Deleted important video on my phone?

I have a cheaper Samsung phone. I had a video my fiance and I both loved. I deleted it :(

I tried several apps to try and retrieve it. But none seemed to work. However, I just found a file that has a recovered mp4!!

I extracted the video (480 mb). But I cannot play the video. This has to be it. I've had no other vids near that size :(

I have tried 8 different players. They all say they can't play it, or just close after looking at it.

Is it still lost