Feeds allow search engines to easily learn about the contents on your website. The purpose is to help search engines include your content in the search index, which may not have otherwise been discovered by web content crawlers.
Submitting a video feed provides you with a higher assurance that your videos will be included in the index in a more complete and timely manner. "In addition, the feed can provide Bing with rich descriptions (i.e. metadata) about your videos that can be helpful for better understanding by users," posted Duane Forrester on Bing Webmaster Center blog.
"The Bing Media feed specification is an optimized media RSS (mRSS) feed for inclusion in the Bing Video index. It specifies three types of video feeds : full back-catalog feeds (aka "full feed"), incremental update feeds (aka "incremental feed"), and expire feeds," explained Forrester.
"All three have different purposes, but all share the same structure and format. The Bing mRSS video specification document covers optional and required tags, date/time format, and includes a complete example of a video feed."
Bing can also support other feed or sitemap protocols including:
Media RSS, which supplements the enclosure element capabilities of RSS 2.0 to allow for more robust media syndication by handling other media types, such as short films or TV, as well as provide additional metadata with the media. [Media RSS]
RSS 2.0 with media enclosures, is an older standard that specifies how to attach multimedia content to RSS 2.0 feeds by providing the URL of a file associated with syndicated entry. This has largely supplanted by media RSS feeds. [RSS 2.0]
Yahoo mRSS specification, similar to Bing's mRSS and could work on a basic level. However Bing mRSS specification adds several enhancements. [Yahoo mRSS]
Google Video Sitemap Protocol 0.9 as defined by sitemaps.org. [Google Video Sitemap]
Baidu Internet video open protocol, is an XML based markup format used by Baidu web partners to include video content into the Baidu search index. For further information refer to Baidu Webmaster.