add ffmpeg page

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diff --git a/src/misc/ffmpeg/index.md b/src/misc/ffmpeg/index.md
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+---
+title: FFmpeg Cheat Sheet
+date: February 3, 2025
+description: Random ffmpeg incantations I find useful
+---
+
+Apply a gaussian blur:
+
+```bash
+ffmpeg -i in.mp4  -vf 'gblur=sigma=20:steps=5' -c:a copy out.mp4
+```
+
+Create a video from an audio file and still image:
+
+```bash
+ffmpeg -loop 1 -i image.jpg -i audio.m4a -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest out.mp4
+```
+
+Crop 200px from the bottom of a video, maintaining aspect ratio:
+
+```bash
+ffmpeg -i in.mp4 -filter:v 'crop=iw-200:ih-200:(iw-ow)/2:0' -c:a copy out.mp4
+```