[Cin] megapile 12 (freebsd, ffmpeg 5, dynamic build, opencv trim)

[Andrea paz]

Tried the build with megapatch_12. Everything OK: it compiles without errors.
I enclose cin5_ffmpeg4.log. There are many "warning+error" concerning
Latex and the html manual and many "warning" concerning c++. I don't
know if they are important or not; everything works fine for me.
TrueHD loading and playback works fine; I tried it with 2 examples
containing video and 22 audio tracks. I have not tested the encoder.
Otherwise, I wouldn't know what to test since I don't have
termux/bsd/bluray. You tell me what to test.

Then I tried a build with --without-thirdparty (also removing dv;
libdpx and firewire), to get ffmpeg5 working. Everything works fine.
As I noticed before, putting opencv plugins is not possible: CinGG
doesn't start. Incompatibility with ffmpeg5?
I attach cin5_ffmpeg5.log, if you want to make comparisons. There are
some warnings but not the same as I had with internal ffmpeg4.
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