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How to connect Firefox to Chrome to transfer h264 via WebRTC?

I am trying to connect Firefox 45 to Chrome 51dev to transfer h264 video. Firefox for Firefox and Chrome for Chrome works fine. But Firefox for Chrome transmits vp8 video, although I set h264 priority.

To set the priority of the codec, I used this link: https://miguelpdl.imtqy.com/WebRTC-codelab/session06/lab/html/step03.html

In response to the deleted description, it contains:

m=video 53100 UDP/TLS/RTP/SAVPF 107 100 101 116 117 96 97 99 98
...
a=rtpmap:107 H264/90000
a=rtpmap:100 VP8/90000
a=rtpmap:101 VP9/90000
a=rtpmap:116 red/90000
a=rtpmap:117 ulpfec/90000
a=rtpmap:96 rtx/90000
a=rtpmap:97 rtx/90000
a=rtpmap:99 rtx/90000
a=rtpmap:98 rtx/90000

But the local description contains only:

m=video 9 UDP/TLS/RTP/SAVPF 100
...
a=rtpmap:100 VP8/90000

Can I connect Firefox to Chrome to migrate h264?

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Chrome H.264. . , VP8.

/ , :

, Firefox H.264:

a=rtpmap:126 H264/90000
a=rtpmap:97 H264/90000

Chrome VP8, , :

a=rtpmap:100 VP8/90000

, , Chrome Chrome, , VP8.

H.264.

:. -, H.264 Chrome 50. :

chrome://flags/#enable-webrtc-h264-with-openh264-ffmpeg
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