https://cinelerra-gg.org/download/CinelerraGG_Manual.pdf
http://g-raffa.eu/Cinelerra/HOWTO/basics.html
.
+2021 August New Features of note:
+ FFmpeg has been upgraded to 4.4 to include new plugins.
+ Speed PerCent plugin for easily changing video speed
+ is now available.
+ FAST_SPEED and SLOW_SPEED variables to personalize your
+ playback speed have been added.
+.
2021 July New Features of note:
Libraries x264, x265, and libaom have been upgraded.
YUV Colorspace 601 and 2020 have been split into more