The first parameter is AlphaC0 (default: 0). This adjusts
thresholds for the H.264 in-loop deblocking filter. First, this
parameter adjusts the maximum amount of change that the filter is
allowed to cause on any one pixel. Secondly, this parameter affects the
threshold for difference across the edge being fil- tered. A positive
value reduces blocking artifacts more, but will also smear details.
The second parameter is Beta (default: 0). This affects the
de- tail threshold. Very detailed blocks are not filtered, since the
smoothing caused by the filter would be more noticeable than the
original blocking.
The default behavior of the filter almost always achieves
opti- mal quality, so it is best to either leave it alone, or make on-
ly small adjustments. However, if your source material already has some
blocking or noise which you would like to remove, it may be a good idea
to turn it up a little bit.
