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ffmpeg参数详细解释(源自ffmpeg.c)

2009-09-28 09:40 399 查看

main options
L	show license
h	show help
version	show version
formats	show available formats codecs protocols …
f	force format
i	input file name
y	overwrite output files
map	set input stream mapping
map_meta_data	set meta data information of outfile from infile
t	record or transcode /"duration/seconds of audio/video
fs	set the limit file size in bytes
ss	set the start time offset
itsoffset	set the input ts offset
itsscale	set the input ts scale
timestamp	set the timestamp ('now' to set the current time)
metadata	add metadata
dframes	set the number of data frames to record
benchmark
dump
hex
re	read input at native frame rate
loop_input	loop (current only works with images)
loop_output	number of times to loop output in formats that support looping (0 loops forever)
v	set ffmpeg verbosity level
loglevel	set libav* logging level
target	specify target file type (/"vcd/ /"svcd/ /"dvd/ /"dv/ /"dv50/ /"pal-vcd/ /"ntsc-svcd/ ...)
threads	thread count
vsync	video sync method
async	audio sync method
adrift_threshold	audio drift threshold
vglobal	video global header storage type
copyts	copy timestamps
shortest	finish encoding within shortest input
dts_delta_threshold	timestamp discontinuity delta threshold
programid	desired program number
xerror	exit on error
copyinkf	copy initial non-keyframes

video options
b	set bitrate (in bits/s)
vb	set bitrate (in bits/s)
vframes	set the number of video frames to record
r	set frame rate (Hz value fraction or abbreviation)
s	set frame size (WxH or abbreviation)
aspect	set aspect ratio (4:3 16:9 or 1.3333 1.7777)
pix_fmt	set pixel format 'list' as argument shows all the pixel formats supported
croptop	set top crop band size (in pixels)
cropbottom	set bottom crop band size (in pixels)
cropleft	set left crop band size (in pixels)
cropright	set right crop band size (in pixels)
padtop	set top pad band size (in pixels)
padbottom	set bottom pad band size (in pixels)
padleft	set left pad band size (in pixels)
padright	set right pad band size (in pixels)
padcolor	set color of pad bands (Hex 000000 thru FFFFFF)
intra	use only intra frames"
vn	disable video
vdt	discard threshold
qscale	use fixed video quantizer scale (VBR)
rc_override	rate control override for specific intervals
vcodec	force video codec ('copy' to copy stream)
me_threshold	motion estimaton threshold
sameq
pass	select the pass number (1 or 2)
passlogfile	select two pass log file name prefix
deinterlace
psnr	calculate PSNR of compressed frames
vstats	dump video coding statistics to file
vstats_file	dump video coding statistics to file
intra_matrix	specify intra matrix coeffs
inter_matrix	specify inter matrix coeffs
top	top=1/bottom=0/auto=-1 field first
dc	intra_dc_precision
vtag	force video tag/fourcc
newvideo	add a new video stream to the current output stream
qphist
force_fps	force the selected framerate disable the best supported framerate selection

audio options
ab	set bitrate (in bits/s)
aframes	set the number of audio frames to record
aq	set audio quality (codec-specific)
ar	set audio sampling rate (in Hz)
ac	set number of audio channels
an	disable audio
acodec	force audio codec ('copy' to copy stream)
atag	force audio tag/fourcc
vol	change audio volume (256=normal)
newaudio	add a new audio stream to the current output stream
alang	set the ISO 639 language code (3 letters) of the current audio stream
sample_fmt	set sample format 'list' as argument shows all the sample formats supported

subtitle options
sn	disable subtitle
scodec	force subtitle codec ('copy' to copy stream)
newsubtitle	add a new subtitle stream to the current output stream
slang	set the ISO 639 language code (3 letters) of the current subtitle stream
stag	force subtitle tag/fourcc

grab options
vc	set video grab channel (DV1394 only)
tvstd	set television standard (NTSC PAL (SECAM))
isync	sync read on input

muxer options
muxdelay	set the maximum demux-decode delay
muxpreload	set the initial demux-decode delay
absf
vbsf
sbsf
apre	set the audio options to the indicated preset
vpre	set the video options to the indicated preset
spre	set the subtitle options to the indicated preset
default	generic catch all option

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