[Q] mobile hidden camera video not playing.

[hardstring]

I made a few videos using the app "mobile hidden camera" on my motorola Atrix 4G. Almost all of the videos work fine except for 2 which when played give the error "cannot play video". I have tried playing using it MX player but still no success. The video were encoded in h.264. Can anyone tell me how to play these videos? or why arent these video playable?