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Google supports and recommends using the schema.org on-page markup for videos. However it is not clear if this should also be done when embeddeding a YouTube video. Or really even a Vimeo video. Or is the schema.org only necessary when hosting the videos yourself?

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Do you ask if Google might show a Rich Snippet for externally hosted videos, or do you want to know if it’s allowed according to Schema.org? – unor Feb 26 '14 at 1:01
Is the Google embed <iframe> already setup for Bing/Google to get the data from or do I need to add Schema around it? – Ryan Feb 26 '14 at 1:39

schema.org is never necessary and you are free to markup (or not) whatever you wish, including third-party content. It's up to you if you wish to add markup or not — there's nothing saying you shouldn't. Feel free to use sameAs to refer back to the original youtube.com/etc page.

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