Re: [Mlt-devel] Non-destructive rendering

[Jean-Michel <jm...@fr...>]

Le jeudi 26 octobre 2006 =C3=A0 18:36 -0700, Dan Dennedy a =C3=A9crit :
>=20
> I believe you need automated "offline" capability more so=20
> than "non-destructive rendering." Non-destructive editing *only* makes
> sense=20
> if the input and outputs are the same coding and not
> temporally-compressed=20
> like MPEG-4 is. If you have an edit point in the middle of an MPEG-4
> GOP,=20
> then you will need to recode the parts in the GOP, and this is even
> more=20
> complicated if it using B-frames. Perhaps you want to transcode all DV
> clips=20
> to MPEG-4, do the distributed, collaborative editing, then change the
> final=20
> project file to refer back to the DV clips for the best quality for
> anything=20
> needing rendering. Finally, the non-destructive rendering only works
> when the=20
> rendered output is DV, which is increasingly rare.=20

Dear Dan,

Why not record the whole GOP, in case of a transition.=20
Usually, it is only 1 or 2 seconds.

In Kdenlive, this is like a clip would be cut in three pieces:
- First GOP : recoded
- Main video : ffmpeg -acodec copy -vcodec copy
- Last GOP : recoded

Kind regards,
Jean-Michel