My attempt to archive a bluray disc:

1. `dd if=/dev/sr0 of=disc.img`
2. Use VLC and libaacs:
- extract video track without conversion to v.raw
- encode audio track to FLAC format -> a.flac

At this point, the whole disc is preserved bit by bit, and also the decrypted data is preserved in a lossless way.

Then I can mux them and transcode to any format with ffmpeg.

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