[Cin] variable fast/slow playback speed hack

[Andrew Randrianasulu]

so i wondered if changing speed for fast/slow reverse and normal playback
was possible..

after few hours of hacking I made this patch.

it makes fast/slow playback speed configurable in Cinelerra_rc via new
stored variables:


===j
LOADPREVIOUS16 /data/data/com.termux/files/home/LibRaw/RAW_CANON_G1.CRW
LOADPREVIOUS17 /data/data/com.termux/files/home/av1-cpu5-crf10.mkv
SLOW_SPEED 5.000000e-01
FAST_SPEED 4.000000e+00


here I set fast playback speed to 4x, while slow_playback default remain at
0.5 ....

no gui yet because I am still unsure about gui elements but I had idea
about putting two input boxes in Preferences for this..

but I can be wrong with my hacking....
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