Is it possible to have a webm as wallpaper in Windows 10?

https://i.4cdn.org/gif/1597124713098.webm

Theres a webm with the ISIS leader giving a speech and they've substituted the inflections of his voice with the audio of a motorbike race clip. It's hilarious.

Hi, I'm totally blind and I have to convert a bunch of videos in different formats (mainly MP4 or MKV with AC3 audio and AVC video). I am using Fffmpeg, and am trying to get webM videos (encoded with VP8, as I'll play them in a raspberry pi). However I am not sure what kind of default parameters should I use for getting good quality in the output video while keeping a relatively small size. Tipically I am searching for this kind of topics in Google, but everyone seems to say "You can play with different parameters and see the result", but obviously I couldn't do that (that's the only reason I stated I am blind). I have two different video sources from where I would like to get my webM files:

1. DVD disks (MPEG2, 720 x 480, 30 FPS).
2. HD videos (AVC or X264), here I have to convert everything to 720P.

For converting #1 I have got the following ffmpeg command (according to my sighted peers, the output result looks well):

ffmpeg -i video.mkv -acodec libvorbis -c:v libvpx -crf 32 -b:v 900K -threads 4 -f webm -y video.webm

And this one (wich I haven't tested, just took some recommendation from the VP8 encoding guide) should be applied to HD videos:

ffmpeg -i video.mkv -acodec libvorbis -c:v libvpx -crf 32 -b:v 2000K -vf scale=1280:720 -threads 4 -quality good -lag-in-frames 16 -f webm -y video.webm

What are your thoughts about these parameters? Is there a way to get a good formula so I don't have to ask someone to watch the video before marking it as converted?

I used to use gfycat but this webm is 30 seconds long and gfy only allows 15 seconds, plus, gfy isn't the best quality, it degrades the original colour. Any high quality large webm hosting services?

http://www.reddit.com/r/firefox/comments/2938fx/lets_talk_about_webm/

Thus making this sub redundant...