[maemo-users] Tagging mp4/m4a music files for N900

[From: Fernando Cassia]

On Tue, May 11, 2010 at 1:56 AM, Paul Hartman
<paul.hartman+maemo at gmail.com> wrote:
> Hi,
>
> I have a large collection of mp4 music files that were taged with
> nokiatagger [1] for use on my N95. These files play on the N900 (when
> renamed to m4a, see bug 8846) but the tags are not read.
>
> I tried tagging the files with EasyTag [2] which apparently uses the
> MP4-AAC tag format, but then the files cannot be played by the N900 at
> all.
>
> What tag format does N900 use for mp4/m4a music files, if any? Is
> there any existing tagging program that supports it?

Paul,

MP3 files use ID3 tags (or ID3v2). MP4/M4A files use either
proprietary Applet tags

The full issue is discussed here
http://www.hydrogenaudio.org/forums/lofiversion/index.php/t32063.html

"Apple has pretty much defined the standard for MPEG-4 AAC tags with
their iTunes tagging format for AAC. I don't even know if you can call
it a standard since no official specifications for the tags have been
released by Apple. MPEG-4 AAC just didn't have any tagging format so
Apple created one."

"Everybody uses Apple's tags nowadays. There is mpeg-7 which defines
real metadata in mp4 but nobody uses it. "

AAC Tagging info
http://www.hydrogenaudio.org/forums/index.php?showtopic=29120&st=0&p=251686&#entry251686

I think you best chance is using a PC based program to do your
tagging, one that supports both ID3 on MP3 and AAC tags like this one:
http://users.otenet.gr/~dtou20/

Hope this helps (or at least helps understand the problem). :)

If not, sorry.
FC
PS: I don´t own a N900, just wanted to help.