General WebM creation thread.

Tips and Tricks are welcome.

Some useful tools can you find here:

https://github.com/Kagami/webm.py/wiki/Related-links

For Linux I recommend pure ffmpeg or the webm.py tool.

On Windows you should use the WebMConverter.

https://gitgud.io/nixx/WebMConverter

Additional information:

Max filesize is 50MB

No .mp4 allowed, this is a .webm board.

Example ffmpeg lines:

For vp8 I would use this, you can change the bitrate to whatever you like, the higher it gets the bigger the file will be.

ffmpeg -i INPUT.mp4 -c:v libvpx -crf 12 -b:v 1000K -vf scale=720:-1 OUTPUT.webm

For vp9 I am using webm.py and a sample line looks like this:

ffmpeg -hide_banner -i INPUT.mp4 -pass 2 -passlogfile /tmp/tmpr3a1apey -sn -c:v libvpx-vp9 -speed 1 -tile-columns 6 -frame-parallel 0 -b:v 808.3k -threads 4 -auto-alt-ref 1 -lag-in-frames 25 -pix_fmt +yuv420p -ac 2 -c:a libopus -b:a 64k -f webm -y OUTPUT.webm

// UserScript
// @name endchan webm loop
// @namespace jkhsjdhjs
// @include http://endchan.xyz*
// @include https://endchan.xyz*
// @version 2
// @grant none
// /UserScript

function addLoopAttribute() {
	document.querySelectorAll('video').forEach(function(v) {
		v.setAttribute('loop', '');
	})
}

if(document.readyState == 'complete') {
	addLoopAttribute()
} else {
	document.addEventListener('DOMContentLoaded', addLoopAttribute)
}