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

[Zelalem Sintayehu]

Hi Stefan, thank you for your e-mail. I understand what you mean now. I will try to do both and will tell you the result.

Thank you again for the support.

- Zelalem S. 


> Date: Sat, 18 Jul 2009 22:51:03 +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 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.
> 
> Don't expect that everything is ready. I don't have an explanation for the
> problem you see. As nobody else was answering, it seems that you will have to
> figure our what the probelm is. With "narrow it down", I was suggsting to try to
> make simpler/different variants to see if you can pinpoint the problem. E.g.
> recod to a mp4 with mp4mux to see if it might be a problem in avimux.
> 
> Also you should not start two pipelines on the src side, instead of
> 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
> 
> just do
> 
> Source:
> gst-launch-0.10
> -v alsasrc ! queue ! audio/x-raw-int,rate=8000,channels=1,depth=8 !
> audioconvert ! alawenc ! rtppcmapay ! udpsink port=5002
> 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
> 
> Then both livesource use the same clock to timestamp buffers.
> 
> Stefan
> 
> 
> > 
> > - 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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