A Python tool to recursively transcode a directory of audio files to the Opus format whilst preserving directory structure.

Current features:

• Recurse until a 'max depth' parameter (or infinitely)
• Preserve directory structure
• Process scheduler

Supported formats:

Input:

• .m4a (ALAC)
• .flac (FLAC)

Output:

• .opus (Opus)

It uses ffmpeg as a back-end, so make sure you have it installed and your version has the required decoders and encoders.

You can download it here.