Created attachment 8544207 [details] youtube.txt Seen while running: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:37.0) Gecko/20100101 Firefox/37.0 ID:20141231030205 CSet: 88037f94b7d7 STR: 1. Begin playing https://www.youtube.com/watch?v=vdwk9bcsxlM Expected: Would get DASH Actual: "The Adobe Flash Player is required for Video Playback" bholley did some troubleshooting and there is a document which contains the source attached. Adding Jet since I was told he was the contact here.
I debugged this for a bit, but the minified source (and broken-ish JS debugger on Nightly) made it really painful. The error code we're getting is html5.unsupportedads. I'm guessing that there's some sniffing going wrong on YouTube's end. We need their help here.
(Note that the thing telling us to install flash is html5player.js).
Summary: Youtube not able to serve up correct content - Getting Flash Player error message in Content Pane → Youtube sometimes wants flash even with MSE enabled
Per YouTube, certain partner ads are still in Flash format and are still getting migrated over to HTML5. I'm told the number of such ads is "very small."
Closing because this is on YouTube.
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → INVALID
You need to log in before you can comment on or make changes to this bug.