Audio and Video Timestamp or Offset Problems

William Metcalf [hidden email] · Tue, 19 Jul 2011 14:05:15 -0500

Wim,

Thank you very much for your quick response.  I have a few questions 
about the min-latency property.  The gst-inspect of the appsrc element 
shows the min-latency property, but it only shows that the property is 
an int64.  Is the latency measured in microseconds, milliseconds, or 
seconds?  Also, what does the min-latency property control?  The minimum 
latency between sent buffers?

Thank you again for your help,
William

On 7/19/2011 1:58 PM, Wim Taymans wrote:
> 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.
>
> Wim
>>
>>
>> Thank you for any help you can offer,
>> William
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>

Audio and Video Timestamp or Offset Problems

Audio and Video Timestamp or Offset Problems

Re: Audio and Video Timestamp or Offset Problems

Re: Audio and Video Timestamp or Offset Problems