Hi Jerry,
You'll need to build WebKit yourself with -DENABLE_MEDIA_SOURCE=ON. Be
aware that it is experimental and not supported. It might be buggy. We
have a developer working on it and are hoping that it will be in a
better state for WebKitGTK+ 2.20.
Sorry to bring bad news,
Michael
P.S. You might have better luck with 2.16 or 2.18 rather than 2.14.
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