Video content and audio content can be indexed and made SEO friendly which can improve the search visibility on varied search options of the search engines.
One of the ways is to add the video and audio content using microdata as per the schema.org.
Usually when we add video we embed the code generated via YouTube for that video if it is on YouTube or for that matter any other video broadcasting site like vimeo, Ted, etc.
For example:
<iframe width="”560″" height="”315″" src="”http://www.youtube.com/embed/7xxxxxxxxxxxxxxx?list=UU0LI2nnnSO6lP8ZFj9FIdyA&hl=en_US”" frameborder="”0″" allowfullscreen=""></iframe>
But using the microdata format as per schema.org the same code can be written as :
Video: SEO xxxxxxxxxx
<iframe src="”http://www.youtube.com/embed/xxxxxxxxxxxxk”" frameborder="”0″" width="”640″" height="”390″"></iframe>
Description, keywords and markup here .
More information here: http://schema.org/VideoObject