[Cin] possible cinepack profile speedup

Phyllis Smith phylsmith2017 at gmail.com
Wed Jun 30 01:01:34 CEST 2021

Will check these in.   cinepak changes make it run twice as fast and the
mediainfo is the same except for sizes.

Results from running before and after:
Old: 2713 frames in 777.079 seconds / size = 34935959
New: 2713 frames in 337.795 seconds / size = 36845828
Since the new is bigger in size, it is probably better.
I ran ydiff on the 2 files and although they were not a perfect match, I
could not see any anomalies and they looked the same to me.

I basically added
> max_extra_cb_iterations=0
> min_strips=3
> this speedups encoder but quality is lower (not sure how much, was too
> inpatient to wait for 1 min clip encode at 352*144 25 fps! with those
> parameters ffmpeg encodes at nearly 3 fps, yay! In theory one can try to
> set up renderfarm + number parallel  ffmpeg encoders, because encoder is
> single threaded - but I haven't tested this)
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