mpv: add page (#2314)

pages/common/mpv.md

@@ -0,0 +1,27 @@
+# mpv
+
+> A audio/video player based on MPlayer.
+
+- Play a video or audio file:
+
+`mpv {{file}}`
+
+- Jump backward/forward 5 seconds:
+
+`LEFT <or> RIGHT`
+
+- Jump backward/forward 1 minute:
+
+`DOWN <or> UP`
+
+- Decrease or increase playback speed by 10 %:
+
+`[ <or> ]`
+
+- Play a file at a specified speed (0.01 to 100, default 1):
+
+`mpv --speed {{speed}} {{file}}`
+
+- Play a file using a profile defined in the `mpv.conf` file:
+
+`mpv --profile {{profile_name}} {{file}}`