Which version of cinelerra are you using (community or HV, and if
community, which SVN revision number).
In the latest version of cinelerra-CV, the automation ranges have
recently been fixed (within the last few weeks)
if you are using an older version of cinelerra-CV ensure that your
automation range, (the textbox to the left of the "Selection Start" box)
is 0-100 when editing video.
if it is say 0-700, the fade curve could possibly be cycling through 7
times, (though I doubt that would be the result, depends on the color
model, and in my experience pumping the gain of video to cause it to
wrap-around rather than smoothly fade).
Definition:
wrap-around
- when a signal multiplied by a gain exceeds the valid output range, and
(in the computer) is wrapped around (i.e. a value of 257 for a range of
0-256 would be come 1)
and example:
Consider a video signal that was recorded dimly such that no level ever
exceeded 128, (whilst the range for color is 0-256). If one applied a
gain of 200 % to the track, this would cause the output video range to
never exceeed 256 which is valid and keeps the output signal within the
. But if the user applied a gain of 210 % then the video pixels with an
amplitude of 128 would be 269, but wrap-around (within the computer)
would result in this becoming 13 (= 269-256). But this is only for that
specific pixel!
P.S. I haven't seen many videos that are recorded that dimly!!
Raffaella Traniello wrote:
Thanks Nicolas.
If I reposition it vertically I'll move the whole flat curve. At the
bottom end of the track I'll get a dark image, at the top end I'll get a
bright one. But in between I'll have 7 (seven!) cycles of dark to bright
image. What's for?
Could you show us a screenshot?
Not without hours of learning.
In the video track I set the white line shaped like this:
________
/
_______/
with the beginning at the bottom border of the video track and the end
at the top border. I used all the available space, the maximum height.
If I playback the timeline I see the blinking effect in the compositor
(if I play it slow I can see the cycles).
I tried it again with another footage.
The mouse cursor never changed shape over the white line.
I had to launch Cinelerra 3 time before being obeyed.
I had 25 light cycles this time.
Something funny is going on here...
What do you think?
Ciao
Raffaella
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