How to combine audio rtsp stream and video rtsp stream?

[Gpwner]

Is your feature request related to a problem? Please describe. I have a video rtsp stream and a audio stream,I wonder how to comine them in js. e.g. video:rtsp://10.44.200.69/live/video audio:rtsp://10.44.200.69/live/audio Describe the solution you'd like Just want to display the audio and related video and the same time in Front-end