Exposure of command-related methods for the filter #1998
Description
Video processing seems both fun and complex. In that sense, as a Python user, I feel very fortunate to have PyAV.
Recently, I've been encountering issues while using various filters. The root cause is that you can't control the options of a pre-built filter at runtime. (For example, moving the position of an overlay or changing its size.)
While search a few filters recently (involving sendcmd, zmq, etc... quite complex work), I discovered that libav actually allows direct command injection into filters. (Ta-da!) Currently, for my overlay, I'm recreating everything every time x or y changes.
I wish avfilter_process_command were exposed in PyAV. I'd love to implement it myself if possible, but I'm practically a novice when it comes to Cython and libav. Someone else seemed to have the same idea five years ago, but that issue has since been stale.
Is this even feasible? It could make my life so much easier.