How to add a new mime type for specific extension?

Support
1

I follow the steps Here.

This is my m3u.xml file

<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
  <mime-type type="video/m3u">
    <sub-class-of type="video/mp4"/>
    <glob pattern="*.m3u"/>
    <comment>m3u file</comment>
  </mime-type>
</mime-info>

After I run command update-mime-database ~/.local/share/mime/.
Seems not work.

> file -bL --mime-type pl.m3u                                      ─╯
text/plain

How to fix it?

2

It is my (very limited) understanding that file does not include file extensions in its tests to determine a file type. You may get something more like the result you are expecting from something like

xdg-mime query filetype pl.m3u

I also note that Wikipedia states that

An M3U file is a plain text file …

and

The only Internet media type registered for M3U and M3U8 is application/vnd.apple.mpegurl …

So I am curious as to what you hope to accomplish.

2 Likes
3

That is correct. file looks at the starting bytes of the file itself to determine what type of file it is.

That is correct as well. An .m3u filename suffix — note to the OP: “filename suffix”, not “extension”, which is a Microsoftism™ — is merely a convention that allows multimedia players to recognize the file as being a playlist.

It is indeed nothing other than a plain text file with a list of filespecs.

5 Likes
4

…and thus magic is forever removed from the equation…

1 Like
5

Any way to change the file type get by file command?

6

Yes — change the nature of the file. :stuck_out_tongue:

Look, perhaps we need to make it more clear to you. The command file reads the first couple of bytes of the target file and compares those to a database with “magic bytes”, which indicate which file it is.

An .m3u file does not have any “magic bytes” because it is a plain text file. And that is exactly how it should be regarded by the operating system. Tampering with this mechanism would be a security hazard.

1 Like
7

This seems like an xy problem. What are you trying to do?

3 Likes
8

I am 100% convinced that it is. :+1:

2 Likes
9

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