parse_options reads : and , as separators and = as the only assignment, so a
segment without = becomes a valueless flag set to 1. The shipped strings used
ffmpeg command line spelling, which parses without error into other values.
- crf:16 parsed to {'crf': '1', '16': '1'}, encoding every api, framepack and
seedvr video near lossless rather than at crf 16
- crf=23:b:v=0 pinned the generic bitrate option to 1 bit per second on vp8 and
vp9, collapsing their output
- qscale:v=3 reached mpeg4 and mjpeg as nothing at all, replaced by an explicit
quantizer range
- test-video-codecs.py asserts every preset segment carries an assignment
CalamitousFelicitousness
Vladimir Mandic