Failed to decode media resource. Why is there an error?

Question

HTML

Hello! Video not playing, what could be wrong?
In the logs is:

Failed to decode media resource https://v001.radikal.ru/1612/da/6144468598-5-7d137...
Failed to load any resource candidate. Media download is paused.
Well, etc.

Link codepen.io/anon/pen/ggYmop

Answer 1

In the browser, you can reset the cache or you have downloads disabled in it altogether, this is how media works