VideoResponse.Total Property (Bing, Version 2.1)
Returns a number that represents an estimate of the total number of results returned by a VideoRequest.
Based on a number of technical reasons, which are beyond the scope of this documentation, the Bing Engine does not return an exact total for a VideoRequest.
The Bing Web Service is designed to handle this approximation when paging through results. If the number of results remaining, in the actual total set of results from the specified offset, is equal to or greater than the number of results requested in the VideoRequest.Count field, the requested number of results is returned.
If the number of results remaining is less than the number requested, the Bing Engine returns the remaining results without error.