[vdr] Re: Cutting problems?

[Wolfgang Fritz <wolfgang.fritz@gmx.net>]

Dr. Werner Fink wrote:
> On Tue, Feb 04, 2003 at 11:29:48PM +0100, Klaus Schmidinger wrote:
>
> > > So times in marks.vdr are correct for the video stream?
> > Actually VDR doesn't look at any PTS or whatever when cutting. It simply
> > takes the I-frame at the starting point together with whatever audio
> > packets might be in there. This is a very simple approach which must
> > work since replaying an MPEG2 stream must be able to start at any time
> > from the next available I-frame.
>
> Nevertheless, on replaying there are _sometimes_ some distortions
> visible (`Kloetzchen') and audio sometimes gives sharp noise.
I demuxed a vdr file with distortions using ds.jar. Playing the 
resulting mpeg video file alone with mplayer does not show the 
distortions. It seems  the audio discontinuity confuses the players.

> Whereas if tosvcd uses marks.vdr to do a svcd image using
I will try a similar approach with ds.jar which is supposed to support 
cutting too. Does tosvcd place the cuts at _exactly_ the same position 
as vdr? I am trying to place the cuts at the best possible position with 
vdr and would like to keep that position.

Nevertheless, ds.jar compensates the missing audio frames by inserting 
"silence" at the cuts which I can live with because the cuts often are 
at scene boundaries.

> mpeg2enc this seems not to happen.  mpeg2enc seems reorder the
> PTS and recalculates sync offset of the audio part.
IIRC tosvcd has (or had) problems with _already cutted_ recordings, 
maybe it does not recover from the audio dicontinuities as good as ds.jar

Wolfgang
>         Werner



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