On Sat, Aug 1, 2020 at 3:08 PM Carl Eugen Hoyos <ceffm...@gmail.com> wrote: > > Am Sa., 1. Aug. 2020 um 14:06 Uhr schrieb Jan Ekström <jee...@gmail.com>: > > > Additionally, the spec only mentions stereo/5.1 for direct mapping, so > > I've kept to 5.1 since we have the capability for that one. > > And you still believe it would be a disadvantage if the decoder outputs > this 5.1 mapping by default if nothing else was requested? >
Yes. API users so far have received the audio frames according to encoded layout by default, so doing something else breaks that rule of least surprises. > Is there an option to request the 5.1 mapping? > As noted in the 0/0 cover letter, you can do it just fine with `-channel_layout "5.1"` with ffmpeg.c. I have verified that it returns the 5.1 channels as-is. At this point I would not like to attempt to figure out how to skip channel coding units in the AAC decoder, as swresample seems to handle this nicely. So far the only usage for requested channel layout in aacdec has been to skip reordering with AV_CH_LAYOUT_NATIVE , to output the coded units as-is. Best regards, Jan _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
