Add 'ffmpeg.md'

ffmpeg.md

@@ -0,0 +1,10 @@
+## Playing with ffmpeg
+
+...to extrac, manipulate and reassmbly frames 
+
+### Frame extraction
+In running the command take note about original video fps
+```
+ffmpeg -i YDXJ0086.MP4 %04d.png
+
+```