Video sitemaps are an excellent way to make sure that Google knows about all the video content on your site, especially content that we might not otherwise discover with our usual crawling mechanisms. Improving the findability of your video content can improve your site's appearance in Google Video Search results.
When you submit a sitemap that has video information to Google, Google makes the included video URLs searchable on Google Video. Search results contain a thumbnail image (provided by you or auto-generated by Google) of your video content, as well as the information (such as a title) contained in your sitemap. Note that we can't guarantee when or if your videos can be added to our index as Google relies on complex algorithms for this process.
You can create a separate sitemap listing your video content, or you can add information about your video content to an existing sitemap—whichever is more convenient for you. The Google video extension of the sitemap protocol enables you to give Google descriptive information—such as a video title, description, duration, etc.—that makes it easier for users to find a particular piece of content.
Note, it is possible that Google might instead use text available on your video's web page rather than the text you supply in your sitemap.
Add video information to a sitemap
You can create a sitemap based on the sitemap protocol, or you can use an existing mRSS feed as a sitemap, or both.
Your sitemap must include the following minimum information for each video: title, description, playpage URL, thumbnail URL and the raw video URL or URL to Flash video player. Without these five pieces of information, Google cannot surface your videos in our results.
Once you've created your sitemap, you can submit it using Search Console.Know the recognized file types
Google can crawl Flash SWF objects and the following raw video file types: .mpg, .mpeg, .mp4, .mov, .wmv, .asf, .avi, .ra, .ram, .rm, .flv. All files must be accessible via HTTP. Metafiles that require a download of the source via streaming protocols are not supported at this time.