I converted a video to webm through Any Video Converter and it plays fine in Firefox. However, in Chrome it constantly resizes itself during playback and I'm not sure why.
I previously used Miro converter, but that video wouldn't play in Firefox at all for some reason. It would jump instantly to the end of the video when I pressed play. When using my custom settings, it did the weird resizing thing in Chrome, but when I exported it again using the default settings, it played normally in Chrome, but still nothing in Firefox, so I switched to using Any Video Converter and now the resizing issue is back. I didn't change anything in the settings.
Here's the link: http://kimkellermedia.com/videoTest.html
I'm using the latest versions of both Firefox and Chrome by the way.