Gets or sets the filtering flags. This enumeration supports a bitwise combination of its member values. If a single filter is chosen, then that filter will be used for every row. If multiple filters are chosen, then a heuristic will be used to guess which filter will encode smallest, then apply that filter. This happens on a per row basis, different rows can use different filters. Using a single filter (or less filters) is typically faster. Trying all of the filters may help minimize the output file size. The default value is AllFilters.