Dovrai installare un gestore di script utente per installare questo script.
Intercepts isTypeSupported() calls by YouTube and lies about HDR support being available.
If this has no effect on yours, please edit the code of the script by removing the // on this line:
//console.log('testing for: '+ type);
Then, when you load a video, the script will dump out a list of all the different codecs YouTube is checking for to the Web Console.
I think the interesting ones will contain
eotf so you can filter the Web Console on that as a first approximation.