Chrome Version: 57.0.2950.0 (Official Build) canary (64-bit)
                Revision	2c3ecceea409b42c873949bac0aa1acaa80451e3-refs/heads/master@{#438011}
OS: Mac 10.11/6

What steps will reproduce the problem?
(1) Start an AppRTC loopback call with H264 params appended - https://appr.tc/?debug=loopback&vsc=h264
(2) Once the local video is seen, press "i" to get the info overlay stats in the apprtc call.
    - Notice that both Video Tx and Video Rx is H264 

What is the expected result?
The remote video should be seen as well

What happens instead?
Local video is seen, but remote video is missing

Please use labels and text to provide additional information.
1. This issue does not happen in VP9/VP8 calls
2. This issue is not seen in M56 Beta 56.0.2924.23
3. This issue is not seen in Win, Linux in M57 
4. chrome://webrtc-internals does not show the call getting successfully established; i.e., I see only one tab for the call
5. Attached screenshot 
 

Deleted: Screen Shot 2016-12-13 at 10.56.23 AM.png 759 KB

	Screen Shot 2016-12-13 at 10.56.23 AM.png 759 KB View Download