197550 2019-05-02 21:22:23 -0700 calling getVideoPlaybackQuality() during seek will cause hang instantly until end of downloads media source 2019-05-03 10:17:48 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 root webkit-unassigned eric.carlson webkit-bug-importer youennf oldest_to_newest 1532644 0 root 2019-05-02 21:22:23 -0700 calling getVideoPlaybackQuality() during seek will cause hang instantly until end of downloads media source. This also happened when Web Inspector is opened. * Reproducing step 1. play any mp4 video with url that is never cached yet 2. registering `seeking` event listener which contains getVideoPlaybackQuality() 3. move playhead to unbuffered timeline on video timeline shown 4. repeat 3 until hang it browser (optionally) If you cannot reproduce with above steps, maybe using `timeupdate` handler will helpful to reproduce (see to code stubs in below) * Reproducing environments iOS Safari / WKWebView (iOS 12.1, iOS 12.2, iOS 12.3 public beta3) macOS Safari 12.1.2, Safari Technical Preview 81 (macOS 10.14.4) MiniBrowser.app (r244898, macOS 10.14.4) * Test stubs <!-- you need to change video source, and it should be MP4 Also, It is not matter of video container. --> <video src="http://example/v.mp4" controls id="x"></video> <div id="logger"></div> <script> var x = document.getElementById('x'); var l = document.getElementById('logger'); function log( l.innerHTML = object.totalVideoFrames; } x.addEventListener('seeking', function () { log(x.getVideoPlaybackQuality()); }); // It happened more frequently happened with following stubs // x.addEventListener('timeupdate', function () { // log(x.getVideoPlaybackQuality()); // }); </script> 1532828 1 webkit-bug-importer 2019-05-03 10:17:48 -0700 <rdar://problem/50447868>