Add command to make animated gifs.

tildocs/ffmpeg-wonder.markdown

@@ -8,8 +8,24 @@ ffmpeg -i file.webp file.jpg
 
 ---
 
-Compile a bunch of JPEGs to a slideshow movie:
+Compile a bunch of JPEGs to a slideshow movie
 
 ```
 ffmpeg -framerate 2 -pattern_type glob -i "DSC*.JPG" -c:v libx264 -vf "fps=25,format=yuv420p" out.mp4
 ```
+
+---
+
+[Convert a video file to an animated GIF](https://superuser.com/a/556031/309635)
+
+```
+ffmpeg -ss 383 -t 15 -i input.mp4 -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif
+```
+
+`-ss` means the timestamp in the video to start cutting, in seconds.
+
+`-t` is the length of the clip to cut. So this example cuts 15 seconds from the
+`383` second timestamp.
+
+`-loop` is a weird parameter. Check the link. But this one sets an infinite
+loop.