# Isolate motion-vectors using 'difference128' blend filter
# - add brightness, contrast, and scaling, to taste
ffplay \
-flags2 +export_mvs \
-i "video.mp4" \
-vf \
"
split[original],
codecview=mv=pf+bf+bb[vectors],
[vectors][original]blend=all_mode=difference128,
eq=contrast=7:brightness=-0.3,
scale=720:-2
"
Works best with higher-resolution videos; 4K source used in this case.more info: https://trac.ffmpeg.org/wiki/Debug/MacroblocksAndMotionVectors
source video: Czech National Ballet - https://www.youtube.com/watch?v=bn12Ffi15Go
shorter alt. version: https://www.youtube.com/watch?v=KN_c4mdBpvg
