If it's not a network problem, you can try to find other websites. For example, there are many videos of large-scale open online courses forwarded by the company, and the products of the same type are highly replaceable, so you can try them elsewhere.
As we all know, there are many video formats, such as AVI format, NAVI format, ASF format, MOV format, WMV format, FLV/F4V format, H.264, H.265 and so on. In fact, they are all interchangeable.
However, in daily life and work, many people give up watching videos because the format can't be played, or look for other playback sources again. In fact, the method is very simple, that is, using a fast video converter to convert videos of different formats into required formats.
Other reasons why the video cannot be played:
1, decoding problem, just decode the packet in Dortmund or Huajun. (You can try playing video files in other formats. )
I don't answer the question of file damage. (Try playing another video file)
3, the player installation problem, just remove and reinstall.