Paul,
Something like this:
zoompan=zoom='if(mod(in\,40)\,zoom\,0)+0.01':d=40:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
thank you very much for this hint. The _in_ parameter does indeed work.
With this parameter it's for example possible to make a slideshow and
specify different durations for each image.
I'd like to make two suggestions for improvement:
1. Please add to the documentation that _in_ is 1 (not 0) for the first
picture.
https://www.ffmpeg.org/ffmpeg-all.html#zoompan
2. It would be nice to have an expression for a lookup table, for example
lookup(x, y0, y1, y2, ... , z)
Evaluate x, and if the result is 0 return y0, if the result is 1
return y1, and so on, else if the result is out of range return z.
Michael
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