使用GStreamer作v4l2摄像头采集和输出到YUV文件及屏幕的相关测试

环境：ubuntu 9.10

安装软件：gstreamer 基本包 以及gst-plug-ins-bad， mplayer

1、使用mplayer播放yuv文件

shallon@shallon-desktop:~/yuv_play_test_from_hp$ mplayer test.yuv1 -demuxer rawvideo -rawvideo w=352:h=288

MPlayer SVN-r29237-4.4.1 (C) 2000-2009 MPlayer Team

mplayer: could not connect to socket

mplayer: No such file or directory

Failed to open LIRC support. You will not be able to use your remote control.

Playing test.yuv1.

rawvideo file format detected.

open: No such file or directory

[MGA] Couldn't open: /dev/mga_vid

open: No such file or directory

[MGA] Couldn't open: /dev/mga_vid

[VO_TDFXFB] Can't open /dev/fb0: No such file or directory.

[VO_3DFX] Unable to open /dev/3dfx.

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

Opening video decoder: [raw] RAW Uncompressed Video

VDec: vo config request - 352 x 288 (preferred colorspace: Planar I420)

VDec: using Planar I420 as output csp (no 0)

Movie-Aspect is undefined - no prescaling applied.

VO: [xv] 352x288 => 352x288 Planar I420

Selected video codec: [rawi420] vfm: raw (RAW I420)

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

Audio: no sound

Starting playback...

V: 1.0 26/ 26 0% 4% 0.0% 0 0

Exiting... (End of file)

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2、v4l2 摄像头采集并输出到屏幕



shallon@shallon-desktop:~/yuv_play_test_from_hp$ gst-launch-0.10 v4l2src ! video/x-raw-yuv,width=352,height=288 ! xvimagesink

(gst-launch-0.10:13429): GLib-WARNING **: g_set_prgname() called multiple times

设置暂停管道 ...

管道正在使用且不需要 PREROLL ...

设置播放管道 ...

New clock: GstSystemClock

^CCaught interrupt -- handling interrupt.

中断：停止流水线作业...

Execution ended after 5775814760 ns.

设置暂停管道 ...

正在完成设置管道 ...

正在设置管道为 NULL ...

释放管道资源 ...

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

3、v4l2 摄像头采集并输出到yuv文件



gst-launch-0.10 v4l2src ! ffmpegcolorspace ! video/x-raw-yuv, format=/(fourcc/)I420, width=352,height=288 ! filesink location=v4l2.yuv1

shallon@shallon-desktop:~$ gst-launch-0.10 v4l2src ! ffmpegcolorspace ! video/x-raw-yuv, format=/(fourcc/)I420, width=352,height=288 ! filesink location=v4l2.yuv1

(gst-launch-0.10:2152): GLib-WARNING **: g_set_prgname() called multiple times

设置暂停管道 ...

管道正在使用且不需要 PREROLL ...

设置播放管道 ...

New clock: GstSystemClock

^CCaught interrupt -- handling interrupt.

中断：停止流水线作业...

Execution ended after 6094593351 ns.

设置暂停管道 ...

正在完成设置管道 ...

正在设置管道为 NULL ...

释放管道资源 ...

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

4、使用gstreamer 将yuv文件读出并显示到屏幕上



shallon@shallon-desktop:~$ gst-launch-0.10 filesrc location=v4l2.yuv1 ! videoparse width=352 height=288 ! xvimagesink

(gst-launch-0.10:2521): GLib-WARNING **: g_set_prgname() called multiple times

设置暂停管道 ...

管道正在 PREROLLING ...

管道预读完成 ...

设置播放管道 ...

New clock: GstSystemClock

收到来自组件“pipeline0”的 EOS 信号。

Execution ended after 4480103264 ns.

设置暂停管道 ...

正在完成设置管道 ...

正在设置管道为 NULL ...

释放管道资源 ...