You can now check your Video Sitemap for even more errors right in Webmaster Tools! It’s a new Labs feature to signal issues in your Video Sitemap such as:
- URLs disallowed by robots.txt
- Thumbnail size errors (160x120px is ideal. Anything smaller than 90x50 will be rejected.)
To make it easier for everyone to understand video indexing and Video Sitemaps, we’ve created a video -- narrated by Nelson Lee, Video Search Product Manager
source: googlewebmastercentral.blogspot.com/
