It seems not to be a problem with your programme.
If the video plays correctly on some computers
and does not play correctly on other computers
then it is a problem of missing codecs.
Can you play your video with other video players?
You must find out what codec you need in order to play your video.
Maybe you could also try Codec Guide: K-Lite Codec Pack - For Windows 10 / 8.1 / 7 / Vista
] in order to install the missing codecs.