FFmpeg how to get an image for a particular 'coded_picture_number' together with motion vectors

问题

I am looking for ways to get this output from ffmpeg:

Basically, I would like to pass to the shell, a command that allows me to output a particular frame number, let's say coded_picture_number=200 with the motion vectors drawn into it.

Any clue? Thanks in advance.

回答1:

This

ffmpeg -flags2 +export_mvs -i video.avi -vf 'select=gte(n\,200),codecview=mv=pf+bf+bb' -vframes 1 frame.png

will open video.avi, skip first 200 frames (n starts from 0), visualize motion vectors (all types), and writes exactly 1 frame into frame.png.

来源：https://stackoverflow.com/questions/48988473/ffmpeg-how-to-get-an-image-for-a-particular-coded-picture-number-together-with