youtube video formats not recognized
I'm receiving the error that the firefox 62 version that I have does not "recognize any of the video formats available" on youtube and I have also been having trouble with being unable to open other webm formats. I have as the other solutions asked refreshed firefox to it's factory state but that has still not solved the problem. I have checked the plugins page and it does show that the openh.264 plugin is there. Not sure why this could be happening. Ubuntu Linux 18.04
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You can test at say https://www.youtube.com/html5/ as all check marks should be blue.
If a couple are red then you may not have the appropriate FFmpeg package installed. This package among some other packages may not get installed in a new Linux distro install due to legal or copyright reasons. Ubuntu for example has a Ubuntu Restricted Extras for this.
Now that you say that, that does sound correct. but I'd be remiss to mark this solved as I cannot test it since that computer is encountering a hardware error at the moment.
And yes I had already been rerouted to that page and the two middle checks were not fulfilled.
For the middle checks -- H.264 -- ffmeg should help.