[gst-devel] How to syncronize audio and video

[Thabelo Mmbengeni]

Try using the "gstrtpbin" it works, checkout the documentation on the
gstreamer site.

eg  Your source can be something like

source -> encode -> payload -> gstrtpbin -> rtpsink(udp)


On Mon, Jun 22, 2009 at 9:45 AM, Zelalem Sintayehu <zelalems at hotmail.com>wrote:

>  Hi all, I wanted to save a networked stream in an avi file and I got a
> very unsynchronized file. The audio finishes almost 3 second ahead of the
> video. I even used the sync=true option for the filesink element, but the
> result is the same. So, I want to ask an advice on how to get a synchronized
> video file. The following is the source and destination commands that I
> used:
>
> Source commands:
>
> *for the audio channel*
> gst-launch-0.10 -v alsasrc ! queue !
> audio/x-raw-int,rate=8000,channels=1,depth=8 ! audioconvert ! alawenc !
> rtppcmapay ! queue ! udpsink port=5002
> *for the video channel;*
> 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
>
> Output command:
> 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"
> num-buffers=5000 ! 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" ! queue ! rtppcmadepay ! 'audio/x-alaw,
> rate=(int)8000, channels=(int)1' ! queue} ! mux.audio_0;
>
> Do you think the result will be different if I use a different file
> container (like mp4) instead of avi?
>
> Thank you.
>
> - Zelalem S.
>
>
>
>
>
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