[FFmpeg-user] slideshow with crossfade

[Michael Koch]

Let me explain again what I want to do. I have 5 pictures:
1, 2, 3, 4, 5
I want to read these pictures with framerate 0.5 and then convert the 
framerate to 2, so that each picture is repeated 4 times:
1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5
As the last step I want to make the crossfadings with the framerate filter:
1x1, 1x1, 1x1, 1x2, 2x2, 2x2, 2x2, 2x3, 3x3, 3x3, 3x3, 3x4, 4x4, 4x4, 
4x4, 4x5, 5x5, 5x5, 5x5
The result is that each picture is shown for 1.5 seconds, followed by a 
0.5 second crossfade.

Michael