Streaming Live H264 Video Over RTP

[Mailing List SVR]

Il 04/08/2011 16:54, William Metcalf ha scritto:
> I am streaming live H264 video from an application in Windows (the 
> input is from a capture card) as follows
>
> appsrc is-live=true do-timestamp=false typefind=true ! 
> "video/x-raw-yuv,format=(fourcc)UYVY,width=(int)720,height=(int)486,framerate=(fraction)30/1" 
> ! ffmpegcolorspace ! x264enc byte-stream=true ! h264parse ! rtph264pay 
> ! udpsink clients="192.168.42.45:52000"
>

try to set the encoding quality on the x264enc element

> In order to receive the stream I use the following pipeline
>
> gst-launch -v udpsrc port=52000 ! 
> "application/x-rtp,media=(string)video,clock-rate=90000,encoding-type=(string)H264,payload=(int)96" 
> ! rtph264depay ! 
> "video/x-h264,width=(int)720,height=(int)486,framerate=(fraction)30/1" 
> ! ffdec_h264 ! ffmpegcolorspace ! glimagesink sync=false
>
> The video produced plays fine (i.e. the framerate and all of the 
> colors seem correct), but the video is of very very low quality and is 
> very pixelated.  If I change the "do-timestamp" property of appsrc to 
> true, the video becomes very clear and very high quality, but the 
> video plays very jumpy and I get the following errors repeatedly:
>
> 0:00:04.949494000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> Missing reference picture
> 0:00:04.956495000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> decode_slice_header error
> 0:00:05.045504000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> reference picture missing during reorder
> 0:00:05.059505000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> reference picture missing during reorder
> 0:00:05.073507000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> reference picture missing during reorder
> 0:00:05.087508000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> reference picture missing during reorder
> 0:00:05.104510000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> Missing reference picture
> 0:00:05.119511000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> decode_slice_header error
> 0:00:05.148514000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> mmco: unref short failure
> 0:00:05.168516000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> mmco: unref short failure
> 0:00:05.183518000  2680   0185E490 ERROR                 ffmpeg .:0:: 
> Missing reference picture
>
> I am sure these errors are because of some setting that I am missing 
> or setting to a wrong value, but so far I have not been able to find a 
> good solution.  Can anyone offer some insight on how to fix this 
> problem?  Any help is greatly appreciated.
>
> Thank you,
> William
>
>
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