On 09-06-2025 01:30, Mark Filipak wrote:
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.
If you want lossless encoding in a m4a container, you should use ALAC
instead of FLAC. (m4a does not support flac as is correctly stated by
FFmpeg, mp4 officially also does not support FLAC, but apparently it can
somehow be fitted in...)
However I found (by encoding multiple audio files with both encoders)
that FLAC is more efficient than ALAC (both faster and better
compression) and FLAC has much more versatile metadata support.
Use FLAC's own container, or matroska for full support of the format.
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