This Omeka plugin adds the ability to import Youtube videos into Omeka as items while preserving as much metadata as possible
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The dimensions of the embedded youtube video display default to 640px by 360px. These dimensions can be set in the plugin configuration page, at /admin/plugins/config?name=YouTubeImport. Setting these values can fix display problems on some themes. Keep in mind that you should include units in your width and height entries (e.g. "640px" or "100%").