Based on the Makefile variables, "make fate-audio" is supposed to include the tests for several audio codecs with their own Makefile.
loudnorm provides stats output that's meant to be used for two-pass normalization.
Fixes segfaults when handling files with odd chroma subsampled dimensions in some scenarios like using the hstack filter.
The sidebar allows multiple-selection, do DnD should also work.
I could not find any documentation which disallows the use of transparency for pixel formats other than YUV 4:2:0, so this patch adds support for transparency using 4:2:2, 4:4:4, RGB, and their high bit depth variants. It is not quite clear if the alpha channel should be encoded using the same pixel format as the normal channels, or it should be always YUV 4:2:0.