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Re: File type for .m4a files

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In article <f349e2b05c.harriet@bazleyfamily.co.uk>,
   Harriet Bazley <harriet@bazleyfamily.co.uk> wrote:
> On 25 Feb 2026 as I do recall,
>           Bob Latham  wrote:

> I'm assuming the meta data is probably the same for the audio track
> in both cases... theoretically you could presumably inspect for the
> additional presence of video meta data and skip that file if so,
> but I imagine that would slow things down.

[Snip]

> Well, do you have any actual MP4 movie files?  If not, you could
> simply change the default icon to something more generic....

Please don't think I'm ungrateful for your help in finding a
solution, I do appreciate your input.

In the PC + NAS world, I think .m4a files are unique to music files
and contain no video. If as we move from that world to RISCOS we
obliterate that distinction then we have information loss. That
distinction may then have to be tested for, which as you pointed out
will slow things down.

I think I'm going for a unique mapping either &0B7 or &A62 I've just
not 100% certain which is best to go for. What confuses the issue for
me is another line in that article that says..

"A new filetype A62 (ADTS) was defined for .aac files (AAC
encapsulated in ADTS frames)."

Am I then likely at some point to encounter .aac files which give me
another issue? At least 0B7 is not allocated to another filetype.

Cheers,

Bob.

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Thread

File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-02-24 11:57 +0000
  Re: File type for .m4a files Jean-Michel <jmc.bruck@orange.fr> - 2026-02-24 19:43 +0100
    Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-02-24 21:57 +0000
      Re: File type for .m4a files Jean-Michel <jmc.bruck@orange.fr> - 2026-02-24 23:39 +0100
        Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-02-25 10:07 +0000
          Re: File type for .m4a files Sebastian Barthel <naitsabes@freenet.de> - 2026-02-25 11:54 +0000
            Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-02-25 13:41 +0000
              Re: File type for .m4a files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2026-02-25 16:42 +0000
                Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-02-25 18:30 +0000
                Re: File type for .m4a files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2026-02-25 22:08 +0000
                Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-02-26 09:03 +0000
                Re: File type for .m4a files Sebastian Barthel <naitsabes@freenet.de> - 2026-02-26 13:53 +0000
                Re: File type for .m4a files David Higton <dave@davehigton.me.uk> - 2026-02-26 17:09 +0000
                Re: File type for .m4a files Steve Fryatt <news@stevefryatt.org.uk> - 2026-02-26 23:27 +0000
                Re: File type for .m4a files Jean-Michel <jmc.bruck@orange.fr> - 2026-02-27 08:38 +0100
                Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-03-04 11:14 +0000
                Re: File type for .m4a files Chris Newman <mec@npost.uk> - 2026-03-04 13:08 +0000
                Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-03-04 17:52 +0000
  Re: File type for .m4a files David Higton <dave@davehigton.me.uk> - 2026-02-25 20:09 +0000
    Re: File type for .m4a files Bob Latham <bob@sick-of-spam.invalid> - 2026-02-25 22:09 +0000
    Re: File type for .m4a files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2026-02-25 22:09 +0000

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