Bitrate not changing

[pavelpoley]

Why is bitrate configuration is -sample_fmt and not -b:a ?

For example when I use FFmpegBitRate values nothing changes, the bitrate is always 64k.
If I use:
commandBuilder.addAll(listOf("-b:a", "320k"))
The bitrate is changing.

What should I do to change the bitrate without forking the repository and change it manually?