Have you ever wondered how to convert simple movie files or audio files? I did this one time but I really figured this out. It is simple once you think you have seen it and you have hands-on with it. All you have to do is add an avi, mkv, mp4 and so on and if audio.file then just add a mp3, wmv, etc.
It's really simple. I have some of these files and once I did, I was like "It's really easy, I'm sure people want to know about it." Also if you are having trouble with converting the files I found that a video converter is a great tool but for some reason, if you are still having problems converting files lately, you can also use fast media converter but it takes some time to convert but do the job. You can also find free online video converter via https://convertfaster.com/VideoConversion
Stay away from conversion programs available online that are not trusted as they worked once, and after that just does not work anymore it would say error and I fiddled with it a lot. well, the results were the same. When it worked for me that one time it works wonders and was hella fast to convert files into mp4.
While on the other hand if you want to convert to MKV file then you can use actually a good software program if you want. Well, I hope this helps someone out in some way or another.