Audio and Video Timestamp or Offset Problems
wmetcalf at niftytv.com
Tue Jul 19 12:09:14 PDT 2011
-------- Original Message --------
Subject: Re: Audio and Video Timestamp or Offset Problems
Date: Tue, 19 Jul 2011 14:05:15 -0500
From: William Metcalf <wmetcalf at niftytv.com>
To: Wim Taymans <wim.taymans at gmail.com>
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,
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" !
>> audio - appsrc max-bytes=0 is-live=true typefind=true ! audioparse !
> You forgot to configure the latency on the appsrc elements. Try
> setting the min-latency property.
>> Thank you for any help you can offer,
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
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