Version: CrOS veyron_minnie 8707.0.0 (Aug 14)
I also saw this on oak and nyan-big.

What steps will reproduce the problem?
(1) Go to apprtc.appspot.com/?debug=loopback&vsc=VP8.
(2) Press Join.

What is the expected output?
The call connects. The window shows the remote and local videos.

What do you see instead?
The window showed the local video only and the call did not connect. The log showed the error message below.

[1:15:0815/141736:ERROR:webrtc_video_capturer_adapter.cc(230)] NOTREACHED() hit.

void WebRtcVideoCapturerAdapter::OnFrameCaptured(
    const scoped_refptr<media::VideoFrame>& video_frame) {
  if (!(video_frame->IsMappable() &&
        (video_frame->format() == media::PIXEL_FORMAT_I420 ||
         video_frame->format() == media::PIXEL_FORMAT_YV12 ||
         video_frame->format() == media::PIXEL_FORMAT_YV12A))) {
    // Since connecting sources and sinks do not check the format, we need to
    // just ignore formats that we can not handle.
    NOTREACHED();
    return;
  }

https://cs.chromium.org/chromium/src/content/renderer/media/webrtc/webrtc_video_capturer_adapter.cc?q=webrtc_video_capturer_adapter.cc&sq=package:chromium&l=230


Other:
Hangout worked fine. Tomas. Can you help triage this? Thanks.