When MC builds thumbnails for recorded tv and indeed all supported video types with no pre-defined coverart, it uses a frame from the first few seconds into the file. It would be much better if it could use a frame from say the 10 minute mark instead. This would increase the chance of getting a more meaningful image of the actual program or video rather than an advertisment (in the case of recorded tv) or 100's of identicle 20th Century Fox logos - for all those avi movies ;-)
Thanks.