从命令行设置默认视频播放器

Question

我想从命令行设置默认视频播放器。以xvideos为例，我试图通过更换到图腾的所有引用xvideos中defaults.list的文件：

mv /usr/share/applications/defaults.list /usr/share/applications/defaults.list.old.totem
sed 's/Totem/xvideos/' /usr/share/applications/defaults.list.old.totem > /usr/share/applications/defaults.list

这个文件的内容现在看起来像：

$ cat /usr/share/applications/defaults.list | grep xvideos
application/vnd.rn-realmedia=org.gnome.xvideos.desktop
application/x-extension-m4a=org.gnome.xvideos.desktop
application/x-extension-mp4=org.gnome.xvideos.desktop
application/x-matroska=org.gnome.xvideos.desktop
application/x-shockwave-flash=org.gnome.xvideos.desktop
audio/3gpp=org.gnome.xvideos.desktop
audio/ac3=org.gnome.xvideos.desktop
audio/AMR=org.gnome.xvideos.desktop
audio/AMR-WB=org.gnome.xvideos.desktop
audio/basic=org.gnome.xvideos.desktop
audio/midi=org.gnome.xvideos.desktop
audio/mp4=org.gnome.xvideos.desktop
audio/mpeg=org.gnome.xvideos.desktop
audio/mpegurl=org.gnome.xvideos.desktop
audio/prs.sid=org.gnome.xvideos.desktop
audio/vnd.rn-realaudio=org.gnome.xvideos.desktop
audio/x-ape=org.gnome.xvideos.desktop
audio/x-gsm=org.gnome.xvideos.desktop
audio/x-it=org.gnome.xvideos.desktop
audio/x-m4a=org.gnome.xvideos.desktop
audio/x-matroska=org.gnome.xvideos.desktop
audio/x-mod=org.gnome.xvideos.desktop
audio/x-ms-asf=org.gnome.xvideos.desktop
audio/x-ms-asx=org.gnome.xvideos.desktop
audio/x-ms-wax=org.gnome.xvideos.desktop
audio/x-ms-wma=org.gnome.xvideos.desktop
audio/x-musepack=org.gnome.xvideos.desktop
audio/x-pn-aiff=org.gnome.xvideos.desktop
audio/x-pn-au=org.gnome.xvideos.desktop
audio/x-pn-realaudio=org.gnome.xvideos.desktop
audio/x-pn-realaudio-plugin=org.gnome.xvideos.desktop
audio/x-pn-wav=org.gnome.xvideos.desktop
audio/x-pn-windows-acm=org.gnome.xvideos.desktop
audio/x-realaudio=org.gnome.xvideos.desktop
audio/x-real-audio=org.gnome.xvideos.desktop
audio/x-sbc=org.gnome.xvideos.desktop
audio/x-speex=org.gnome.xvideos.desktop
audio/x-tta=org.gnome.xvideos.desktop
audio/x-wav=org.gnome.xvideos.desktop
audio/x-wavpack=org.gnome.xvideos.desktop
audio/x-xm=org.gnome.xvideos.desktop
image/vnd.rn-realpix=org.gnome.xvideos.desktop
misc/ultravox=org.gnome.xvideos.desktop
video/3gpp=org.gnome.xvideos.desktop
video/dv=org.gnome.xvideos.desktop
video/fli=org.gnome.xvideos.desktop
video/flv=org.gnome.xvideos.desktop
video/mp2t=org.gnome.xvideos.desktop
video/mp4=org.gnome.xvideos.desktop
video/mp4v-es=org.gnome.xvideos.desktop
video/mpeg=org.gnome.xvideos.desktop
video/msvideo=org.gnome.xvideos.desktop
video/ogg=org.gnome.xvideos.desktop
video/quicktime=org.gnome.xvideos.desktop
video/vivo=org.gnome.xvideos.desktop
video/vnd.divx=org.gnome.xvideos.desktop
video/vnd.rn-realvideo=org.gnome.xvideos.desktop
video/vnd.vivo=org.gnome.xvideos.desktop
video/webm=org.gnome.xvideos.desktop
video/x-anim=org.gnome.xvideos.desktop
video/x-avi=org.gnome.xvideos.desktop
video/x-flc=org.gnome.xvideos.desktop
video/x-fli=org.gnome.xvideos.desktop
video/x-flic=org.gnome.xvideos.desktop
video/x-flv=org.gnome.xvideos.desktop
video/x-m4v=org.gnome.xvideos.desktop
video/x-matroska=org.gnome.xvideos.desktop
video/x-mpeg=org.gnome.xvideos.desktop
video/x-ms-asf=org.gnome.xvideos.desktop
video/x-ms-asx=org.gnome.xvideos.desktop
video/x-msvideo=org.gnome.xvideos.desktop
video/x-ms-wm=org.gnome.xvideos.desktop
video/x-ms-wmv=org.gnome.xvideos.desktop
video/x-ms-wmx=org.gnome.xvideos.desktop
video/x-ms-wvx=org.gnome.xvideos.desktop
video/x-nsv=org.gnome.xvideos.desktop
video/x-ogm+ogg=org.gnome.xvideos.desktop
video/x-theora+ogg=org.gnome.xvideos.desktop
video/x-totem-stream=org.gnome.xvideos.desktop
x-content/video-dvd=org.gnome.xvideos.desktop
x-content/video-vcd=org.gnome.xvideos.desktop
x-content/video-svcd=org.gnome.xvideos.desktop

但是，默认情况下仍然使用 Totem 打开视频，例如，如果我双击文件管理器中的电影文件。

这还能如何实现？

Answer 1

经过大约一个小时的摆弄后，我得到了这个工作，我运行的是 Ubuntu 16.04.1，我没有xvideos安装 vlc，所以你可以尝试简单地替换vlc你选择的播放器。
这是我在提示符下运行的命令

% sed -n '
1i[Default Applications]
/^video/{
s/Totem/vlc/
s/org\.gnome\.//p
}' /usr/share/applications/defaults.list > ~/.local/share/applications/defaults.list

运行上面的命令会产生

% cat ~/.local/share/applications/defaults.list
[Default Applications]
video/3gpp=vlc.desktop
video/dv=vlc.desktop
video/fli=vlc.desktop
video/flv=vlc.desktop
video/mp2t=vlc.desktop
video/mp4=vlc.desktop
video/mp4v-es=vlc.desktop
video/mpeg=vlc.desktop
video/msvideo=vlc.desktop
video/ogg=vlc.desktop
video/quicktime=vlc.desktop
video/vivo=vlc.desktop
video/vnd.divx=vlc.desktop
video/vnd.rn-realvideo=vlc.desktop
video/vnd.vivo=vlc.desktop
video/webm=vlc.desktop
video/x-anim=vlc.desktop
video/x-avi=vlc.desktop
video/x-flc=vlc.desktop
video/x-fli=vlc.desktop
video/x-flic=vlc.desktop
video/x-flv=vlc.desktop
video/x-m4v=vlc.desktop
video/x-matroska=vlc.desktop
video/x-mpeg=vlc.desktop
video/x-ms-asf=vlc.desktop
video/x-ms-asx=vlc.desktop
video/x-msvideo=vlc.desktop
video/x-ms-wm=vlc.desktop
video/x-ms-wmv=vlc.desktop
video/x-ms-wmx=vlc.desktop
video/x-ms-wvx=vlc.desktop
video/x-nsv=vlc.desktop
video/x-ogm+ogg=vlc.desktop
video/x-theora+ogg=vlc.desktop
video/x-totem-stream=vlc.desktop

现在转到 nautilus 并双击mp4它在其中启动的文件vlc。我不需要点击F5或注销，似乎~/.local/share/applications/defaults.list每次调用都会读取。

参考 - https://unix.stackexchange.com/a/41196/106525