meaning as specified for

the RTMP native protocol. options contains a list of space-separated

options of the form key=val.



See the librtmp manual page (man 3 librtmp) for more information.



For example, to stream a file in real-time to an RTMP server using

ffmpeg:



ffmpeg -re -i myfile -f flv rtmp://myserver/live/mystream



To play the same stream using ffplay:



ffplay "rtmp://myserver/live/mystream live=1"

rtp

Real-Time Protocol.



rtsp

RTSP is not technically a protocol handler in libavformat, it is a

demuxer and muxer. The demuxer supports both normal RTSP (with data

transferred over RTP; this is used by e.g. Apple and Microsoft) and

Real-RTSP (with data transferred over RDT).



The muxer can be used to send a stream using RTSP ANNOUNCE to a server

supporting it (currently Darwin Streaming Server and Mischa

Spiegelmock's RTSP server, <http://github.com/revmischa/rtsp-server>).



The required syntax for a RTSP url is:

rtsp://<hostname>[:<port>]/<path>[?<options>]



options is a "&"-separated list. The following options are supported:



udp Use UDP as lower transport protocol.



tcp Use TCP (interleaving within the RTSP control channel) as lower

transport protocol.



multicast

Use UDP multicast as lower transport protocol.



http

Use HTTP tunneling as lower transport protocol, which is useful for

passing proxies.



filter_src

Accept packets only from negotiated peer address and port.



Multiple lower transport protocols may be specified, in that case they

are tried one at a time (if the setup of one fails, the next one is

tried). For the muxer, only the "tcp" and "udp" options are supported.



When receiving data over UDP, the demuxer tries to reorder received

packets (since they may arrive out of order, or packets may get lost

totally). In order for this to be enabled, a maximum delay must be

specified in the "max_delay" field of ***FormatContext.



When watching multi-bitrate Real-RTSP streams with ffplay, the streams

to display can be chosen with "-vst" n and "-ast" n for video and audio

respectively, and can be switched on the fly by pressing "v" and "a".



Example command lines:



To watch a stream over UDP, with a max reordering delay of 0.5 seconds:



ffplay -max_delay 500000 rtsp://server/video.mp4?udp



To watch a stream tunneled over HTTP:



ffplay rtsp://server/video.mp4?http



To send a stream in realtime to a RTSP server, for others to watch:



ffmpeg -re -i <input> -f rtsp -muxdelay 0.1 rtsp://server/live.sdp



sap

Session Announcement Protocol (RFC 2974). This is not technically a

protocol handler in libavformat, it is a muxer and demuxer. It is used

for signalling of RTP streams, by announcing the SDP for the streams

regularly on a separate port.

-------------------------------------------------

Muxer



The syntax for a SAP url given to the muxer is:



sap://<destination>[:<port>][?<options>]



The RTP packets are sent to destination on port port, or to port 5004

if no port is specified. options is a "&"-separated list. The

following options are supported:



announce_addr=address

Specify the destination IP address for sending the announcements

to. If omitted, the announcements are sent to the commonly used

SAP announcement multicast address 224.2.127.254 (sap.mcast.net),

or ff0e::2:7ffe if destination is an IPv6 address.



announce_port=port

Specify the port to send the announcements on, defaults to 9875 if

not specified.



ttl=ttl

Specify the time to live value for the announcements and RTP

packets, defaults to 255.



same_port=0|1

If set to 1, send all RTP streams on the same port pair. If zero

(the default), all streams are sent on unique ports, with each

stream on a port 2 numbers higher than the previous. VLC/Live555

requires this to be set to 1, to be able to receive the stream.

The RTP stack in libavformat for receiving requires all streams to

be sent on unique ports.



Example command lines follow.



To broadcast a stream on the local subnet, for watching in VLC:



ffmpeg -re -i <input> -f sap sap://224.0.0.255?same_port=1



Similarly, for watching in ffplay:



ffmpeg -re -i <input> -f sap sap://224.0.0.255



And for watching in ffplay, over IPv6:



ffmpeg -re -i <input> -f sap sap://[ff0e::1:2:3:4]



Demuxer



The syntax for a SAP url given to the demuxer is:



sap://[<address>][:<port>]



address is the multicast address to listen for announcements on, if

omitted, the default 224.2.127.254 (sap.mcast.net) is used. port is the

port that is listened on, 9875 if omitted.



The demuxers listens for announcements on the given address and port.

Once an announcement is received, it tries to receive that particular

stream.



Example command lines follow.



To play back the first stream announced on the normal SAP multicast

address:



ffplay sap://



To play back the first stream announced on one the default IPv6 SAP

multicast address:



ffplay sap://[ff0e::2:7ffe]



tcp

Trasmission Control Protocol.



udp

User Datagram Protocol.



The required syntax for a UDP url is:



udp://<hostname>:<port>[?<options>]



options contains a list of &-seperated options of the form key=val.

Follow the list of supported options.



buffer_size=size

set the UDP buffer size in bytes



localport=port

override the local UDP port to bind with



pkt_size=size

set the size in bytes of UDP packets



reuse=1|0

explicitly allow or disallow reusing UDP sockets



ttl=ttl

set the time to live value (for multicast only)



connect=1|0

Initialize the UDP socket with "connect()". In this case, the

destination address can't be changed with udp_set_remote_url later.

If the destination address isn't known at the start, this option

can be specified in udp_set_remote_url, too. This allows finding

out the source address for the packets with getsockname, and makes

writes return with ***ERROR(ECONNREFUSED) if "destination

unreachable" is received. For receiving, this gives the benefit of

only receiving packets from the specified peer address/port.



Some usage examples of the udp protocol with ffmpeg follow.



To stream over UDP to a remote endpoint:



ffmpeg -i <input> -f <format> udp://<hostname>:<port>



To stream in mpegts format over UDP using 188 sized UDP packets, using

a large input buffer:



ffmpeg -i <input> -f mpegts udp://<hostname>:<port>?pkt_size=188&buffer_size=65535



To receive over UDP from a remote endpoint:



ffmpeg -i udp://[<multicast-address>]:<port>



-------------------------------------------------

FILTERGRAPH DESCRIPTION

A filtergraph is a directed graph of connected filters. It can contain

cycles, and there can be multiple links between a pair of filters. Each

link has one input pad on one side connecting it to one filter from

which it takes its input, and one output pad on the other side

connecting it to the one filter accepting its output.



Each filter in a filtergraph is an instance of a filter class

registered in the application, which defines the features and the

number of input and output pads of the filter.



A filter with no input pads is called a "source", a filter with no

output pads is called a "sink".



Filtergraph syntax

A filtergraph can be represented using a textual representation, which

is recognized by the "-vf" and "-af" options of the ff* tools, and by

the "av_parse_graph()" function defined in libavfilter/avfiltergraph.



A filterchain consists of a sequence of connected filters, each one

connected to the previous one in the sequence. A filterchain is

represented by a list of ","-separated filter descriptions.



A filtergraph consists of a sequence of filterchains. A sequence of

filterchains is represented by a list of ";"-separated filterchain

descriptions.



A filter is represented by a string of the form:

[in_link_1]...[in_link_N]filter_name=arguments[out_link_1]...[out_link_M]



filter_name is the name of the filter class of which the described

filter is an instance of, and has to be the name of one of the filter

classes registered in the program. The name of the filter class is

optionally followed by a string "=arguments".



arguments is a string which contains the parameters used to initialize

the filter instance, and are described in the filter descriptions

below.



The list of arguments can be quoted using the character "'" as initial

and ending mark, and the character '/' for escaping the characters

within the quoted text; otherwise the argument string is considered

terminated when the next special character (belonging to the set

"[]=;,") is encountered.



The name and arguments of the filter are optionally preceded and

followed by a list of link labels. A link label allows to name a link

and associate it to a filter output or input pad. The preceding labels

in_link_1 ... in_link_N, are associated to the filter input pads, the

following labels out_link_1 ... out_link_M, are associated to the

output pads.



When two link labels with the same name are found in the filtergraph, a

link between the corresponding input and output pad is created.



If an output pad is not labelled, it is linked by default to the first

unlabelled input pad of the next filter in the filterchain. For

example in the filterchain:



nullsrc, split[L1], [L2]overlay, nullsink



the split filter instance has two output pads, and the overlay filter

instance two input pads. The first output pad of split is labelled

"L1", the first input pad of overlay is labelled "L2", and the second

output pad of split is linked to the second input pad of overlay, which

are both unlabelled.



In a complete filterchain all the unlabelled filter input and output

pads must be connected. A filtergraph is considered valid if all the

filter input and output pads of all the filterchains are connected.



Follows a BNF description for the filtergraph syntax:



<NAME> ::= sequence of alphanumeric characters and '_'

<LINKLABEL> ::= "[" <NAME> "]"

<LINKLABELS> ::= <LINKLABEL> [<LINKLABELS>]

<FILTER_ARGUMENTS> ::= sequence of chars (eventually quoted)

<FILTER> ::= [<LINKNAMES>] <NAME> ["=" <ARGUMENTS>] [<LINKNAMES>]

<FILTERCHAIN> ::= <FILTER> [,<FILTERCHAIN>]

<FILTERGRAPH> ::= <FILTERCHAIN> [;<FILTERGRAPH>]

-------------------------------------------------

AUDIO FILTERS

When you configure your FFmpeg build, you can disable any of the

existing filters using --disable-filters. The configure output will

show the audio filters included in your build.



Below is a description of the currently available audio filters.



anull

Pass the audio source unchanged to the output.



AUDIO SOURCES

Below is a description of the currently available audio sources.



anullsrc

Null audio source, never return audio frames. It is mainly useful as a

template and to be employed in analysis / debugging tools.



It accepts as optional parameter a string of the form

sample_rate:channel_layout.



sample_rate specify the sample rate, and defaults to 44100.



channel_layout specify the channel layout, and can be either an integer

or a string representing a channel layout. The default value of

channel_layout is 3, which corresponds to CH_LAYOUT_STEREO.



Check the channel_layout_map definition in libavcodec/audioconvert.c

for the mapping between strings and channel layout values.



Follow some examples:



# set the sample rate to 48000 Hz and the channel layout to CH_LAYOUT_MONO.

anullsrc=48000:4



# same as

anullsrc=48000:mono



AUDIO SINKS

Below is a description of the currently available audio sinks.



anullsink

Null audio sink, do absolutely nothing with the input audio. It is

mainly useful as a template and to be employed in analysis / debugging

tools.



VIDEO FILTERS

When you configure your FFmpeg build, you can disable any of the

existing filters using --disable-filters. The configure output will

show the video filters included in your build.



Below is a description of the currently available video filters.



blackframe

Detect frames that are (almost) completely black. Can be useful to

detect chapter transitions or commercials. Output lines consist of the

frame number of the detected frame, the percentage of blackness, the

position in the file if known or -1 and the timestamp in seconds.



In order to display the output lines, you need to set the loglevel at

least to the ***_LOG_INFO value.



The filter accepts the syntax:



blackframe[=<amount>:[<threshold>]]



amount is the percentage of the pixels that have to be below the

threshold, and defaults to 98.



threshold is the threshold below which a pixel value is considered

black, and defaults to 32.



copy

Copy the input source unchanged to the output. Mainly useful for

testing purposes.



crop

Crop the input video to out_w:out_h:x:y.



The parameters are expressions containing the following constants:



E, PI, PHI

the corresponding mathematical approximated values for e (euler

number), pi (greek PI), PHI (golden ratio)



x, y

the computed values for x and y. They are evaluated for each new

frame.



in_w, in_h

the input width and heigth



iw, ih

same as in_w and in_h



out_w, out_h

the output (cropped) width and heigth



ow, oh

same as out_w and out_h



n the number of input frame, starting from 0



pos the position in the file of the input frame, NAN if unknown



t timestamp expressed in seconds, NAN if the input timestamp is

unknown



The out_w and out_h parameters specify the expressions for the width

and height of the output (cropped) video. They are evaluated just at

the configuration of the filter.



The default value of out_w is "in_w", and the default value of out_h is

"in_h".



The expression for out_w may depend on the value of out_h, and the

expression for out_h may depend on out_w, but they cannot depend on x

and y, as x and y are evaluated after out_w and out_h.



The x and y parameters specify the expressions for the position of the

top-left corner of the output (non-cropped) area. They are evaluated

for each frame. If the evaluated value is not valid, it is approximated

to the nearest valid value.



The default value of x is "(in_w-out_w)/2", and the default value for y

is "(in_h-out_h)/2", which set the cropped area at the center of the

input image.



The expression for x may depend on y, and the expression for y may

depend on x.



Follow some examples:



# crop the central input area with size 100x100

crop=100:100



# crop the central input area with size 2/3 of the input video

"crop=2/3*in_w:2/3*in_h"



# crop the input video central square

crop=in_h



# delimit the rectangle with the top-left corner placed at position

# 100:100 and the right-bottom corner corresponding to the right-bottom

# corner of the input image.

crop=in_w-100:in_h-100:100:100



# crop 10 pixels from the lefth and right borders, and 20 pixels from

# the top and bottom borders

"crop=in_w-2*10:in_h-2*20"



# keep only the bottom right quarter of the input image

"crop=in_w/2:in_h/2:in_w/2:in_h/2"



# crop height for getting Greek harmony

"crop=in_w:1/PHI*in_w"



# trembling effect

"crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)"



# erratic camera effect depending on timestamp and position

"crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(t*10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t*13)"



# set x depending on the value of y

"crop=in_w/2:in_h/2:y:10+10*sin(n/10)"



cropdetect

Auto-detect crop size.



Calculate necessary cropping parameters and prints the recommended

parameters through the logging system. The detected dimensions

correspond to the non-black area of the input video.



It accepts the syntax:



cropdetect[=<limit>[:<round>[:<reset>]]]



limit

Threshold, which can be optionally specified from nothing (0) to

everything (255), defaults to 24.



round

Value which the width/height should be divisible by, defaults to

16. The offset is automatically adjusted to center the video. Use 2

to get only even dimensions (needed for 4:2:2 video). 16 is best

when encoding to most video codecs.



reset

Counter that determines after how many frames cropdetect will reset

the previously detected largest video area and start over to detect

the current optimal crop area. Defaults to 0.



This can be useful when channel logos distort the video area. 0

indicates never reset and return the largest area encountered

during playback.



drawbox

Draw a colored box on the input image.



It accepts the syntax:



drawbox=<x>:<y>:<width>:<height>:<color>



x, y

Specify the top left corner coordinates of the box. Default to 0.



width, height

Specify the width and height of the box, if 0 they are interpreted

as the input width and height. Default to 0.



color

Specify the color of the box to write, it can be the name of a

color (case insensitive match) or a 0xRRGGBB[AA] sequence.



Follow some examples:



# draw a black box around the edge of the input image

drawbox



# draw a box with color red and an opacity of 50%

drawbox=10:20:200:60:red@0.5"



fifo

Buffer input images and send them when they are requested.



This filter is mainly useful when auto-inserted by the libavfilter

framework.



The filter does not take parameters.



format

Convert the input video to one of the specified pixel formats.

Libavfilter will try to pick one that is supported for the input to the

next filter.



The filter accepts a list of pixel format names, separated by ":", for

example "yuv420p:monow:rgb24".



Some examples follow:



# convert the input video to the format "yuv420p"

format=yuv420p



# convert the input video to any of the formats in the list

format=yuv420p:yuv444p:yuv410p



frei0r

Apply a frei0r effect to the input video.



To enable compilation of this filter you need to install the frei0r

header and configure FFmpeg with --enable-frei0r.



The filter supports the syntax:



<filter_name>[{:|=}<param1>:<param2>:...:<paramN>]



filter_name is the name to the frei0r effect to load. If the

environment variable FREI0R_PATH is defined, the frei0r effect is

searched in each one of the directories specified by the colon

separated list in FREIOR_PATH, otherwise in the standard frei0r paths,

which are in this order: HOME/.frei0r-1/lib/, /usr/local/lib/frei0r-1/,

/usr/lib/frei0r-1/.



param1, param2, ... , paramN specify the parameters for the frei0r

effect.



A frei0r effect parameter can be a boolean (whose values are specified

with "y" and "n"), a double, a color (specified by the syntax R/G/B, R,

G, and B being float numbers from 0.0 to 1.0) or by an

"av_parse_color()" color description), a position (specified by the

syntax X/Y, X and Y being float numbers) and a string.



The number and kind of parameters depend on the loaded effect. If an

effect parameter is not specified the default value is set.



Some examples follow:



# apply the distort0r effect, set the first two double parameters

frei0r=distort0r:0.5:0.01



# apply the colordistance effect, takes a color as first parameter

frei0r=colordistance:0.2/0.3/0.4

frei0r=colordistance:violet

frei0r=colordistance:0x112233



# apply the perspective effect, specify the top left and top right

# image positions

frei0r=perspective:0.2/0.2:0.8/0.2



For more information see: <http://piksel.org/frei0r>



gradfun

Fix the banding artifacts that are sometimes introduced into nearly

flat regions by truncation to 8bit colordepth. Interpolate the

gradients that should go where the bands are, and dither them.



The filter takes two optional parameters, separated by ':':

strength:radius



strength is the maximum amount by which the filter will change any one

pixel. Also the threshold for detecting nearly flat regions. Acceptable

values range from .51 to 255, default value is 1.2, out-of-range values

will be clipped to the valid range.



radius is the neighborhood to fit the gradient to. A larger radius

makes for smoother gradients, but also prevents the filter from

modifying the pixels near detailed regions. Acceptable values are 8-32,

default value is 16, out-of-range values will be clipped to the valid

range.



# default parameters

gradfun=1.2:16



# omitting radius

gradfun=1.2



hflip

Flip the input video horizontally.



For example to horizontally flip the video in input with ffmpeg:



ffmpeg -i in.avi -vf "hflip" out.avi



hqdn3d

High precision/quality 3d denoise filter. This filter aims to reduce

image noise producing smooth images and making still images really

still. It should enhance compressibility.



It accepts the following optional parameters:

luma_spatial:chroma_spatial:luma_tmp:chroma_tmp



luma_spatial

a non-negative float number which specifies spatial luma strength,

defaults to 4.0



chroma_spatial

a non-negative float number which specifies spatial chroma

strength, defaults to 3.0*luma_spatial/4.0



luma_tmp

a float number which specifies luma temporal strength, defaults to

6.0*luma_spatial/4.0



chroma_tmp

a float number which specifies chroma temporal strength, defaults

to luma_tmp*chroma_spatial/luma_spatial



noformat

Force libavfilter not to use any of the specified pixel formats for the

input to the next filter.



The filter accepts a list of pixel format names, separated by ":", for

example "yuv420p:monow:rgb24".



Some examples follow:



# force libavfilter to use a format different from "yuv420p" for the

# input to the vflip filter

noformat=yuv420p,vflip



# convert the input video to any of the formats not contained in the list

noformat=yuv420p:yuv444p:yuv410p



null

Pass the video source unchanged to the output.



ocv

Apply video transform using libopencv.



To enable this filter install libopencv library and headers and

configure FFmpeg with --enable-libopencv.



The filter takes the parameters: filter_name{:=}filter_params.



filter_name is the name of the libopencv filter to apply.



filter_params specifies the parameters to pass to the libopencv filter.

If not specified the default values are assumed.



Refer to the official libopencv documentation for more precise

informations:

<http://opencv.willowgarage.com/documentation/c/image_filtering.html>



Follows the list of supported libopencv filters.



dilate



Dilate an image by using a specific structuring element. This filter

corresponds to the libopencv function "cvDilate".



It accepts the parameters: struct_el:nb_iterations.



struct_el represents a structuring element, and has the syntax:

colsxrows+anchor_xxanchor_y/shape



cols and rows represent the number of colums and rows of the

structuring element, anchor_x and anchor_y the anchor point, and shape

the shape for the structuring element, and can be one of the values

"rect", "cross", "ellipse", "custom".



If the value for shape is "custom", it must be followed by a string of

the form "=filename". The file with name filename is assumed to

represent a binary image, with each printable character corresponding

to a bright pixel. When a custom shape is used, cols and rows are

ignored, the number or columns and rows of the read file are assumed

instead.



The default value for struct_el is "3x3+0x0/rect".



nb_iterations specifies the number of times the transform is applied to

the image, and defaults to 1.



Follow some example:



# use the default values

ocv=dilate



# dilate using a structuring element with a 5x5 cross, iterate two times

ocv=dilate=5x5+2x2/cross:2



# read the shape from the file diamond.shape, iterate two times

# the file diamond.shape may contain a pattern of characters like this:

# *

# ***

# *****

# ***

# *

# the specified cols and rows are ignored (but not the anchor point coordinates)

ocv=0x0+2x2/custom=diamond.shape:2



erode



Erode an image by using a specific structuring element. This filter

corresponds to the libopencv function "cvErode".



The filter accepts the parameters: struct_el:nb_iterations, with the

same meaning and use of those of the dilate filter.

-------------------------------------------------

smooth



Smooth the input video.



The filter takes the following parameters:

type:param1:param2:param3:param4.



type is the type of smooth filter to apply, and can be one of the

following values: "blur", "blur_no_scale", "median", "gaussian",

"bilateral". The default value is "gaussian".



param1, param2, param3, and param4 are parameters whose meanings depend

on smooth type. param1 and param2 accept integer positive values or 0,

param3 and param4 accept float values.



The default value for param1 is 3, the default value for the other

parameters is 0.



These parameters correspond to the parameters assigned to the libopencv

function "cvSmooth".

-------------------------------------------------

overlay

Overlay one video on top of another.



It takes two inputs and one output, the first input is the "main" video

on which the second input is overlayed.



It accepts the parameters: x:y.



x is the x coordinate of the overlayed video on the main video, y is

the y coordinate. The parameters are expressions containing the

following parameters:



main_w, main_h

main input width and height



W, H

same as main_w and main_h



overlay_w, overlay_h

overlay input width and height



w, h

same as overlay_w and overlay_h



Be aware that frames are taken from each input video in timestamp

order, hence, if their initial timestamps differ, it is a a good idea

to pass the two inputs through a setpts=PTS-STARTPTS filter to have

them begin in the same zero timestamp, as it does the example for the

movie filter.



Follow some examples:



# draw the overlay at 10 pixels from the bottom right

# corner of the main video.

overlay=main_w-overlay_w-10:main_h-overlay_h-10



# insert a transparent PNG logo in the bottom left corner of the input

movie=0:png:logo.png [logo];

[in][logo] overlay=10:main_h-overlay_h-10 [out]



# insert 2 different transparent PNG logos (second logo on bottom

# right corner):

movie=0:png:logo1.png [logo1];

movie=0:png:logo2.png [logo2];

[in][logo1] overlay=10:H-h-10 [in+logo1];

[in+logo1][logo2] overlay=W-w-10:H-h-10 [out]



# add a transparent color layer on top of the main video,

# WxH specifies the size of the main input to the overlay filter

color=red.3:WxH [over]; [in][over] overlay [out]



You can chain togheter more overlays but the efficiency of such

approach is yet to be tested.

-------------------------------------------------

pad

Add paddings to the input image, and places the original input at the

given coordinates x, y.



It accepts the following parameters: width:height:x:y:color.



Follows the description of the accepted parameters.



width, height

Specify the size of the output image with the paddings added. If

the value for width or height is 0, the corresponding input size is

used for the output.



The default value of width and height is 0.



x, y

Specify the offsets where to place the input image in the padded

area with respect to the top/left border of the output image.



The default value of x and y is 0.



color

Specify the color of the padded area, it can be the name of a color

(case insensitive match) or a 0xRRGGBB[AA] sequence.



The default value of color is "black".



For example:



# Add paddings with color "violet" to the input video. Output video

# size is 640x480, the top-left corner of the input video is placed at

# row 0, column 40.

pad=640:480:0:40:violet



pixdesctest

Pixel format descriptor test filter, mainly useful for internal

testing. The output video should be equal to the input video.



For example:



format=monow, pixdesctest



can be used to test the monowhite pixel format descriptor definition.



scale

Scale the input video to width:height and/or convert the image format.



For example the command:



./ffmpeg -i in.avi -vf "scale=200:100" out.avi



will scale the input video to a size of 200x100.



If the input image format is different from the format requested by the

next filter, the scale filter will convert the input to the requested

format.



If the value for width or height is 0, the respective input size is

used for the output.



If the value for width or height is -1, the scale filter will use, for

the respective output size, a value that maintains the aspect ratio of

the input image.



The default value of width and height is 0.



setpts

Change the PTS (presentation timestamp) of the input video frames.



Accept in input an expression evaluated through the eval API, which can

contain the following constants:



PTS the presentation timestamp in input



PI Greek PI



PHI golden ratio



E Euler number



N the count of the input frame, starting from 0.



STARTPTS

the PTS of the first video frame



INTERLACED

tell if the current frame is interlaced



POS original position in the file of the frame, or undefined if

undefined for the current frame



PREV_INPTS

previous input PTS



PREV_OUTPTS

previous output PTS



Some examples follow:



# start counting PTS from zero

setpts=PTS-STARTPTS



# fast motion

setpts=0.5*PTS



# slow motion

setpts=2.0*PTS



# fixed rate 25 fps

setpts=N/(25*TB)



# fixed rate 25 fps with some jitter

setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'



settb

Set the timebase to use for the output frames timestamps. It is mainly

useful for testing timebase configuration.



It accepts in input an arithmetic expression representing a rational.

The expression can contain the constants "PI", "E", "PHI", "***TB" (the

default timebase), and "intb" (the input timebase).



The default value for the input is "intb".



Follow some examples.



# set the timebase to 1/25

settb=1/25



# set the timebase to 1/10

settb=0.1



#set the timebase to 1001/1000

settb=1+0.001



#set the timebase to 2*intb

settb=2*intb



#set the default timebase value

settb=***TB



slicify

Pass the images of input video on to next video filter as multiple

slices.



./ffmpeg -i in.avi -vf "slicify=32" out.avi



The filter accepts the slice height as parameter. If the parameter is

not specified it will use the default value of 16.



Adding this in the beginning of filter chains should make filtering

faster due to better use of the memory cache.

-------------------------------------------------

transpose

Transpose rows with columns in the input video and optionally flip it.



It accepts a parameter representing an integer, which can assume the

values:



0 Rotate by 90 degrees counterclockwise and vertically flip

(default), that is:



L.R L.l

. . -> . .

l.r R.r



1 Rotate by 90 degrees clockwise, that is:



L.R l.L

. . -> . .

l.r r.R



2 Rotate by 90 degrees counterclockwise, that is:



L.R R.r

. . -> . .

l.r L.l



3 Rotate by 90 degrees clockwise and vertically flip, that is:



L.R r.R

. . -> . .

l.r l.L

-------------------------------------------------

unsharp

Sharpen or blur the input video.



It accepts the following parameters:

luma_msize_x:luma_msize_y:luma_amount:chroma_msize_x:chroma_msize_y:chroma_amount



Negative values for the amount will blur the input video, while

positive values will sharpen. All parameters are optional and default

to the equivalent of the string '5:5:1.0:0:0:0.0'.



luma_msize_x

Set the luma matrix horizontal size. It can be an integer between 3

and 13, default value is 5.



luma_msize_y

Set the luma matrix vertical size. It can be an integer between 3

and 13, default value is 5.



luma_amount

Set the luma effect strength. It can be a float number between -2.0

and 5.0, default value is 1.0.



chroma_msize_x

Set the chroma matrix horizontal size. It can be an integer between

3 and 13, default value is 0.



chroma_msize_y

Set the chroma matrix vertical size. It can be an integer between 3

and 13, default value is 0.



luma_amount

Set the chroma effect strength. It can be a float number between

-2.0 and 5.0, default value is 0.0.



# Strong luma sharpen effect parameters

unsharp=7:7:2.5



# Strong blur of both luma and chroma parameters

unsharp=7:7:-2:7:7:-2



# Use the default values with B<ffmpeg>

./ffmpeg -i in.avi -vf "unsharp" out.mp4



vflip

Flip the input video vertically.



./ffmpeg -i in.avi -vf "vflip" out.avi



yadif

Deinterlace the input video ("yadif" means "yet another deinterlacing

filter").



It accepts the optional parameters: mode:parity.



mode specifies the interlacing mode to adopt, accepts one of the

following values:



0 output 1 frame for each frame



1 output 1 frame for each field



2 like 0 but skips spatial interlacing check



3 like 1 but skips spatial interlacing check



Default value is 0.



parity specifies the picture field parity assumed for the input

interlaced video, accepts one of the following values:



0 assume bottom field first



1 assume top field first



-1 enable automatic detection



Default value is -1.

-------------------------------------------------

VIDEO SOURCES

Below is a description of the currently available video sources.



buffer

Buffer video frames, and make them available to the filter chain.



This source is mainly intended for a programmatic use, in particular

through the interface defined in libavfilter/vsrc_buffer.h.



It accepts the following parameters:

width:height:pix_fmt_string:timebase_num:timebase_den



All the parameters need to be explicitely defined.



Follows the list of the accepted parameters.



width, height

Specify the width and height of the buffered video frames.



pix_fmt_string

A string representing the pixel format of the buffered video

frames. It may be a number corresponding to a pixel format, or a

pixel format name.



timebase_num, timebase_den

Specify numerator and denomitor of the timebase assumed by the

timestamps of the buffered frames.



For example:



buffer=320:240:yuv410p:1:24



will instruct the source to accept video frames with size 320x240 and

with format "yuv410p" and assuming 1/24 as the timestamps timebase.

Since the pixel format with name "yuv410p" corresponds to the number 6

(check the enum PixelFormat definition in libavutil/pixfmt.h), this

example corresponds to:



buffer=320:240:6:1:24



color

Provide an uniformly colored input.



It accepts the following parameters: color:frame_size:frame_rate



Follows the description of the accepted parameters.



color

Specify the color of the source. It can be the name of a color

(case insensitive match) or a 0xRRGGBB[AA] sequence, possibly

followed by an alpha specifier. The default value is "black".



frame_size

Specify the size of the sourced video, it may be a string of the

form widthxheigth, or the name of a size abbreviation. The default

value is "320x240".



frame_rate

Specify the frame rate of the sourced video, as the number of

frames generated per second. It has to be a string in the format

frame_rate_num/frame_rate_den, an integer number, a float number or

a valid video frame rate abbreviation. The default value is "25".



For example the following graph description will generate a red source

with an opacity of 0.2, with size "qcif" and a frame rate of 10 frames

per second, which will be overlayed over the source connected to the

pad with identifier "in".



"color=red@0.2:qcif:10 [color]; [in][color] overlay [out]"



nullsrc

Null video source, never return images. It is mainly useful as a

template and to be employed in analysis / debugging tools.



It accepts as optional parameter a string of the form

width:height:timebase.



width and height specify the size of the configured source. The default

values of width and height are respectively 352 and 288 (corresponding

to the CIF size format).



timebase specifies an arithmetic expression representing a timebase.

The expression can contain the constants "PI", "E", "PHI", "***TB" (the

default timebase), and defaults to the value "***TB".



frei0r_src

Provide a frei0r source.



To enable compilation of this filter you need to install the frei0r

header and configure FFmpeg with --enable-frei0r.



The source supports the syntax:



<size>:<rate>:<src_name>[{=|:}<param1>:<param2>:...:<paramN>]



size is the size of the video to generate, may be a string of the form

widthxheight or a frame size abbreviation. rate is the rate of the

video to generate, may be a string of the form num/den or a frame rate

abbreviation. src_name is the name to the frei0r source to load. For

more information regarding frei0r and how to set the parameters read

the section "frei0r" in the description of the video filters.



Some examples follow:



# generate a frei0r partik0l source with size 200x200 and framerate 10

# which is overlayed on the overlay filter main input

frei0r_src=200x200:10:partik0l=1234 [overlay]; [in][overlay] overlay

-------------------------------------------------

VIDEO SINKS

Below is a description of the currently available video sinks.



nullsink

Null video sink, do absolutely nothing with the input video. It is

mainly useful as a template and to be employed in analysis / debugging

tools.



SEE ALSO

ffmpeg(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation



AUTHORS

The FFmpeg developers







2011-01-08 FFPLAY(1)



======================================================





root@ubuntu:/home/zhangbin/Documents/ffmpeg# ls

Changelog configure ffmpeg.o ffserver libavutil

cmdutils.c COPYING.GPLv2 ffplay ffserver.c libpostproc

cmdutils_common_opts.h COPYING.GPLv3 ffplay.c ffserver.d libswscale

cmdutils.d COPYING.LGPLv2.1 ffplay.d ffserver_g LICENSE

cmdutils.h COPYING.LGPLv3 ffplay_g ffserver.h MAINTAINERS

cmdutils.o CREDITS ffplay.o ffserver.o Makefile

common.mak doc ffpresets INSTALL README

config.asm Doxyfile ffprobe libavcodec subdir.mak

config.fate ffmpeg ffprobe.c libavcore tests

config.h ffmpeg.c ffprobe.d libavdevice tools

config.log ffmpeg.d ffprobe_g libavfilter version.h

config.mak ffmpeg_g ffprobe.o libavformat version.sh





===================================fflay播放影片的时候,部分信息=============================



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Seek to 57% ( 0:24:21) of total duration ( 0:42:37)

Seek to 57% ( 0:24:21) of total duration ( 0:42:37)

^C91.60 A-V: 0.003 s:0.0 aq= 320KB vq= 2700KB sq= 0B f=0/0

root@ubuntu:/home/zhangbin/Documents/ffmpeg# ls/

> ^V^C

root@ubuntu:/home/zhangbin/Documents/ffmpeg# ls

Changelog configure ffmpeg.o ffserver libavutil

cmdutils.c COPYING.GPLv2 ffplay ffserver.c libpostproc

cmdutils_common_opts.h COPYING.GPLv3 ffplay.c ffserver.d libswscale

cmdutils.d COPYING.LGPLv2.1 ffplay.d ffserver_g LICENSE

cmdutils.h COPYING.LGPLv3 ffplay_g ffserver.h MAINTAINERS

cmdutils.o CREDITS ffplay.o ffserver.o Makefile

common.mak doc ffpresets INSTALL README

config.asm Doxyfile ffprobe libavcodec subdir.mak

config.fate ffmpeg ffprobe.c libavcore tests

config.h ffmpeg.c ffprobe.d libavdevice tools

config.log ffmpeg.d ffprobe_g libavfilter version.h

config.mak ffmpeg_g ffprobe.o libavformat version.sh

root@ubuntu:/home/zhangbin/Documents/ffmpeg# ./ffplay_g /home/zhangbin/oldboy.mp4

FFplay version SVN-r26268, Copyright (c) 2003-2011 the FFmpeg developers

built on Jan 8 2011 09:20:02 with gcc 4.4.3

configuration: --enable-shared --enable-gpl --enable-nonfree --enable-pthreads --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libxvid --enable-x11grab --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrnb --enable-version3

libavutil 50.36. 0 / 50.36. 0

libavcore 0.16. 0 / 0.16. 0

libavcodec 52.107. 0 / 52.107. 0

libavformat 52.92. 0 / 52.92. 0

libavdevice 52. 2. 3 / 52. 2. 3

libavfilter 1.72. 0 / 1.72. 0

libswscale 0.12. 0 / 0.12. 0

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/zhangbin/oldboy.mp4':

Metadata:

major_brand : isom

minor_version : 1

compatible_brands: isom

creation_time : 2010-10-31 03:36:12

Duration: 00:42:37.76, start: 0.000000, bitrate: 506 kb/s

Stream #0.0(und): Video: h264, yuv420p, 672x378 [PAR 1:1 DAR 16:9], 471 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc

Metadata:

creation_time : 2010-10-26 15:52:54

Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 31 kb/s

Metadata:

creation_time : 2010-10-31 03:36:14

Seek to 53% ( 0:22:38) of total duration ( 0:42:37) f=0/0 f=0/0

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Seek to 79% ( 0:33:48) of total duration ( 0:42:37) f=0/0

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Seek to 79% ( 0:33:48) of total duration ( 0:42:37) f=0/0

Seek to 79% ( 0:33:48) of total duration ( 0:42:37)

Seek to 74% ( 0:31:38) of total duration ( 0:42:37) f=0/0

Seek to 74% ( 0:31:34) of total duration ( 0:42:37) f=0/0

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Seek to 66% ( 0:28:17) of total duration ( 0:42:37) f=0/0

Seek to 66% ( 0:28:17) of total duration ( 0:42:37) f=0/0

Seek to 66% ( 0:28:17) of total duration ( 0:42:37)

Seek to 66% ( 0:28:17) of total duration ( 0:42:37)

Seek to 66% ( 0:28:17) of total duration ( 0:42:37) f=0/0

Seek to 66% ( 0:28:17) of total duration ( 0:42:37)

1698.47 A-V: 0.030 s:0.0 aq= 320KB vq= 3760KB sq= 0B f=0/0

========================
指定了长宽比的播放

root@ubuntu:/home/zhangbin/Documents/ffmpeg# ./ffplay_g -x 200 -y 400 /home/zhangbin/oldboy.mp4
FFplay version SVN-r26268, Copyright (c) 2003-2011 the FFmpeg developers
built on Jan 8 2011 09:20:02 with gcc 4.4.3
configuration: --enable-shared --enable-gpl --enable-nonfree --enable-pthreads --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libxvid --enable-x11grab --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrnb --enable-version3
libavutil 50.36. 0 / 50.36. 0
libavcore 0.16. 0 / 0.16. 0
libavcodec 52.107. 0 / 52.107. 0
libavformat 52.92. 0 / 52.92. 0
libavdevice 52. 2. 3 / 52. 2. 3
libavfilter 1.72. 0 / 1.72. 0
libswscale 0.12. 0 / 0.12. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/zhangbin/oldboy.mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isom
creation_time : 2010-10-31 03:36:12
Duration: 00:42:37.76, start: 0.000000, bitrate: 506 kb/s
Stream #0.0(und): Video: h264, yuv420p, 672x378 [PAR 1:1 DAR 16:9], 471 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
Metadata:
creation_time : 2010-10-26 15:52:54
Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 31 kb/s
Metadata:
creation_time : 2010-10-31 03:36:14
12.46 A-V: 0.017 s:0.0 aq= 319KB vq= 3365KB sq= 0B f=0/0 f=0/0

================================================

qq截图，是不能把后面的播放窗口截出来的。

ffplay和DLP的 播放窗口 都是这个样子的。

播放一切正常，鼠标的滚轮还可以滑动 ，这时候seek的表现一切正常。