I extracted a mkv file from BDMV with MakeMKV, using this config. I only keep the main audio file.

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The output mkv has the following tracks:

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How can it be 5.0 when the cover says 2.0 stereo? bluray.com also confirms that my disc has a 2.0 DTS MA track.

And when I try to convert it to Opus, using this command

ffmpeg -i title00.mka -acodec libopus -b:a 510000 out.opus

It gave me a channel mapping error:

Metadata: title : Surround 5.0 BPS-eng : 1664621 DURATION-eng : 01:33:59.039995008 NUMBER_OF_FRAMES-eng: 528660 NUMBER_OF_BYTES-eng: 1173358176 _STATISTICS_WRITING_APP-eng: mkvmerge v27.0.0 ('Metropolis') 64-bit _STATISTICS_WRITING_DATE_UTC-eng: 2018-10-12 08:39:46 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES File 'out.opus' already exists. Overwrite ? [y/N] y Stream mapping: Stream #0:0 -> #0:0 (dts (dca) -> opus (libopus)) Press [q] to stop, [?] for help [libopus @ 0x7fc1f8026600] Invalid channel layout 5.0(side) for specified mapping family -1. Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height Conversion failed!

How can I properly extract and convert the audio track to 2.0 Opus? Thanks!

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