The reasons could be that your video file is damaged, corrupted, bad sectors on a hard drive, some electromagnetic interference, virus attack, or other software problems. Here are some errors that you can experience while playing the video file.
Why some video files Cannot be opened?
Common Reasons for Video Playback Errors Your media player cannot play it. Codecs are missing from your computer. The file extension is unrecognized. A DRM decryption key is missing.
Why some videos are not playing?
Your video is corrupt. The media player is outdated. Android OS is not updated. The video is not downloaded completely from the source.