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vo_gpu: use dB units for scene change detection

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Rather than the linear cd/m^2 units, these (relative) logarithmic units
lend themselves much better to actually detecting scene changes,
especially since the scene averaging was changed to also work
logarithmically.
This commit is contained in:
Niklas Haas
2019-01-04 16:46:38 +01:00
committed by Jan Ekström
parent b4b719e337
commit 3f1bc25d4d
4 changed files with 15 additions and 14 deletions
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6
DOCS/man/options.rst
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@@ -5264,9 +5264,9 @@ The following video options are currently all specific to ``--vo=gpu`` and
to excessive flicker. (In signal theory terms, this controls the time
constant "tau" of an IIR low pass filter)
``--hdr-scene-threshold-low=<0..10000>``, ``--hdr-scene-threshold-high=<0..10000>``
The lower and upper thresholds (in cd/m^2) for a brightness difference to
be considered a scene change (default: 50 low, 200 high). This is only
``--hdr-scene-threshold-low=<0.0..100.0>``, ``--hdr-scene-threshold-high=<0.0..100.0>``
The lower and upper thresholds (in dB) for a brightness difference
to be considered a scene change (default: 5.5 low, 10.0 high). This is only
relevant when ``--hdr-compute-peak`` is enabled. Normally, small
fluctuations in the frame brightness are compensated for by the peak
averaging mechanism, but for large jumps in the brightness this can result