Re: [transcode-users] MPEG2: cut only

[Udo Wolter <uwp@xxxxxxxxxxxxxxxx>]

On Sun, 11 Jul 2004, Tomi Ollila wrote:

> > > Ok. I tried your ideas too and it works. But: lve seems to handle
> > > B-frames very well and even seems to recode some frames between so you
> > > wont have any pixelnoise in a cut-scene. With the dummy program
> > > you might get more A/V sync stability but with the price of pixels
> > > in the cut. Isn't there any solution where we can have both: correct
> > > A/V sync AND recoding of the in-between-cut-scenes ?
> >
> > Probably by cutting start position one gop early and set "broken flag"
> > there?
>
> ... and there is tool that does just that, GOPchop
> (http://outflux.net/unix/software/GOPchop/).

Hm, my tries with GOPChop hasn't been that good. There are even pixels
on I-frame boundaries. It's the worst of all cut methods, even avidemux
returns better results.

> That marks first GOP as broken if it it `open gop'.
>
> GOPchop also does 'hard cuts' -- it does one minor adjustments (although
> development versions have option to 'fix' timestamps)

I haven't managed to get GOPChop cut on B-Frames. It seemed that it only cuts
on I-Frames. Ok, I only tried version 1.0. Just tell me if the development
version supports it and I'll give it another try.

> I used to first replex, then GOPchop and again replex material that had
> these a/v sync issues, the reason for lve+dummylverxcut is that it started
> crashing when editing my 16:9 input material -- also lve is much faster
> to use than GOPchop.

I tried GOPChop every now and then and compared to the first versions
it has gotten much faster. But it doesn't bring that kind of result
I like to have: a clean cut on every frame I like without pixel problems
and without losing A/V synch. It seems that there is no such application
that can do this right now.

Mermgfurt,
                Udo
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