Bug 237799

Summary: Unable to resume HLS stream in Safari after backgrounding the app
Product: WebKit Reporter: Davis Gossage <davis>
Component: MediaAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Major CC: adam, davis, jer.noble, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari 15   
Hardware: iPhone / iPad   
OS: iOS 15   
Attachments:
Description Flags
WebKit.GPU process logs
none
simulator sysdiagnose
none
video of issue none

Davis Gossage
Reported 2022-03-11 15:51:46 PST
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)
Attachments
WebKit.GPU process logs (144.02 KB, text/plain)
2022-03-11 15:51 PST, Davis Gossage 		no flags
Details
simulator sysdiagnose (deleted)
2022-03-11 15:53 PST, Davis Gossage 		no flags
Details
video of issue (10.04 MB, video/mp4)
2022-03-11 15:54 PST, Davis Gossage 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Davis Gossage
Comment 1 2022-03-11 15:53:18 PST
Created attachment 454521 [details] simulator sysdiagnose
Davis Gossage
Comment 2 2022-03-11 15:54:45 PST
Created attachment 454522 [details] video of issue
Davis Gossage
Comment 3 2022-03-11 15:57:04 PST
Also filed feedback https://feedbackassistant.apple.com/feedback/9954511
Alexey Proskuryakov
Comment 4 2022-03-11 16:40:01 PST
rdar://90184838
Alexey Proskuryakov
Comment 5 2022-03-11 16:42:01 PST
The content of attachment 454521 [details] has been deleted for the following reason: Let's not keep the sysdiagnose here, it's sufficient to have internally at Apple.
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