I'm trying to put an overlay over a video and I'm having difficulties
seeking into the png in order to time-shift the video and overlay
relative to one another. In short, using `-ss` on the png results in an
error like "overlay.png: could not seek to position 10.000". Is there a
work-around?
What I'm doing is I'm generating a png 'video' for the overlay, i.e., a
file with png images one after the other at a frame rate of 1 fps. I can
do the overlay with something like:
ffmpeg -i 20190928_155656_stab.mp4 -framerate 1 -c:v png -i overlay.png \
-filter_complex "[0:v]setpts=PTS-STARTPTS[top];
[1:v]setpts=PTS-STARTPTS[bottom];
[top][bottom]overlay=x=(W-w)/2:eof_action=pass" \
-acodec aac -vcodec libx264 final.mp4
If I'd now like to skip the first 10 seconds of the overlay in order to
line up the timing better I try to use:
ffmpeg -i 20190928_155656_stab.mp4 -framerate 1 -ss 10 -c:v png -i
overlay.png ...
But that results in the error. Using `-ss` on the mp4 input works great
to time-shit in the other direction.
Can anyone recommend a work-around?
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