Dear Cinelerra users,
I would like to create a horizontal scrolling of a still picture, to create a
DV (or MPEG2) interlaced PAL video at 25 images per second (thus 50 fields per
seconds, as it is an interlaced mode). The result will be seen on a PAL
television in interlaced mode.
I have tested two methods:
- I have used the Camera X parameters with keyframes.
- I have also tested the Translate effect.
The problem is that the resulting video sequence, at 25 interlaced images per
second, does not have 50 fields per seconds. I can see it, as there is a
vertical line in the still picture. With two fields in one picture, the
vertical line should have jaggy edges created by the interlaced two fields.
Unfortunately, the output of Cinelerra is a sequence of perfect, 25 images per
seconds, with no intermediate fields computed. This result in a 'not so smooth'
scrolling on the television set.
I have specified in Cinelerra that the video is interlaced, and I have even set
interlaced flag when importing the still picture.
The purpose of this is to add scrolling titles to DV video recorded during the
holidays. The titles are created in Inkscape and the Gimp.
So I have two questions:
1. Is it the normal behavior of Cinelerra (not to create the two fields when
computing a translation at 25 images per second, interlaced)?
2. If not, could you please explain to me how to tell Cinelerra to compute
these two fields?
Sincerely yours,
Lionel
P.-S. I use Cinelerra 2.1CV on Gentoo Linux.
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