Unsupported format, damaged file, incompatible file encoding format, unstable network and insufficient performance of hardware equipment.

Cool movies can't be played for several reasons:

1. Video file format is not supported. Some video files can only be played if a specific player is supported. If you don't have the right player, you can't play.

2. The video file is damaged and cannot be played.

3. The encoding format of the video file may be incompatible, which may also lead to the inability to play.

4. The network where the video file is located is unstable, which makes it impossible to play.

5, hardware equipment performance is insufficient, the operating system is incompatible, and so on.