Bugzilla Bug 142342

The /usr/share/mime/packages/freedesktop.org.xml file in
shared-mime-info-0.17-r2 has an error in the MP4 section.

The offset attribute in the magic -> match entry should be 4, not 0.

<mime-type type="audio/mp4">
    <comment>MPEG-4 audio</comment>
    <comment xml:lang="bg">&#1040;&#1091;&#1076;&#1080;&#1086;
&#1092;&#1072;&#1081;&#1083;, &#1092;&#1086;&#1088;&#1084;&#1072;&#1090;
MPEG-4</comment>
    <comment xml:lang="de">MPEG-4-Audio</comment>
    <comment xml:lang="nb">MPEG-4-lyd</comment>
    <comment xml:lang="no">MPEG-4-lyd</comment>
    <alias type="audio/x-m4a"/>
    <magic priority="50">
<!-- WRONG:
      <match value="ftypM4A" type="string" offset="0"/>
-->
      <match value="ftypM4A" type="string" offset="4"/>
    </magic>
    <glob pattern="*.m4a"/>
  </mime-type>
  <mime-type type="video/mp4">

This already got fixed in 0.18 afaics, can you confirm that ? Might be a good
time to stabilize it.

It doesn't seem to be fixed in 0.18 (although there are some more
translations):

  <mime-type type="audio/mp4">
    <comment>MPEG-4 audio</comment>
    <comment xml:lang="bg">&#1040;&#1091;&#1076;&#1080;&#1086;,
&#1092;&#1086;&#1088;&#1084;&#1072;&#1090; MPEG-4</comment>
    <comment xml:lang="cs">Zvuk MPEG-4</comment>
    <comment xml:lang="de">MPEG-4-Audio</comment>
    <comment xml:lang="es">Audio MPEG-4</comment>
    <comment xml:lang="eu">MPEG-4 audioa</comment>
    <comment xml:lang="hu">MPEG-4-hang</comment>
    <comment xml:lang="it">Audio MPEG-4</comment>
    <comment xml:lang="ko">MPEG-4 &#50724;&#46356;&#50724;</comment>
    <comment xml:lang="nb">MPEG-4-lyd</comment>
    <comment xml:lang="nn">MPEG-4-lyd</comment>
    <comment xml:lang="sv">MPEG-4-ljud</comment>
    <comment xml:lang="uk">&#1047;&#1074;&#1091;&#1082; MPEG-4</comment>
    <comment xml:lang="vi">

It doesn't seem to be fixed in 0.18 (although there are some more
translations):

  <mime-type type="audio/mp4">
    <comment>MPEG-4 audio</comment>
    <comment xml:lang="bg">&#1040;&#1091;&#1076;&#1080;&#1086;,
&#1092;&#1086;&#1088;&#1084;&#1072;&#1090; MPEG-4</comment>
    <comment xml:lang="cs">Zvuk MPEG-4</comment>
    <comment xml:lang="de">MPEG-4-Audio</comment>
    <comment xml:lang="es">Audio MPEG-4</comment>
    <comment xml:lang="eu">MPEG-4 audioa</comment>
    <comment xml:lang="hu">MPEG-4-hang</comment>
    <comment xml:lang="it">Audio MPEG-4</comment>
    <comment xml:lang="ko">MPEG-4 &#50724;&#46356;&#50724;</comment>
    <comment xml:lang="nb">MPEG-4-lyd</comment>
    <comment xml:lang="nn">MPEG-4-lyd</comment>
    <comment xml:lang="sv">MPEG-4-ljud</comment>
    <comment xml:lang="uk">&#1047;&#1074;&#1091;&#1082; MPEG-4</comment>
    <comment xml:lang="vi">Âm thanh MPEG-4</comment>
    <alias type="audio/x-m4a"/>
    <magic priority="50">
      <match value="ftypM4A" type="string" offset="0"/>  <!---- Should be 4 -->
    </magic>
    <glob pattern="*.m4a"/>
  </mime-type>

I actually noticed this is wrong in the current freedesktop.org CVS:

http://webcvs.freedesktop.org/mime/shared-mime-info/freedesktop.org.xml.in?revision=1.155&view=markup

So I filed an upstream bug:

https://bugs.freedesktop.org/show_bug.cgi?id=7718

Would be nice to get it fixed quickly here though since it's such a trivial
change.

you are correct sir, I was mistakenly looking at the video/m4a bits.

fixen in 0.18-r1

thanks for the report & fix