Update cheatsheets

mpv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mpv
+
+> A audio/video player based on MPlayer.
+> More information: <https://mpv.io>.
+
+- Play a video or audio from a URL or file:
+
+`mpv {{url|path/to/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> ]`
+
+- Take a screenshot of the current frame (saved to `./mpv-shotNNNN.jpg` by default):
+
+`s`
+
+- Play a file at a specified speed (1 by default):
+
+`mpv --speed {{0.01..100}} {{path/to/file}}`
+
+- Play a file using a profile defined in the `mpv.conf` file:
+
+`mpv --profile {{profile_name}} {{path/to/file}}`
+
+- Display the output of webcam or other video input device:
+
+`mpv /dev/{{video0}}`