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

Zelalem Sintayehu zelalems at hotmail.com
Tue Jun 30 12:03:59 CEST 2009

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.

gst-launch-0.10 -v alsasrc ! queue ! audio/x-raw-int,rate=8000,channels=1,depth=8 ! audioconvert ! alawenc ! rtppcmapay ! udpsink port=5002
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

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;

Thank you.

- Zelalem S. 

Windows Live™: Keep your life in sync. Check it out!
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