audio checker showing .m4a AAC lossy as lossless when converted to flac?? Can anybody please explain this anomaly
May 6, 2015 at 6:12 PM Thread Starter Post #1 of 2

cptbrewski

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Hi, I recently converted a .m4a ACC 256kbps lossy audio track to .flac lossless out of curiosity and strangely enough, spectrum diagram and audio checker report the file as lossless!
It looks like apple is using some great compression, I've also converted the same file from .m4a to mp3, then from .mp3 to flac and audio checker and spectro output as lossy.


Could somebody please explain this?
 
 
I'll be attaching a screenshot shortly.
 
May 6, 2015 at 7:07 PM Post #2 of 2

extrabigmehdi

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Your "audio checker" is probably using aucdtect.
This analyzer is mostly used to detect mp3 compression.
If a file is detected as lossless, it's still not a warranty that it's lossless.
If a file is detected as lossy, it doesn't mean it's necessarily lossy too.
If a track is low passed  by the artist, it would be detected as lossy.
It's a guess.
 
Try  to use accuraterip, if you have doubts about a rip.
I recommend the component "foo verifier" from foobar, for that.
 

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