Hi staud,
1a) Try to check the following:
– Choose the video template in the post in case you want to show it on the blog page too
– Choose the URL of the media file when selecting from the mediathek in the pop-up
1b) Try to check the following
– Choose the URL of the media file when selecting from the mediathek in the pop-up
2) On youtube click on “Share”, than on “Embed” and copy & paste THIS code into the HTML editor (not WYSIWYG) of WP. There you find width and height of the iframe who is hosting the embedded frame.
Cheers,
Alexander @ http://www.mouseclick.com