Corrupted Video repairing via hex editing

Its happened to me, camera shut off due to low battery and recording wasn't captured completely. I got a broken video, cant be played but I tried many of video repairing tools, stellar, wondershare, remo, grau etc. It got them fix upto an extent but the repaired video still has frame jumps and datamoshed segments. I tried only repairing solution which are very costly per video like 40$. So I decided learn this repairing on my own.
Can anyone suggest me a training or course or an institute on this advance data repairing of corrupted files? I tried hex editing and fixing headers but I am not good at it.
Thanks