198284 2019-05-28 00:17:25 -0700 Web Audio fed into local <video> via MediaStreamAudioDestinationNode does not play on Mac 2020-05-29 11:12:08 -0700 1 1 1 Unclassified WebKit Web Audio Safari 12 Mac macOS 10.14 NEW InRadar P2 Normal --- 1 bvibber webkit-unassigned eric.carlson jer.noble tobor68 webkit-bug-importer oldest_to_newest 1539494 0 bvibber 2019-05-28 00:17:25 -0700 Web Audio such as an oscillator or script processor node piped into a local <video> through MediaStraemAudioDestinationNode doesn't play in Safari on Mac, but does work on iOS and the iOS Simulator. Tested Safari 12.1.1 and Technology Preview on macOS 10.14 and 10.13 (no audio), while it works on iOS 12.4.1 and the iOS 12.2 Simulator tested locally. Test case: https://jsfiddle.net/0uLg4j3w/ ---------- <div> <button id=start>Start</button> <div> <video id=sink playsinline controls width=320 height=240></video> </div> ---------- start.addEventListener('click', function() { start.disabled = true; var context = new (window.AudioContext || window.webkitAudioContext)(); var dest = context.createMediaStreamDestination(); var src = context.createOscillator(); src.connect(dest); src.start(); sink.srcObject = dest.stream; sink.play(); }); ---------- Expected results: tone plays Actual results: no tone plays 1540644 1 webkit-bug-importer 2019-05-30 22:19:57 -0700 <rdar://problem/51290997> 1657348 2 tobor68 2020-05-29 11:12:08 -0700 I've found this behaviour in iTunes 12.9.5 while playing local media as well as streaming iTunes extras, and webkit based browsers to bluetooth speakers.