Mediainfo is just a tool providing with data and stats regarding the file, and nothing about its contents at all provided the name of the file doesn't give too much information of course
It gives the codecs used, formats and all kinds of information that is precious to help someone with their file.

mpc-hc can sometimes help if the video card is compatible with DXVA and you're lucky with the file.


regarding the glitch, it probably is coming from the time it was recorded as you pointed out, so there's probably nothing to do about it. VirtualDubMod can repair the index of files, so if it didn"t do it, the problem is elsewhere. There are some repair tools, but its more like hit and miss... and sometimes be very lucky.
Best choice would be to cut the part, probably