Comment 5 for bug 1631763

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madbiologist (me-again) wrote :

From the Firefox 54 for developers page:

Encrypted MediaExtensions API

* Support has been added for the VP9 codec in encrypted streams using Clear Key and Widevine (bug 1338064).
* Previously, MSE was only allowed to use WebM/VP8 video if the system was considered "fast enough." Now playback of VP8-encoded webm/video media is always supported, regardless of system performance.

These features could still be removed at the last minute before Firefox 54 is released on the 13th June 2017.