I extracted a mkv file from BDMV with MakeMKV, using this config. I only keep the main audio file.
The output mkv has the following tracks:
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:
title : Surround 5.0
BPS-eng : 1664621
DURATION-eng : 01:33:59.039995008
_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 #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
How can I properly extract and convert the audio track to 2.0 Opus? Thanks!