Update cheatsheets

ffplay

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ffplay
+
+> A simple and portable media player using the FFmpeg libraries and the SDL library.
+> More information: <https://ffmpeg.org/ffplay-all.html>.
+
+- Play a media file:
+
+`ffplay {{path/to/file}}`
+
+- Play audio from a media file without a GUI:
+
+`ffplay -nodisp {{path/to/file}}`
+
+- Play media passed by `ffmpeg` through `stdin`:
+
+`ffmpeg -i {{path/to/file}} -c {{copy}} -f {{media_format}} - | ffplay -`
+
+- Play a video and show motion vectors in real time:
+
+`ffplay -flags2 +export_mvs -vf codecview=mv=pf+bf+bb {{path/to/file}}`
+
+- Show only video keyframes:
+
+`ffplay -vf select="{{eq(pict_type\,PICT_TYPE_I)}}" {{path/to/file}}`