[Libav-user] ALAC codec I am not sure it's really lossless

[kurdy]

Hi,

I did some conversions from flac to m4a using alac codec the output file was
so small I did following test:

>From a flac file I did avconv -i f.flac -acodec alac f.m4a
then back to flac  avconv -i f.m4a -acodec flac f.flac

after using metaflac tools I checked parameters like md5 and some other
values and  there are different. 

I did the same using aiff as output format and everything is OK.

Is alac codec really lossless ? 
or 
Is my tests which are not significant ?


Thanks for advice



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