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

[Régis Bossut <rbossut@auchan.com>]

Johannes Stezenbach écrit:

> 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.
I happen to have such problems when receiving some french (FTA) channels 
like TV5, Arte... where sound disappears and comes back mainly on scene 
changes.

I also get the sound cut during the time that I display dark regular 
text (color index = 0) on white background (color index = 3) on OSD with 
a 2-bit color depth (0.9.4 rootfiles dated 01/04/2002 or 05/03/2002). 
When I change the background color index from 3 to 2, I don't get the 
sound cut.

Funny, isn't it ?

/Régis



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