Created attachment 454520 [details] WebKit.GPU process logs I'm not able to resume an HLS stream in mobile Safari after backgrounding the app Issue is 100% reproducible on Simulator running iOS 13.4 RC. It also reproduces on my iPhone 12 running iOS 13.4 RC Issue occurred at 15:35:39 Steps to reproduce - Open https://codepen.io/dgoss/full/eYyOXJX in mobile Safari - Play 10 seconds of the HLS stream, pause - Background the app for 10 seconds - Open mobile Safari, tap Play WebKit logs that seem relevant App enters background, WebKit tells MediaPlayer to purge resources default 15:35:13.302978-0800 71785 com.apple.WebKit.GPU MediaPlayerPrivateAVFoundationObjC::setBufferingPolicy(4B3AC1364A25C7FC) PurgeResources default 15:35:13.303014-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfsi_performCurrentResourceConservationAction: [0x125d07280|P/MV] Setting resourceConservationLevelWhenPaused to 3 CoreMedia deletes some tracks default 15:35:13.306446-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_DeleteTrack: <0x126040a00|I/TKA.01> (0) track 3 default 15:35:13.306461-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_StopFeedingTrack: track 3 stopped feeding without setting EndTimer default 15:35:13.306510-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_DeleteTrack: <0x126040a00|I/TKA.01> (0) track 5 default 15:35:13.306575-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_StopFeedingTrack: track 5 stopped feeding without setting EndTimer More purging default 15:35:16.594082-0800 71785 com.apple.WebKit.GPU 0x104fe3430 - GPUProcess::prepareToSuspend(), isSuspensionImminent: 0 default 15:35:38.120907-0800 71785 com.apple.WebKit.GPU MediaPlayerPrivateAVFoundationObjC::setBufferingPolicy(4B3AC1364A25C7FC) MakeResourcesPurgeable App enters foreground and FigStreamPlayer is not ready to play, FigStreamPlayer never recovers default 15:35:39.340332-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_CheckIfLikelyToKeepUpAndNotify: tried to force playback but NOT ready for playback (0 buffered) default 15:35:39.340410-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_PostNotificationFromDispatch: posting Remote_RateWillChangeTo on 0x125d07280 (0x6000027d5340) default 15:35:39.340435-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_PostNotificationFromDispatch: posting RateDidChange on 0x125d07280 (0x6000027d5100) default 15:35:39.340451-0800 71785 com.apple.WebKit.GPU <<<< FigStreamPlayer >>>> fpfs_PostNotificationFromDispatch: posting PlaybackStateDidChange on 0x125d07280 (0x6000027d5020)