• paulwilkins's avatar
    Slightly more damped VBR adjustment. · 45a26dd9
    paulwilkins authored
    Increase in the damping used in adjusting the active Q range.
    This does hurt rate accuracy a little in a few extreme cases
    especially if the clip is very short*, but helps metrics.
    * Note that the adjustment is applied at the GF/ARF group level based
    on what happened in the last group.  Hence for very short clips where
    the length of a single group may be a significant % of the clip length
    there is still scope for some drift that cannot be accommodated.
    In practice most data points in our test sets are now much closer to target
    than was previously the case with default settings and in some cases are
    better even than they were with the command line undershoot and overshoot
    parameter was set very low (e.g. 2%). For example in bridge_close at high rates
    the old mechanism was unable to adapt enough to prevent extreme overshoot.
    Change-Id: I634f8f0e015b5ee64a9f0ccaa2bcfdbc1d360489
vp9_firstpass.c 105 KB