[linux-dvb] Re: Question about audio/video synchronization (was : [vdr] Lip-Synchronisation)

[Johannes Stezenbach <js@convergence.de>]

On Thu, Feb 13, 2003 at 03:53:29PM +0100, Régis Bossut wrote:
>
> This question, asked yesterday, got no answer. It is mainly directed to 
> the firmware developpers :
> 
> >Would it be possible to know how does the firmware synchronize audio 
> >and video (PTS ?, DTS ?, other ?)
> >1) during reception
> >2) during playback
> >and what is the maximum time distance between audio and video after 
> >which audio or video is not output
> >1) during reception
> >2) during playback

I don't really know all the details because synchronization
is handled in TI's (binary only) RTSL. Synchronization is always to
the PTS, if the MPEG decoder uses DTS internally is unknown to me. The
limits for synchronization are set by the available decoder
buffer space, so depends on bitrate etc.

> >This would help us [me] to understand why the sound is sometimes 
> >missing during reception and how to feed better the audio and video 
> >data during the playback.

I have no sound problems in reception, and playback
works reliable with VDR and ntuxplayer, provided the recorded
streams are OK.


Regards,
Johannes


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