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.
