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Known problems: - iOS or macOS Safari: Call the 'MediaStream' object obtained by 'MediaDevices.getUserMedia({audio:true})', 'MediaStream' first use is no problem, but if 'MediaStream' second use will be a problem. If you call 'MediaDevices.getUserMedia({audio:true})' again to get 'MediaStream', there will be no problem. - iOS: if any audio has been played before calling 'MediaDevices.getUserMedia({audio:true})', recording will not be possible at all. If the getUserMedia is called first and then the audio is played, there is no problem. - win10/android chrome and firefox don't have any of the above problems.These problems can be reproduced according to the test flow on the page : https://xiangyuecn.github.io/Recorder/assets/ztest_apple_developer_forums_getusermedia.htmlMy test environment: iOS: iPhone 5s 12.3.1 macOS: 10.14.5 win10: chrome and firefox android: chrome and firefox