Have you Googled or even tried tools like " Video Repairer" yet?
I understand your frustration, I have some video of an ex which was captured 10+ years ago on a camcorder and then imported onto the PC using Hauppauge capture card using a strange codec. This meant I could not play it on recent pc's or macs
I ran the video though some expensive transcoding software and it fixed the problem for me.
What ever you do - keep a backup on an external device, in case you corrupt the original any further.
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