Video [Q] sgs3 video recording error, need help to play video

I was recording a video, I got an error message 'recording failed' my screen was frozen then went to the home page. I checked my videos and the video I was recording when I got the error was saved there. Its a white screen, details say its 1 gb, but I cannot play it, keeps saying cannot play video. Is there anything I can do to play this video or retrieve it, I hope there's something I can do.
Thank you so much!
MeeshaLin