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6 <title>Petter Reinholdtsen: entries from June
2016</title>
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15 <a href=
"https://people.skolelinux.org/pere/blog/">Petter Reinholdtsen
</a>
22 <h3>Entries from June
2016.
</h3>
26 <a href=
"https://people.skolelinux.org/pere/blog/The_new__best__multimedia_player_in_Debian_.html">The new "best" multimedia player in Debian?
</a>
32 <p>When I set out a few weeks ago to figure out
33 <a href=
"http://people.skolelinux.org/pere/blog/What_is_the_best_multimedia_player_in_Debian_.html">which
34 multimedia player in Debian claimed to support most file formats /
35 MIME types
</a>, I was a bit surprised how varied the sets of MIME types
36 the various players claimed support for. The range was from
55 to
130
37 MIME types. I suspect most media formats are supported by all
38 players, but this is not really reflected in the MimeTypes values in
39 their desktop files. There are probably also some bogus MIME types
40 listed, but it is hard to identify which one this is.
</p>
42 <p>Anyway, in the mean time I got in touch with upstream for some of
43 the players suggesting to add more MIME types to their desktop files,
44 and decided to spend some time myself improving the situation for my
45 favorite media player VLC. The fixes for VLC entered Debian unstable
46 yesterday. The complete list of MIME types can be seen on the
47 <a href=
"https://wiki.debian.org/DebianMultimedia/PlayerSupport">Multimedia
48 player MIME type support status
</a> Debian wiki page.
</p>
50 <p>The new "best" multimedia player in Debian? It is VLC, followed by
51 totem, parole, kplayer, gnome-mpv, mpv, smplayer, mplayer-gui and
52 kmplayer. I am sure some of the other players desktop files support
53 several of the formats currently listed as working only with vlc,
56 <p>A sad observation is that only
14 MIME types are listed as
57 supported by all the tested multimedia players in Debian in their
58 desktop files: audio/mpeg, audio/vnd.rn-realaudio, audio/x-mpegurl,
59 audio/x-ms-wma, audio/x-scpls, audio/x-wav, video/mp4, video/mpeg,
60 video/quicktime, video/vnd.rn-realvideo, video/x-matroska,
61 video/x-ms-asf, video/x-ms-wmv and video/x-msvideo. Personally I find
62 it sad that video/ogg and video/webm is not supported by all the media
63 players in Debian. As far as I can tell, all of them can handle both
70 Tags:
<a href=
"https://people.skolelinux.org/pere/blog/tags/debian">debian
</a>,
<a href=
"https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu
</a>,
<a href=
"https://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia
</a>,
<a href=
"https://people.skolelinux.org/pere/blog/tags/video">video
</a>.
75 <div class=
"padding"></div>
79 <a href=
"https://people.skolelinux.org/pere/blog/A_program_should_be_able_to_open_its_own_files_on_Linux.html">A program should be able to open its own files on Linux
</a>
85 <p>Many years ago, when koffice was fresh and with few users, I
86 decided to test its presentation tool when making the slides for a
87 talk I was giving for NUUG on Japhar, a free Java virtual machine. I
88 wrote the first draft of the slides, saved the result and went to bed
89 the day before I would give the talk. The next day I took a plane to
90 the location where the meeting should take place, and on the plane I
91 started up koffice again to polish the talk a bit, only to discover
92 that kpresenter refused to load its own data file. I cursed a bit and
93 started making the slides again from memory, to have something to
94 present when I arrived. I tested that the saved files could be
95 loaded, and the day seemed to be rescued. I continued to polish the
96 slides until I suddenly discovered that the saved file could no longer
97 be loaded into kpresenter. In the end I had to rewrite the slides
98 three times, condensing the content until the talk became shorter and
99 shorter. After the talk I was able to pinpoint the problem
–
100 kpresenter wrote inline images in a way itself could not understand.
101 Eventually that bug was fixed and kpresenter ended up being a great
102 program to make slides. The point I'm trying to make is that we
103 expect a program to be able to load its own data files, and it is
104 embarrassing to its developers if it can't.
</p>
106 <p>Did you ever experience a program failing to load its own data
107 files from the desktop file browser? It is not a uncommon problem. A
108 while back I discovered that the screencast recorder
109 gtk-recordmydesktop would save an Ogg Theora video file the KDE file
110 browser would refuse to open. No video player claimed to understand
111 such file. I tracked down the cause being
<tt>file --mime-type
</tt>
112 returning the application/ogg MIME type, which no video player I had
113 installed listed as a MIME type they would understand. I asked for
114 <a href=
"http://bugs.gw.com/view.php?id=382">file to change its
115 behavour
</a> and use the MIME type video/ogg instead. I also asked
116 several video players to add video/ogg to their desktop files, to give
117 the file browser an idea what to do about Ogg Theora files. After a
118 while, the desktop file browsers in Debian started to handle the
119 output from gtk-recordmydesktop properly.
</p>
121 <p>But history repeats itself. A few days ago I tested the music
122 system Rosegarden again, and I discovered that the KDE and xfce file
123 browsers did not know what to do with the Rosegarden project files
124 (*.rg). I've reported
<a href=
"http://bugs.debian.org/825993">the
125 rosegarden problem to BTS
</a> and a fix is commited to git and will be
126 included in the next upload. To increase the chance of me remembering
127 how to fix the problem next time some program fail to load its files
128 from the file browser, here are some notes on how to fix it.
</p>
130 <p>The file browsers in Debian in general operates on MIME types.
131 There are two sources for the MIME type of a given file. The output from
132 <tt>file --mime-type
</tt> mentioned above, and the content of the
133 shared MIME type registry (under /usr/share/mime/). The file MIME
134 type is mapped to programs supporting the MIME type, and this
135 information is collected from
136 <a href=
"https://www.freedesktop.org/wiki/Specifications/desktop-entry-spec/">the
137 desktop files
</a> available in /usr/share/applications/. If there is
138 one desktop file claiming support for the MIME type of the file, it is
139 activated when asking to open a given file. If there are more, one
140 can normally select which one to use by right-clicking on the file and
141 selecting the wanted one using 'Open with' or similar. In general
142 this work well. But it depend on each program picking a good MIME
144 <a href=
"http://www.iana.org/assignments/media-types/media-types.xhtml">a
145 MIME type registered with IANA
</a>), file and/or the shared MIME
146 registry recognizing the file and the desktop file to list the MIME
147 type in its list of supported MIME types.
</p>
149 <p>The
<tt>/usr/share/mime/packages/rosegarden.xml
</tt> entry for
150 <a href=
"http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec">the
151 Shared MIME database
</a> look like this:
</p>
154 <?xml
version="
1.0"
encoding="UTF-
8"?
>
155 <mime-info
xmlns="http://www.freedesktop.org/standards/shared-mime-info"
>
156 <mime-type
type="audio/x-rosegarden"
>
157 <sub-class-of
type="application/x-gzip"/
>
158 <comment
>Rosegarden project file
</comment
>
159 <glob
pattern="*.rg"/
>
162 </pre></blockquote></p>
164 <p>This states that audio/x-rosegarden is a kind of application/x-gzip
165 (it is a gzipped XML file). Note, it is much better to use an
166 official MIME type registered with IANA than it is to make up ones own
167 unofficial ones like the x-rosegarden type used by rosegarden.
</p>
169 <p>The desktop file of the rosegarden program failed to list
170 audio/x-rosegarden in its list of supported MIME types, causing the
171 file browsers to have no idea what to do with *.rg files:
</p>
174 % grep Mime /usr/share/applications/rosegarden.desktop
175 MimeType=audio/x-rosegarden-composition;audio/x-rosegarden-device;audio/x-rosegarden-project;audio/x-rosegarden-template;audio/midi;
176 X-KDE-NativeMimeType=audio/x-rosegarden-composition
178 </pre></blockquote></p>
180 <p>The fix was to add "audio/x-rosegarden;" at the end of the
183 <p>If you run into a file which fail to open the correct program when
184 selected from the file browser, please check out the output from
185 <tt>file --mime-type
</tt> for the file, ensure the file ending and
186 MIME type is registered somewhere under /usr/share/mime/ and check
187 that some desktop file under /usr/share/applications/ is claiming
188 support for this MIME type. If not, please report a bug to have it
195 Tags:
<a href=
"https://people.skolelinux.org/pere/blog/tags/debian">debian
</a>,
<a href=
"https://people.skolelinux.org/pere/blog/tags/english">english
</a>.
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10)
</a></li>
483 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2013/07/">July (
7)
</a></li>
485 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2013/08/">August (
3)
</a></li>
487 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2013/09/">September (
5)
</a></li>
489 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2013/10/">October (
7)
</a></li>
491 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2013/11/">November (
9)
</a></li>
493 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2013/12/">December (
3)
</a></li>
500 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/01/">January (
7)
</a></li>
502 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/02/">February (
10)
</a></li>
504 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/03/">March (
17)
</a></li>
506 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/04/">April (
12)
</a></li>
508 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/05/">May (
12)
</a></li>
510 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/06/">June (
20)
</a></li>
512 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/07/">July (
17)
</a></li>
514 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/08/">August (
6)
</a></li>
516 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/09/">September (
9)
</a></li>
518 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/10/">October (
17)
</a></li>
520 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/11/">November (
10)
</a></li>
522 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2012/12/">December (
7)
</a></li>
529 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/01/">January (
16)
</a></li>
531 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/02/">February (
6)
</a></li>
533 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/03/">March (
6)
</a></li>
535 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/04/">April (
7)
</a></li>
537 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/05/">May (
3)
</a></li>
539 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/06/">June (
2)
</a></li>
541 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/07/">July (
7)
</a></li>
543 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/08/">August (
6)
</a></li>
545 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/09/">September (
4)
</a></li>
547 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/10/">October (
2)
</a></li>
549 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/11/">November (
3)
</a></li>
551 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2011/12/">December (
1)
</a></li>
558 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/01/">January (
2)
</a></li>
560 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/02/">February (
1)
</a></li>
562 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/03/">March (
3)
</a></li>
564 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/04/">April (
3)
</a></li>
566 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/05/">May (
9)
</a></li>
568 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/06/">June (
14)
</a></li>
570 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/07/">July (
12)
</a></li>
572 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/08/">August (
13)
</a></li>
574 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/09/">September (
7)
</a></li>
576 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/10/">October (
9)
</a></li>
578 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/11/">November (
13)
</a></li>
580 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2010/12/">December (
12)
</a></li>
587 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/01/">January (
8)
</a></li>
589 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/02/">February (
8)
</a></li>
591 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/03/">March (
12)
</a></li>
593 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/04/">April (
10)
</a></li>
595 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/05/">May (
9)
</a></li>
597 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/06/">June (
3)
</a></li>
599 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/07/">July (
4)
</a></li>
601 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/08/">August (
3)
</a></li>
603 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/09/">September (
1)
</a></li>
605 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/10/">October (
2)
</a></li>
607 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/11/">November (
3)
</a></li>
609 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2009/12/">December (
3)
</a></li>
616 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2008/11/">November (
5)
</a></li>
618 <li><a href=
"https://people.skolelinux.org/pere/blog/archive/2008/12/">December (
7)
</a></li>
629 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (
19)
</a></li>
631 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/amiga">amiga (
1)
</a></li>
633 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/aros">aros (
1)
</a></li>
635 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/bankid">bankid (
4)
</a></li>
637 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (
9)
</a></li>
639 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (
12)
</a></li>
641 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (
17)
</a></li>
643 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/bsa">bsa (
2)
</a></li>
645 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (
3)
</a></li>
647 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/debian">debian (
197)
</a></li>
649 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (
159)
</a></li>
651 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (
9)
</a></li>
653 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/digistan">digistan (
11)
</a></li>
655 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/dld">dld (
18)
</a></li>
657 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/docbook">docbook (
32)
</a></li>
659 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (
4)
</a></li>
661 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/english">english (
455)
</a></li>
663 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (
23)
</a></li>
665 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (
14)
</a></li>
667 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (
34)
</a></li>
669 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (
9)
</a></li>
671 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (
20)
</a></li>
673 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/h264">h264 (
20)
</a></li>
675 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/intervju">intervju (
43)
</a></li>
677 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (
16)
</a></li>
679 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/kart">kart (
23)
</a></li>
681 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/kodi">kodi (
6)
</a></li>
683 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/ldap">ldap (
9)
</a></li>
685 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/lego">lego (
5)
</a></li>
687 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/lenker">lenker (
8)
</a></li>
689 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/linuxcnc">linuxcnc (
5)
</a></li>
691 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (
2)
</a></li>
693 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (
1)
</a></li>
695 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/madewithcc">madewithcc (
3)
</a></li>
697 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (
8)
</a></li>
699 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (
46)
</a></li>
701 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (
15)
</a></li>
703 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/noark5">noark5 (
24)
</a></li>
705 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/norsk">norsk (
323)
</a></li>
707 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/nuug">nuug (
198)
</a></li>
709 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (
40)
</a></li>
711 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/open311">open311 (
2)
</a></li>
713 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/opensnitch">opensnitch (
4)
</a></li>
715 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (
75)
</a></li>
717 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/personvern">personvern (
114)
</a></li>
719 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/raid">raid (
2)
</a></li>
721 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/reactos">reactos (
1)
</a></li>
723 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/reprap">reprap (
11)
</a></li>
725 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/rfid">rfid (
3)
</a></li>
727 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/robot">robot (
17)
</a></li>
729 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/rss">rss (
1)
</a></li>
731 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/ruter">ruter (
7)
</a></li>
733 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (
2)
</a></li>
735 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (
60)
</a></li>
737 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (
4)
</a></li>
739 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (
5)
</a></li>
741 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/standard">standard (
75)
</a></li>
743 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (
7)
</a></li>
745 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (
14)
</a></li>
747 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (
65)
</a></li>
749 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (
5)
</a></li>
751 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/usenix">usenix (
2)
</a></li>
753 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/valg">valg (
9)
</a></li>
755 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (
21)
</a></li>
757 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/video">video (
80)
</a></li>
759 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (
4)
</a></li>
761 <li><a href=
"https://people.skolelinux.org/pere/blog/tags/web">web (
42)
</a></li>
767 <p style=
"text-align: right">
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