12 January 2020
ffmpeg
Create a video from an image sequence
ffmpeg -r 24 -i img%03d.png -c:v libx264 -pix_fmt yuv420p out.mp4
ffmpeg -apply_trc iec61966_2_1 -r 24 -i %04d.exr -c:v libx264 -pix_fmt yuv420p out.mp4
Batch convert a directory
for i in *.mov; do ffmpeg -i "$i" "${i%.*}.mp4"; done
Resize a video
ffmpeg -i *.mov -vf scale=1280:-2 out.mp4
the -2 part of scale ensures that the final dimension is a multiple of 2. You
can use -n for other multiples.
Loop an existing video X times
for i in {1..4}; do printf "file '%s'\n" input.mp4 >> list.txt; done
ffmpeg -f concat -i list.txt -c copy output.mp4
Explode a video into an image sequence
ffmpeg -i input.mp4 -vsync 0 images/%06d.jpg
Remove audio from a video
use the -an flag
ffmpeg -i input.mp4 -c copy -an output.mp4