Wualacleaner: process video files correctly

[jeroendoggen]

Convert video's to a thumbnail.
https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video

Or a lowres h264 file
https://trac.ffmpeg.org/wiki/Encode/H.264
Example:
ffmpeg -i vid.AVI -c:v libx264 -preset slow -s 320x240 -b:v 250k output2.mkv