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Raffaella Traniello schrieb:
> If I add a title on an image, I can see the blank frame effect at the
> beginning of the title and
> a sudden change of brightness in the compositor window, that become lighter
> for the length of the
> title. I think it makes the movie unwatchable. I see a similar change of
> brightness when I play
> and stop my project on the timeline. The compositor window is lighter if I
> stop and becomes
> darker playing. Which is the final brightness?
Hello Raffaella,
I can observe this effect too in my setup. It ist caused by cinelerra
switching the output method to display the video. (Thats my conclusion,
maybe others can give a better explanation?).
Cinelerra does on every frame first an internal decission: can it output
direcly off the source material or need it be passed through the compositing
and effects engine? Morover there are different methods to display video: it
can be explicitely drawed to the output, or it can use a little bit of hardware
acceleration (X-XV).
I myself don't know to much of this and always wanted to find out some method
to get both display methods look similar on the monitor. But at the moment,
still images and the normal desktop are displayed in one flavour (a little bit
brighter and with lower gamma, maybe there is some gamma correction going on?),
wheras my accelerated display is a little bit darker and has larger gamma.
But this differences don't end up in the final rendered output.
To check the results, I am doing test renders of parts of my project in a
format I can play with the vlc media player (or with mplayer).
I use the following settings (geared at maximum quality playback on pc):
Container: Quicktime for Linux
Audio codec: 16bit linear PCM (signed = 2 complement)
Video codec: MPEG-4 Video
Bitrate: 25000000
Fixed Quantisation to 1
Keyframe Interval 1
(interlaced, because I have interlaced footage
and want to retain it interlaced)
To render a part of the timeline: select it, arm the necessary tracs and then
choose Render from Menu. It should display the process in the compositor.
I know this all is very complicated and you should experiment to find out a
combination workable for your setup. Other people reported of all sorts of
problems with MPEG-4
But I use it because I had very view problems and can play Quicktime/MPEG-4
with the least problems on my different media players.
And I use VLC becose for my setup it has the best handling of interlaced
material. With the deinterlace method "linear" I get smooth sharp HDV images
in fullscreen mode without any flicker, it looks as if vlc really creates more
then 25 frames on the display, while all other movie payers do a full
de-interlace
and the material looks progressive. I know, movies shot on real film are
progressive
and so progressive material looks a little bit more like "film", but I
deliberately
choose the interlaced look, because I count the possibility of very smooth
movements
and the possibility to shot on low light conditions with very unobstrusive
artificial
lithting as the main strengths of video. And why fighting against the nature of
the
medium?
Maybe someone can give other suggestions/better explanations
(and I am in a hurry at the moment....)
Cheers,
Hermann
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