Problem with my camera recording

A

AC Question

I filmed a very important video to me with the camera of my galaxy s4 active, 7 minutes video.
I filmed a video to my SD card, When i've pressed to stop recording it got stucked, for a long long time and i didn't knew that to do and in the end black screen and it crashed.
A file called temp_video appeared and it started to gain size so i let him work... after 65 mb it stopped and when i've tried to recover it, it only showed a few seconds... is there a way i can recover the full video? please it is really important.