I'm having a strange issue when trying to embed a YouTube-video via TinyMCE's embed media button.
When the embedded media is from YouTube, the size of the iframe is hardcoded to 425x350 and cannot be changed anywhere in the dialog. Other sources, e.g. Vimeo, work as expected.
Why is this? Am I missing a setting somewhere?
The EPiServer version of this site is 8.3, but I've tested it in a 7.19 site too with the same behavior.