When reporting a media issue happening on MacOS, on top of describing what is happening and where, we need more information to be able to follow up with it.
Please visit the following site, copy paste its content and share it with us:

  • GPU: vivaldi://gpu

And could you visit the following links and tell us which option is selected for the selected flags:

  • vivaldi://flags/#ignore-gpu-blacklist
  • vivaldi://flags/#disable-accelerated-video-decode

Please copy paste all this information on vivaldi.com/bugreport