[Cin] Test rendering whit x265

[Andrea paz]

The difference between appimage and build is that the former uses
ffmpeg-4.3 and the latter ffmpeg-4.4. There is a small difference
between the 2 renders, see mediainfo test-1.txt (appimage) and
test-2.txt (build). It seems that ffmpeg-4.3 is more accurate. The
real video source has 7500 frame (5min 0sec at 25 fps)!

(Note: as usual, I can't install ydiff, sorry!
[paz at arch-paz cinelerra-5.1]$ make ydiff
make: ***  No rules for generating the "ydiff" target.  Arrest.)

PS: I think most users don't look at the messages on the terminal:
appimage you have to specify it if you want to run from shell. If you
compile from terminal, having multiple messages should not be a
problem. In my opinion we can leave the messages without hiding them.
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