Player/transcoding settings gain encoder controls:
- Rate-control mode VBR / CBR / QP (constant quantizer). x264: VBR uses
-b:v/-maxrate/-bufsize, CBR adds -x264-params nal-hrd=cbr (min=max=b:v),
QP uses -qp N (no bitrate). VP9 maps QP -> -crf N -b:v 0, CBR -> min=max=b:v.
- Preset list expanded to ultrafast/superfast/veryfast/faster/fast/medium
(was only ultrafast/superfast); for VP9 the preset maps to cpu-used.
- New QP field in the UI, shown when rate control = QP, otherwise the
bitrate field is shown.
Both /play.mp4 (archive) and /live.mp4 accept rc + qp query params.
All three modes verified producing valid output on the live restream.
VERSION -> 0.0.119.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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