v6.338.1 This release fixes a number of minor issues with v6.338.0, as well as a major regression of the frame mixing code. Fixes and performance enhancements: - fix H.274 grain database PRNG - fix compilation on FreeBSD - fix unnatural peak detection flicker on mostly black samples - fix plplay 'Use detected luminance' checkbox - fix unnecessary recompilation when changing antiring strength - properly disable anti-ringing for non-negative filters - fix double-callback on sliced texture uploads - dispatch callback slightly sooner in pointer texture upload fallback - slightly improve saturation when tone mapping by large factors - various improvements to the benchmark - fix regression when frame mixing low FPS sources - update various misleading comments