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tylerjenningsw
e675df7cab
The gains of an AAC source now come from the configuration FilmCraft decodes it with, read from MP4/MOV (esds), Matroska (CodecPrivate) and LATM in MPEG TS/PS (its first StreamMuxConfig). Channel configurations 3 to 6, 11 and 12 arrive reordered to WAVE order, 4 as L R C Cs, 7 in element order. A program config element goes by its element positions, except the six structures in which ffmpeg's encoder fills its own channel order across them (an LFE in a side SCE, a back centre in a side pair), recognised by its "Lavc" comment. ADTS can only signal configurations 1 to 7 that FilmCraft decodes, which the channel count tells apart. A decode of fewer channels than the layout keeps its first ones (7 of configuration 7's 8 in MPEG-TS LATM).