[vdr] Re: cutting frame accurate in VDR?

["Rienecker, Fa. Evenio, ITS P, M" <C.Rienecker@deutschepost.de>]

> > >  > I-Frames to avoid the jitter effect at the editpoint (for example:
> > >  > IBPBBPBBPBBP IBPBBPBBPBBP IIIII IBPBBPBBPBBP IBPBBPBBPBBP).
> > >
> > >That would have been my first idea, too.
> > >However, I haven't yet found any code that converts a GOP into
> > >all I-frames. If we were able to perform that conversion, I believe
> > >doing the cutting the way you described shouldn't be a problem.
> > >
> > >Klaus
> > >--
> > 
> > Maybe someone knows how to convert a GOP into all I-frames? Then
> > maybe frame accurate cutting could be integrated in VDR, that would
> > be the nicest solution anyway...
> 
> I know, how to convert a GOP into all I-frames: By reencoding the GOPs
> where the cuts occur.
> 
> Setting only I-frames btw. is a bad solution, as it requires a lot of
> unnecessary bandwith. You can simply use a shorter GOP 
> instead as a GOP
> does not have to have a fixed size. Example (| marks the cut point):
> Before: ...IBPBBPBBPBBP IBPBB|... {commercial break} ...|PBBP
> IBPBBPBBPBBP...
> After:  ...IBPBBPBBPBBP IBPBP     {no more break :-)}    IBBP
> IBPBBPBBPBBP...
> where IBPBP and IBBP are reencoded.
> 
> But as I mentioned before: How to sync the audio?


Is there any need to sync audio.
Actually you just need to replace at most two frames.

At the a start of the new stream we need to replace the B- or P-frame with an I-frame and at the End of the new stream we only need to replace the last frame if it's a B-frame, as P-frames don't need to now anything about follwing frames.

If you want to optimize this you don't even need to replace the last B-frame if you provide the next I-frame on which the B-frame is dependend on. But this may result in strange behaviour when replaying the end.

CU,
Christian.

> 
> With kind regards
> 
> Jörg
> 
> 
> 
> 
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