[mythtv-users] Not enough video to make thumbnail

[Mr. Myth]

My mythweb used to show thumbnails for for shows.

It broken a month or so ago when I was running fc3.

I recently upgraded to fc4 ( fresh install ) and am still having the 
problem.

The mythbackend.log contains the following errors.

2005-11-22 12:36:05.498 Not enough video to make thumbnail
2005-11-22 12:36:05.507 MainServer::HandleAnnounce FileTransfer
2005-11-22 12:36:05.515 adding: deathstar as a remote file transfer
2005-11-22 12:36:05.517 Could not open 
/mythtv/recordings/1012_20051121200000_20051121210000.nuv.png.  0 
retries remaining.
2005-11-22 12:36:06.103 Not enough video to make thumbnail
2005-11-22 12:36:06.111 MainServer::HandleAnnounce FileTransfer
2005-11-22 12:36:06.112 adding: deathstar as a remote file transfer
2005-11-22 12:36:06.113 Could not open 
/mythtv/recordings/1010_20051121183000_20051121190000.nuv.png.  0 
retries remaining.
2005-11-22 12:36:06.707 Not enough video to make thumbnail

on and on for each show when I look at mythweb.

The videos all play fine.  Does anyone know what might be causing this 
or how to fix it?

Michael