linuxgeek: Re: [LINUX_Newbies] mp3 transcoding

On 02/08/2011 01:42 PM, Chris Becker wrote:
> Just fyi, I'm pretty sure m4a is the iphone/itunes format. At least, voice
> memos my wife sends me, recorded from her iphone, are .m4a. Otherwise, I
> don't have anything to add to What Roy said... cheers~

MP3 is MPEG layer 3 -- in other words, the audio compression scheme used
in MPEG1. M4A (and AAS) is the audio compression scheme used in MPEG4.
M4A means MPEG4 Audio. It seems to be a more efficient compression scheme.

I have seen other versions -- M4x, where x is some other letter -- that
are encrypted.

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