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M4A files not handled #14

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UnitedMarsupials-zz opened this issue Feb 5, 2017 · 3 comments
Open

M4A files not handled #14

UnitedMarsupials-zz opened this issue Feb 5, 2017 · 3 comments

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@UnitedMarsupials-zz
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Though the alacconvert-utility seems to handle CoreAudio (CAF) files fine, the M4A ALAC-files cause it to file:

% file c.m4a
c.m4a: ISO Media, Apple iTunes ALAC/AAC-LC (.M4A) Audio
% alacconvert c.m4a c.caf
Input file: c.m4a
Output file: c.caf
 Cannot determine what format file "c.m4a" is

The alac tool, originally by David Hammerton (now part of ffmpeg) used to work with just those files -- identified by the "M4A " magic-string at the beginning.

@M05QU170
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M05QU170 commented May 8, 2022

Why do you want convert from lossy format into lossless? You will not get any value from it just use space for no good reason.

@UnitedMarsupials
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Why do you want convert from lossy format into lossless?

Because there are devices, which don't understand the lossy format. Such as -- for just one example -- CD-players built into some (older) cars.

@M05QU170
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M05QU170 commented May 9, 2022

Oh my bad i haven't read it properly. Somehow i missed the part where you tried to convert m4a alac into caf. Million apologies

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