Hello @HOU O YOUNG
Where is the source WebRTC stream coming from in to this play example?
Please test with the Publish example we have here: https://www.wowza.com/_private/webrtc/
Then test that stream in the play example.
If the source stream is coming from Wowza Streaming Engine, first I would suggest trying the following change:
In Application.xml -> RTP container -> rtpUseLowestH264Constraint -> set to “true”
Save the .xml file and restart the application in question.
If that does not help then change in Application.xml -> RTP container -> rtpForceH264ConstraintValue -> 128 or 224 or 240.
Again, save the .xml and restart the application and do further testing.
As far as using baseline and main. I believe the encoder should be using baseline by default.