I Use PlainTransport to push H264 main profile video file, web browser playback freezes

Integration
1 
			{
				kind       : 'video',
				mimeType   : 'video/h264',
				clockRate  : 90000,
				parameters :
				{
					'packetization-mode'      : 1,
					'profile-level-id'        : '4d001f',
					'level-asymmetry-allowed' : 1,
					'x-google-start-bitrate'  : 1000
				}
			},

Video file parameters：
ffmpeg -i tiktok.mp4 -pix_fmt yuv420p -c:v libx264 -r 30 -profile:v main -level 4.1 -b:v 1000k -acodec aac -ab 128k -ac 2 -ar 48000 -f flv tiktok.flv

I Use PlainTransport to push H264 main profile video file, But web browser playback freezes，why?
baseline profile video file can be played normally。

2

Main profile is not supported by all browsers, only constrained baseline profile is guaranteed to work in all browsers supporting H264.

3

The latest chrome seems not support H264 for WebRTC anymore.