Posted 19 July 2018 - 06:43 PM
What are you using to do the conversions, you might have found a bug in that software. Personally I've used handbrake https://handbrake.fr/
for video format conversion, if handbrake isn't what you're using already you might see if it handles the conversions any better, just pick a preset quality option and convert, no need to fiddle in the detailed settings panels.
Back on this site, for a while anyway, been so busy the last year.
My systems:2 laptops, intel i3 processors, windows 8.1 installed on the hard-drive and linux mint 17.3 MATE installed to USB