The source: c:\01.WAV
620,398,844 bytes

ffmpeg^
 -i c:\01.WAV^
 -map 0^
 -c flac^
 "c:\Manual Goettsching [1992] E2-E4.flac.m4a"

Provoked: "Could not find tag for codec flac in stream #0, codec not currently 
supported in container".

ffmpeg^
 -i c:\01.WAV^
 -map 0^
 -c flac -compression_level 12^
 "c:\Manual Goettsching [1992] E2-E4.flac.mp4"
405,530,095 bytes

The above succeeded. It ran for a 3 or 4 minutes.

ffmpeg^
 -i c:\01.WAV^
 -map 0^
 -c flac^
 -compression_level 12^
 -lpc_type cholesky^
 -exact_rice_parameters 1^
 -multi_dim_quant 1^
 "c:\Manual Goettsching [1992] E2-E4.flac .mp4"

The above has been running for 43 minutes and has encoded 17 seconds of a 58 
minute audio.
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