Audio and Video Timestamp or Offset Problems

Wim Taymans wim.taymans at
Tue Jul 19 11:58:58 PDT 2011

On 07/19/2011 08:50 PM, William Metcalf wrote:
> Hello all,
> I am reading in Raw Audio and Raw Video from capture cards, and then
> rendering them directly to my computer. I am able to do this fine, but
> the resulting video is ahead of the audio. My initial thought was to
> start the Audio pipeline, and then wait 2 seconds and start the video
> pipeline. When I executed this code the audio began playing sooner than
> the video as it should, but then the video just played faster until it
> was ahead of the audio again. I then tried pausing 5 seconds before I
> started the video pipeline just to see what would happen, and that time
> the video did the same thing. Because the video always plays ahead of
> the audio at the same rate, I am now thinking this problem is a
> timestamp or offset issue of some sort. Is there any way to adjust the
> Video/Audio offset, or is there a better way to delay the video so that
> it will not speed up and pass the audio?
> Here are my pipelines:
> video - appsrc max-bytes = 0 is-live=true typefind=true !
> "video/x-raw-yuv,format=UYVY,width=720,height=486,framerate=30/1" !
> autovideosink
> audio - appsrc max-bytes=0 is-live=true typefind=true ! audioparse !
> autoaudiosink

You forgot to configure the latency on the appsrc elements. Try setting 
the min-latency property.

> Thank you for any help you can offer,
> William
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