Some youtube videos recently became unplayable, page only partially loads.
Somewhere during last week or two, some youtube videos stopped being playable, with "Your browser does not currently recognise any of the video formats available" error message replacing video. Those videos used to play normally before, now they don't.
What's interesting, is that in addition entire page loads only partially, here's a screenshot: https://screenshots.firefoxusercontent.com/images/ba687b41-454c-4293-94e4-921bb863e54c.png Here's link to video on which screenshot was made: https://www.youtube.com/watch?v=bjBmT8y9PAU
It's part of the series, both preceding and succeeding videos work fine.
Problem happens on 2 separate machines, one with Windows 7 (64 bit system, 64 bit FF), other one with Windows 10 (64 bit system, don't have access to this machine now).
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Do you have any extensions for YouTube that deal with the HTML5 media player or try to force a Flash player?
Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
- do NOT click the "Refresh Firefox" button on the Safe Mode start window
- https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
- https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems
You can try these steps in case of issues with web pages:
You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
- hold down the Shift key and left-click the Reload button
- press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
- press "Command + Shift + R" (Mac)
Clear the cache and remove the cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).
"Clear the cache:
- Options/Preferences -> Privacy & Security -> Cached Web Content: "Clear Now"
"Remove the cookies" from websites that cause problems.
- Options/Preferences -> Privacy & Security -> "Use custom settings for history" -> Cookies: "Show Cookies"
I tried everything you suggested even before posting the problem. Those actions were suggested in every thread I found, and didn't work on either machine.
I hadn't checked the YouTube page, but trying it I get the same error. This file seems to be available as 3gp file and Firefox can't play this file.
You will have to download this file and use an external media player. The only player that worked for me on Linux (video and audio) is MPlayer.