const VP8_UNFILTERED_QINDEX: u32 = 16;Expand description
The finest VP8 quantizer indices, at and under which a held band is coded with no loop filter
(band_roi), as libvpx itself filters a frame there at level 1 at most. libvpx starts a
frame’s level from the last frame’s and keeps it while a strip across the middle of the
picture shows no gain, which a band elsewhere leaves as it was: the bands above the middle of
a sweep after motion kept the level its coarse frames left (46), and 1080p text swept at
index 2 ended at 42.7 dB at 8 fps 2 Mbit/s against 50.6 unfiltered, at 15 fps 43.6 against
50.6, at 30 and 60 fps level. At coarser indices libvpx’s level stands, unfiltered coming out
0.2 to 0.4 dB short at 24 and 73. A refresh held whole shows the strip, and libvpx’s level
came out 0.3 to 0.8 dB finer than none at index 3.