[FFmpeg-user] Average a "rolling" N frames?

Paul B Mahol onemda at gmail.com
Thu Apr 21 10:03:01 EEST 2022

On Thu, Apr 21, 2022 at 7:03 AM Steven Kan <steven at kan.org> wrote:

> I’m putting together a time-lapse video of bees building comb in the hive.
> I have 5,000+ jpgs (and growing!) in a directory that I process with:
> ffmpeg -hwaccel videotoolbox -framerate 60 -pattern_type glob -i '*.jpg'
> -c:v h264_videotoolbox -b:v 100M CombLapse.mp4
> which results in:
> https://www.youtube.com/watch?v=CvGAHWVcbwY
> Someone suggested that I try to “remove the bees” and get video of just
> the comb. Which got me thinking, what if I could do a rolling average of,
> say, 100 frames? So frame 1 of my output would be the average of frames 1 -
> 100, and frame 2 of my output would be the average of frames 2 - 101, etc.
> I’ve used -vf tmix=frames=10:weights=“1” to take 10 frames of input and
> output 1 frame, but what syntax could I use to do a rolling average?

tmix by default does rolling average if you use no other filters.

> Or would I have to loop through the jpgs twice? Once to get 4,900 averaged
> stills and then another run to combine those into my video?
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