[mythtv] A prelude to transcoding MPEG2->MPEG2

James L. Paul james at mauibay.net
Mon Dec 8 18:26:03 EST 2003

Hash: SHA1

On Monday 08 December 2003 11:22, Craig Rindy wrote:
> Jim Paris wrote:
> > GOPchop still has issues with audio sometimes, I've heard.  It doesn't
> > really handle audio -- it apparently just keeps all non-video data
> > along for the ride while doing his chopping and hopes that it works.
> James L. Paul wrote:
> > Another observation. I've spent considerable time trying to get GOPchop
> > to generate useable streams and have not yet succeeded. I haven't found a
> > multiplexer that can recognize any segments after the first cut.
> This is quite odd because I've been using GOPchop for a while now to
> archive interview segments from talk shows and cut commercials out of The
> Kids In The Hall, The Simpsons, and South Park.  I've never witnessed a
> missing audio or sync problem using my PVR-250's streams.  It gives a
> warning about the missing header of course, and it has the unavoidable
> MPEG-2 problems of the first and last GOP of each clip.  But those two
> problems are handled by the "Ignore Errors" and "Drop Orphaned Frames"
> options respectively.  The latter option is not a solution to the latter
> problem, just a preference for the user to choose the lesser of two evils. 
> I'm quite happy with cutting on GOPs because I'm archiving stuff for
> myself, not doing production work, so I can tolerate the
> less-than-0.5-second of a commercial on the occasion when there is no black
> frame (in my experience:  ~30%) or when there's reverb in the audio along
> with a black frame.

Can you point me to the source for the version of GOPchop you are using?

> --
> Craig Rindy
Version: GnuPG v1.2.1 (GNU/Linux)


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