Retain all metadata

[hexadezi]

Conversion should retain all the metadata

[rodrigocfd]

How can I do this?

[hexadezi]

There are these libraries:
https://github.com/polyfloyd/rust-id3
https://github.com/jameshurst/rust-metaflac

Or use ffmpeg as converter.
ffmpeg -i input.flac -ab 320k -ac 2 -ar 44100 -joint_stereo 0 -map_metadata 0 -id3v2_version 3 output.mp3