UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Steps to reproduce the problem:
1. In WIN 10 open the test demo  https://test.rtc.qq.com:8080/?type=sameaccount&roomid=1900011   in two computer, and one join first, the other join after. 
2. you will found the first frame decode failed, because browser use hw decode default.

What is the expected behavior?
immediately see the picture

What went wrong?
Our product use webrtc to received the video/audio(h264/opus), the video gop is 10s.  
our user mostly use chrome 55, we found that  the first key frame hw decode fail, users need to wait next key fream (10s) and when then browser automatically change to sw decode so that they can see the picture.
users are very hard to close hw decode by chrome://flags/#disable-accelerated-video-decode.
is that any ways to use sw decode default in webrtc, or can we do something in anchor encode to pervent this problems.

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 55.0.2883.87  Channel: stable
OS Version: win10
Flash Version:
 

Deleted: gpu_2.html 153 KB

gpu_2.html 153 KB View Download

Deleted: 首帧慢_360chrome_debug.log 753 KB

首帧慢_360chrome_debug.log 753 KB View Download