[gst-devel] How to syncronize audio and video

Zelalem Sintayehu zelalems at hotmail.com
Mon Jun 22 09:45:50 CEST 2009

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
-v alsasrc ! queue ! audio/x-raw-int,rate=8000,channels=1,depth=8 !
audioconvert ! alawenc !  rtppcmapay ! queue ! udpsink port=5002
for the video channel;
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
num-buffers=5000 ! queue ! rtph263pdepay !
'video/x-h263,width=320,height=240,framerate=(fraction)25/1' ! queue} !
mux.video_0 {udpsrc port=5002
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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