css - The element has no supported sources.???

Question

The video address seems not to be added. Sometimes it can be played normally, but sometimes this problem occurs. Has anyone encountered the same problem? ? ? ?

Answer 1

I am troubled by this problem now. I double-checked the path and it is completely correct. And after manually changing the path src, it became normal again. If the author has an answer, please remember to share it

Answer 2

Same question. I guarantee that the video address is correct. It's normal to change the video.