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rtc: Add 1-pass scene detection and CBR RC adjustments - #5499
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Add realtime speed features check_scene_detection and overshoot_detection_cbr (enabled for speed >= 6) to detect scene/slide changes before encoding and update 1-pass CBR rate control on high_source_sad frames. Stats changed for realtime CBR mode: ~0.4/0.7% bdrate gain on rtc_derf/rtc sets, ~neutral speed change. Reduces severe overshoot on slide/scene changes.
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Add realtime speed features check_scene_detection and overshoot_detection_cbr (enabled for speed >= 6) to detect scene/slide changes before encoding and update 1-pass CBR rate control on high_source_sad frames.
Stats changed for realtime CBR mode:
~0.4/0.7% bdrate gain on rtc_derf/rtc sets,
~neutral speed change.
Reduces severe overshoot on slide/scene changes.