[Cin] [Libav-user] Dynamic_input filters and avfilter_pad_get_type

[Andrea paz]

>> Andrea, can you test attached patch +  this opts file put alongside
>> test 4k HDR video  decodable by hardware?

I compiled with the patch and put the opts in .../bin/ffmpeg.
I don't think I know what and how to test. I loaded the
iPhone13_tonemapping_checker_rev2.mp4 file you had provided. The
playback performance is good (even in reverse, with only a few
freezes). However, the video card does not activate and the CPU (not
particularly busy) does everything. The behavior is the same even
removing the opts. Suggestions?

PS: the same is true with the lines for zscale that you asked to put
in the manual. Do I have to do an opts on it? How do I text it?
I also don't quite understand how the line you report works.