I just figured out how to make a slideshow with crossfade. It's a two
step process. The first step reads the pictures with framerate 0.5
(which means 2 seconds for each picture), and produces an intermediate
video with framerate 2. That means each picture is repeated 4 times. The
second step applies the framerate filter. In the output video each
picture is shown for 1.5 seconds, followed by a 0.5 second crossfade.
ffmpeg -framerate 0.5 -i IMG_%3d.jpg -r 2 -codec:v mpeg4 temp.mp4
ffmpeg -i temp.mp4 -vf "framerate=fps=25" -codec:v mpeg4 out.mp4
This two step process works fine, but I have two questions:
1. Is it also possible to get the same result in one step, without an
intermediate video file?
2. If the answer to the first question is no, can someone please show me
how the above commands must be modified for a lossless intermediate
file, for example RAWVIDEO?
Thanks,
Michael
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