user11230: Let's say that I have a webm of XMB, and I want to resize it to 2MB in order too upload it to some websites. How can I do it?
Is there a website? Can I downsize them in mass?

user1871: Use Avanti with ffmpeg. The former has a job control manager where you drop in multiple files at once and go. You can find webm encoding guide for ffmpeg here: http://trac.ffmpeg.org/wiki/Encode/VP8
Use crf mode encoding and experiment till you get desired size. Set b:v high like 10M and tweak CRF value and if you have no audio, use -an in place of -c:a libvorbis.
Your Avanti GUI should look like this: 

Change the crf number (30 in that pic) till you get the size you want.

11230: <p>Let's say that I have a webm of XMB, and I want to resize it to 2MB in order too upload it to some websites. How can I do it?
Is there a website? Can I downsize them in mass?</p>
 1871: <p>Use <a href="http://avanti.arrozcru.org/" rel="nofollow noreferrer">Avanti</a> with <a href="https://www.ffmpeg.org/" rel="nofollow noreferrer">ffmpeg</a>. The former has a job control manager where you drop in multiple files at once and go. You can find webm encoding guide for ffmpeg here: <a href="http://trac.ffmpeg.org/wiki/Encode/VP8" rel="nofollow noreferrer">http://trac.ffmpeg.org/wiki/Encode/VP8</a></p>

<p>Use crf mode encoding and experiment till you get desired size. Set <code>b:v</code> high like <code>10M</code> and tweak <code>CRF value</code> and if you have no audio, use <code>-an</code> in place of <code>-c:a libvorbis</code>.</p>

<p>Your Avanti GUI should look like this: </p>

<p><img src="https://i.stack.imgur.com/TcHUo.jpg" alt="enter image description here"></p>

<p>Change the crf number (30 in that pic) till you get the size you want.</p>
