The media could not be loaded, either because the server or network failed or because the format is not supported.

[Caxhanguita]

Cómo solucionar errores de video, almacenamiento en búfer y bloqueo

[DoctorG]

@Caxhanguita Welcome in our Vivaldi Community

Enjoy browsing with Vivaldi.

Some useful links for you:

• Vivaldi Features
• How To
• Vivaldi Tips
• Tutorials
• Vivaldi Help
• Using the Forum Search
• Local Forums in your language
• Troubleshooting issues
• Common Security-Related Questions
• Help on Feature Requests
• Modding Vivaldi
• Snapshot vs Stable browser
• Vivaldi's Business Model
• Help us grow

[DoctorG]

@Caxhanguita Please in english.

Post a screenshot of such error message here.
And information about Vivaldi version, Linux version and Desktop version.
Can you describe in a few steps how to reproduce your issue?

Any error messages after stating Vivaldi in shell with command
vivaldi&

Try to run this command in shell to get latest media codec libs:
sudo /opt/vivaldi/update-ffmpeg
and run Vivaldi:
vivaldi&