file format
I downloaded a few audio files in m4a format from youtube using flashgot plugin in firefox.
The files are showing up as unknown, they don't open on double click. I have to manually right click and select Rhythmbox or VLC everytime to play these files. I also tried adding .m4a after the filename, still doesn't work.
I am using 14.10 on dell n5010
Is a feature-rich and complete software application to manage CD/DVD images. Thanks to powerful open source tools such as fuseiso, AcetoneISO will let You mount typical proprietary images formats of the Windows world such as ISO BIN NRG MDF IMG and do plenty of other things.
sudo apt-get install acetoneiso
This answer is adapted from Ondra Žižka's answer here: How do I set the default program?. Please upvote there as well if this helps you.
To change the default program for files with a specific file type, a mime type needs to be created for each file extension. This is because Ubuntu tracks this indirectly:
For Ubuntu (18.x), the following applies:
This is determined from files in /usr/share/mime/packages/.
E.g.:
cat << EOF | sudo tee /usr/share/mime/packages/staruml.xml
<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
<mime-type type="application/staruml-project">
<comment>StarUML project</comment>
<glob pattern="*.MDJ"/>
<glob pattern="*.mdj"/>
</mime-type>
</mime-info>
EOF
Other xml files are generated from these and placed in /usr/share/mime/. Sometimes these files may be found online, especially for open source software packaged for Ubuntu. For example, the mime files for KiCad can be found in the KiCad source code repository: https://gitlab.com/kicad/code/kicad/-/tree/master/resources/linux/mime
This is driven by ~/.config/mimeapps.list or possibly ~/.local/share/applications/mimeapps.list. This should override /usr/share/applications/mimeapps.list. For example:
echo 'application/staruml=staruml.desktop' | tee -a ~/.local/share/applications/mimeapps.list
Or, to change for all users:
echo 'application/staruml=staruml.desktop' | sudo tee -a /usr/share/applications/mimeapps.list
This is driven by the .desktop files in /usr/share/applications/. That file can contain a MimeType= entry with semicolon-separated list of MIME types. For instance, the EOG app has MimeType=image/bmp;image/gif;image/jpeg;image/jpg;....
cat << EOF | sudo tee /usr/share/applications/staruml.desktop
[Desktop Entry]
Name=StarUML
Comment=StarUML
GenericName=StarUML
Exec=/sw/prog/StarUML/StarUML-3.1.0-x86_64.AppImage %U
Icon=/sw/prog/StarUML/staruml.png
Type=Application
StartupNotify=false
Categories=Development;Programming;Modeling;UML
MimeType=application/staruml-project;
EOF
This makes it a full circle. The changes take effect after running
sudo update-mime-database /usr/share/mime
and, for icons,
sudo gtk-update-icon-cache /usr/share/icons/gnome -f
Or, you may need to logout/login.
Then, mimetypes for a given file extension can be checked using mimetype:
$ mimetype .mdj
.mdj: application/staruml-project
References:
Credit: Ondra Žižka (Adapted)
Best Answer
Check your M4A file with this command:
The output should look something like this:
If this is so, then you are missing the codec
ubuntu-restricted-extras.Install the package with this command:
Then try again.