[FFmpeg-user] Region of Interest Coding in ffmpeg

[Yang Guo]

Hi ffmpeg community,

I am looking to encode a frame with "region of interest (ROI)" coding.  The
idea is that I have a frame in which I know that certain regions (for
example, the center) are more likely to be the subject of interest relative
to other regions (ex: the sides).  My thought was to use macroblock-level
quantization stepsize (QP).  How can I achieve this with ffmpeg from the
command line?

Moreover, ideally I would like to specify a different ROI for each frame.
How can this be done?

Thanks for your help in advance!

Yang