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

[Zelalem Sintayehu]

Hi Stefan, thank you for your response. You know when I didn't get help for some time, I had lost my hope and abandon it. 2 second is considerable time. Anyway, I am sorry for my sily question, but I don't understnad what you mean by "narrow it down"? Also how can I "Check if you receive the material properly timestamped"?.

Thank you again for your help.

- Zelalem S. 


> Date: Sat, 18 Jul 2009 19:03:10 +0300
> From: ensonic at hora-obscura.de
> To: gstreamer-devel at lists.sourceforge.net
> Subject: Re: [gst-devel] How can I synchronize video and audio
> 
> 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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