On 02-09-2019 12:05 PM, Michael Koch wrote:
Hello all,
for a special effect I want to overlay a small video over the main
video, where the position of the overlay is a function of time. It's a
complicated function and can't be expressed by a simple formula.
Segment-wise linear interpolation might work, but many segments are
required and the command line may get too long:
between(t,0,1) * lerp(x0,x1,t) +
between(t,1,2) * lerp(x1,x2,t-1) +
between(t,2,3) * lerp(x2,x1,t-2) + ...
Is there any way to read the pre-calculated coordinates for the
overlay filter from a text or CSV file? Or from a PGM file, as in the
remap filter?
You can just read the whole filtergraph from a file.
ffmpeg -i in -filter_complex_script graph.txt ...
where graph.txt is
e.g.
[0:v][2:v]overlay=...[out]
Gyan
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