Hi everyone,
I routinely generate time-lapse videos from series of pictures taken by fixed
cameras (minimum 10 000 images per video) with the following command :
ffmpeg -f image2 -r 5 -pattern_type glob -i '*[0-9].jpg' -vf
"scale=1620:1080,format=yuv420p" -vcodec libx264 final.mp4
Everything usually works, except for yesterday when I had 10 000 pictures and
from this set I had three sequences of images, with varying dimensions :
* the first 8 000 pictures : 5184x3456
* 8 pictures : 720x480
* the remaining pictures : 5184x3456
Starting around the 8000th picture, ffmpeg started dropping frames and the
behaviour continued up until the end of the file.
Of course when I tried to play the file, it ended around the 8000th picture.
I managed to isolate the problem : the culprits were the low res images
(720x480) and by eliminating them from the set, the process went smoothly and
produced a nice MP4 with all the pictures, from start to finish, without
dropping any frames.
My question is : how could I ask ffmpeg to not be bothered by the pictures
resolution changes and scale them according to the output dimension, 1620:1080,
even though input images might be smaller than that ?
Following advice on Stack Overflow, I tried to modify the output scale with
"scale=1620:-2” instead of "scale=1620:1080” but nothing changed, frames
continued to be dropped…
(I’m using ffmpeg 3.2.14 and I haven’t tried a newer version)
Cheers.
Flubb.
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