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Changes 2015.10.18:
* get format_id from video file ext
* check for the offline error page
* treat the offline error as an expected ExtractorError
* Look for sm4:video:embed
* Add _extract_url
* Use _extract_url for mtvservices
* get format_id from video file ext
* check for the offline error page
* treat the offline error as an expected ExtractorError
* Look for sm4:video:embed
* Add _extract_url
* Use _extract_url for mtvservices