[linux-dvb] Re: lost audio after cutting - problem solved

[ron <hron@gmx.de>]

Hi Klaus,
some time ago I reported a problem concerning lost audio.
I found a way now, how it works.

On Thursday 27 December 2001 18:35, you wrote:
> ron wrote:
> > Hi,
> > I have a problem with cutting the commercials from the recordings.
> > The resulting file can be replayed with VDR quite well, and all seems
> > to be ok. But when I convert the file with e.g. PVAStrumento or mplex
> > and store it as SVCD the sound is lost exactly at the position of the
> > first cut.
> > I tried also to store the cutted .vdr-file to a VCD directly and the
> > problem was the same - audio lost.
> > That seems to me a problem of the cutting process itself.
> > I'm using VDR 0.99.
> > I found in the mail archive similar reportings about version 0.82.
> > Is it a problem of my installation here?
>
> Since VDR itself (i.e. the DVB-card) is apparently able to replay the
> edited files, the problem must be with the PVAStrumento or mplex software.
> My guess would be that they get irritated by the discontinuity in the
> Presentation Time Stamps, which occurs at the editing point. These
> programs should be able to handle such discontinuities gracefully, instead
> of simply throwing away the entire rest of the audio track.
>
> Klaus
You were right. I tried another way, with other tools following a guide from
Peter Hofmann. It works (nearly) completely under linux. mplex still raised some
problems, so I extended Peters script with es_demux, which produces a
'good' audio stream. Minor sync-problems exist after the process.
Unfortunately there is no tool under linux which calculates the VPTS-APTS correctly.
So one has to use PVAStrumento.
bye 
ron


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