Hello,

Thanks to Andraz and Joe help, I managed to create a fine scrolling from
Cinelerra. Before that, I had to use Imagemagick and Mjpegtools to
convert my end scrolling picture into an mpeg2video file which I then
imported into Cinelerra.

Here's what I did:
- create a new video track
- import the picture
- click on the "Generate keyframes while tweeking" small icon (it looks
  like a key) on the main window
- I modify the Y position of the camera, in the compositor window (one
  can click on the "?" icon to enter the value directly), when I'm at
  the start of the scrolling
- I click on the end of the scrolling, and then I go back 1 frame, and I
  edit the Y camera position again
- I then go back to the main window, and I then select "Camera Y" in the
  view menu.
- I then type "Alt-F" to modify the "Camera Y" green line height, to see
  it entirely on the video track
- then I click on the start keyframe while typing "CTRL" to modify the
  keyframe curve slope
- I do the same for the end keyframe, the goal being to get a straight
  line between the start and end keyframes

And then I get a smooth and constant speed scrolling!

Thank you very much for the help, guys !!! =)

Nicolas, Paris.

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