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[linux-dvb] Re: AW: Re: VDR and DVD with pause -> noise corrupt
Klaus Schmidinger writes:
> Ralph Metzler wrote:
> >
> > Klaus Schmidinger writes:
> > > If the audio frames don't contain a PTS, it's no wonder they get out of sync
> > > (even in normal replay video and audio gets out of sync after some time).
> >
> > They should not any longer after my last firmware syncing patch
> > about 10 days ago. This patch no longer was a workaround for the
> > "jerking picture bug", which would just sync audio/video at the start
> > of playback, but a complete fix. Syncing is always on now.
>
> I just replayed a DVD with the latest versions of both driver and VDR,
> but after a while video and audio ran out of sync (audio was about half
> a second early). I'm not talking about external AC3 replay, but "internal"
> replay of both audio and video via the DVB card (converted by the 'ac3dec'
> that comes with VDR).
>
> Do others also experience this, or is it just me?
>
> > > Is there a way to have ac3dec generate the necessary PTS for the audio frames?
> > > The original Dolby Digital frames that ac3dec uses to generate the "normal"
> > > audio frames must, I believe, contain a PTS, don't they?
> >
> > Of course they contain the correct PTS but reinserting it would not
> > help because the decoder hardware does not support syncing for PCM sound.
But you were talking about "normal replay" which I understood to mean
normal MPEG2 video and MPEG audio.
As I already wrote above, there is no syncing if using PCM. So, I am not
surprised that sync is lost.
Or does your ac3dec convert to MPEG audio? If it does, does it insert
the proper PTSs?
Ralph
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