On Thu, 03 Aug 2006 18:11:52 +0200, Hermann Vosseler <[EMAIL PROTECTED]>
wrote:
Marcin Kostur wrote:
Suppose i have two video tracks which i would like to join with a
transition. Additionally i need
to corret colors (e.g. histogram) on those tracks,
...
If i apply effect to each track, then the transition will use
uncorrected part in overlapping
moment (is it a bug?).
...
The way i did it was "correct a track and render" but it introduced
unecessary DV-reencoding.
Andraž Tori wrote:
you probably want to say that two edits overlap. just render them first
with all the corrections
you want and then use the new media files.
Hello Andraž,
Hello Marcin,
quite often, I got struck by this behaviour. I consider it -- not quite
a bug, but rather a shortcomming of the design, i.e. the way transitions
are implemented and controlled in cinelerra.
It is a shortcoming in the design, and it has been discussed before.
The problem is actually not the effect order, but the fact that effects
are applied to the timeline only. The transition effects peeks into
parts of the source video that is beyond the edit, and not on the time-
line. Whether you apply the effects before or after the transition, it
will not fix this problem.
Say clip A has a brightness correction and clip B has a colour correction,
applied as effects, and a crossfade between them:
(CF)
AAAAAAAAAAAAAAAAAAAAAAAAA
BBBBBBBBBBBBBBBBBBB
<brightness correction><colour correction>
At the clip point, A starts fading away, but suddenly loses the brightness
correction. B's colour correction slams in at 100% before B is visible,
and is applied to the mix of A and B.
What Marcin and Hermann want, is the brightness correction to be applied
_only_ to A _throughout_ the crossfade, and the colour correction to be
applied _only_ to B, also during the crossfade.
Some of us suggested that we should implement this, with extra markings
on the timeline to indicate when effects would "bleed" into transitions.
However, it was deemed too complex, and dropped.
You may get almost the desired result by crossfading the effects, using
keyframes, if the transition is a crossfade. Otherwise, you have to
use two tracks.
--
Herman Robak
_______________________________________________
Cinelerra mailing list
[email protected]
https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
