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Black screen here, too (although the loading text went from 0 to 100%) on Firefox 44 on Windows 7.

I had the same problem on FF44 and Win7, but it worked fine on Chrome on Windows and OSX, worth firing up Chrome to check out, IMHO.

Sorry. If there’s one thing I’ve learned from this project, it’s that video support is hard.

I’m happy to take advice (preferably in the form of ffmpeg flags).

What were your ffmpeg flags to begin with?

It’s based on the example for 2-pass encoding, with tweaks for things like QuickTime support: https://gist.github.com/celoyd/90cc919105248a2ddc95

Worked fine for me on FF44 on Mac.