Sory this simple question, but don't find how to to it.
How to set different video sizes?
As I remember, on previous version of emfield its possible define video sizes.
I know you posed this question in 2011 but I felt like answering. The video size can be set in the CCK field of the content type where users can create a media link. There are only 2 sizes you can set Video Display Settings and Video Preview Settings. Hope this helps.
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