Andrew,

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)