@jim: lol
but seriously, which part of the video was cut off?

If the missing part is at the end of the video, then it could've happened due to corruption. Depending on how that happened, the raw data could still be there.

If the missing part is in front; then that's rather baffling to me. Because a corruption at the start of the file (header area) afaik is quite fatal to media files and that would make them unplayable at all.