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Hello Ivan,

Cinelerra uses a maybe not too intuitive interpolation strategy:

If the value can't change between two keyframes (or "imaginary keyframes"
that were created by interpolation between existing ones) it uses the value
of the preceding (imaginary) keyframe until the new keyframe is reached.

> It seems in cinelerra that means that I should have zoomed in
> projection parameters [0,0, 3] after the last frame in first scene. I
> also need default projection [0,0, 1]  before the first frame of
> second scene. 

I think you want to have [0,0,3] *at* the last frame in first scene and
[0,0,1] *at* the first frame of the second scene. That would make the
Timeline look as follows (zoom in in order to see the single frames in
cinelerra's timeline)

F|K L|k f|S

where:

F = First clip
K = Keyframe [0,0,3] at beginning of
L = Last frame of first clip
k = keyframe [0,0,1] at beginning of
f = first frame of second clip
S = Second clip
| = Tick/border between two frames, however Keyframes are shown as sitting
on the preceding border.

I hope that explanation was sufficient :)

With best regards,
Simeon
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