Converting to AAC 5.1 / 7.1 with ffmpeg changes channel layout

[vash1]

Hi guys,

When converting DTS HD-MA or multichannel FLAC to AAC with the latest ffmpeg 4.1.3 I get channel layout that mismatch source audio file.

This happens for 5.1 and 7.1 audios.

The command I use is the simplest one:

ffmpeg -i 7.1.flac 7.1.aac

ffmpeg -i 5.1.dts 5.1.aac

The source and destination layouts looks like the following:

L R C LFE Lb Rb Ls Rs <-- 7.1.flac
C L R Ls Rs Lb Rb LFE <-- 7.1.aac

C L R Ls Rs LFE <-- 5.1.dts
L R C Cb Lb Rb <-- 5.1.aac

Please kindly assist.

[pandy]

Sounds like serious regression for ffmpeg.
Try to restore proper order with https://ffmpeg.org/ffmpeg-filters.html#channelmap
Check channel layout for source and for target.