They could be in a format not supported by your PC. Some videos won't play on your new MacBook Air, and you're wondering how to fix this problem since you can't ditch those videos altogether. What to Do If Your Computer Won't Play Videos
Codec issue: the needed codec is not installed on your computer.Freezing: the video file is corrupted because there was an interruption while it was being downloaded.Playback error: your player doesn’t support the type of file you’re trying to open because it doesn’t include the codec used to compress it.
