[gst-devel] How can I synchronize video and audio

[Stefan Kost]

Zelalem Sintayehu schrieb:
> Hi guys, I wanted to record video coming from network into avi file,
> and wrote some code. The file is created but it is unsynchronized (by
> almost 2 second) and it is annoying. I am using avimuxer. I also used
> buffer for the audio source hoping to reduce the time difference. The
> following is the source and destination codes (the command line version
> of my code). Is there anything that I should consider to avoid this
> problem. Please help me. If you think that I should use other file
> formats and video muxer, please advice me.
> 
> Source:
> Audio: 
> gst-launch-0.10
> -v alsasrc ! queue ! audio/x-raw-int,rate=8000,channels=1,depth=8 !
> audioconvert ! alawenc ! rtppcmapay ! udpsink port=5002
> Video:
> gst-launch
> v4l2src ! video/x-raw-rgb,width=320,height=240 ! queue ! videorate !
> video/x-raw-rgb,rate=15/1 ! ffmpegcolorspace! ffenc_h263p ! rtph263ppay
> ! udpsink port=5000
> 
> Destination:
> gst-launch-0.10 -v
> avimux name=mux ! filesink location=videoandaudio.avi sync=true {udpsrc
> port=5000
> caps="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H263-1998" 
> ! queue ! rtph263pdepay !
> 'video/x-h263,width=320,height=240,framerate=(fraction)25/1' ! queue} !
> mux.video_0 {udpsrc port=5002
> caps="application/x-rtp,media=(string)audio,payload=(int)96,
> rate=(int)8000, encoding-name=(string)PCMA" num-buffers=5000 ! queue !
> rtppcmadepay ! 'audio/x-alaw, rate=(int)8000, channels=(int)1' ! queue}
> ! mux.audio_0;
> 
try to narrow it down. Check if you receive the material properly timestamped.
Check if avimux handles timestamping correctly when muxing.

STefan

> Thank you.
> 
> - Zelalem S. 
> 
> 
> 
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