[Asterisk-video] app_mp4

[Duane Storey]

Hi Sergio,

I'm not sure I understand what you mean.  The RTP timestamp should increase
at 8000 or 16000 every second for audio, and for video it should increase at
90000 per second.  If you're seeing the occasional timestamp of 0, then
that's a bug.

If you're trying to record video and sync it with audio, there's a
relatively simple way.  If you always keep the last decoded frame in memory,
then you can either play it twice or skip it periodically to keep it in sync
with the audio.  I.e. if you're writing 30 fps into the file, and you've
played out 16000 samples of audio, but you've only written 28 frames, then
you can repeat the last frame two times to resync it (since you've written
one second worth of audio, and you also need one second worth of video).

Duane

On 5/24/06, Sergio García Murillo <Sergio.Garcia at ydilo.com> wrote:
>
>
> > I can probably help you with the audio/video sync.  It's a bit tricky
> when there's VAD/DTX, but not impossible.
>
> Hi, Duane
>
> My main problem is that I don't know how to extract exact timing from the
> frame structure. If I have the timestamp value from the rtp I could just
> handle the vad and the silence suppression just fine. I'm using the samples
> value but it seems that when it's some silence suppression I get a 0 in it.
> The other problem I have found is that my eyebeam doesn't start sending
> video immediately, so I'll have to make some extra timing to be able to
> measure this delay.
>
> Greetings
>         Sergio
>
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