Video files on my K7 have always broken index
I frequently have this problem as well. My camera is the K-x. I have learned to ignore the warning. On Windows7 x64 professional the same video files play just fine with Windows Media Player. Sony Vegas Movie Studio 9 & 10 haven't complained about the video files either, so I've been assuming it is an issue with VLC.
|Morning At Picture Lake by Buzz Lightyear|
from Dawns first rays
|AT-6 Harvard by jarud|
from Trainer aircraft
|Matterhorn by ewng|