234723 2021-12-28 06:16:00 -0800 MediaStream Recording API issue 2022-10-20 11:35:11 -0700 1 1 1 Unclassified WebKit WebRTC Safari 15 iPhone / iPad iOS 15 NEW InRadar P2 Major --- 1 peter webkit-unassigned support webkit-bug-importer youennf oldest_to_newest 1827073 0 peter 2021-12-28 06:16:00 -0800 Event "ondataavailable" returns empty Blob when more than ~1-2 minute video is recorded (no timeslice specified). This issue is more likely to occur if a lot of apps are currently opened on the device. The issue is actual since iOS 15. Everything worked perfectly on iOS 14.8. It renders MediaStream Recording API unusable. 1827922 1 webkit-bug-importer 2022-01-04 06:16:26 -0800 <rdar://problem/87088095> 1848260 2 youennf 2022-03-04 05:05:06 -0800 An empty blob may happen in case there is no submitted video frames for instance. @Petr, do you have a repro case? Or can you send me a sysdiagnose (youenn@apple.com) on a recent iOS version? 1907114 3 support 2022-10-20 11:35:11 -0700 I also get this issue with our iris.fm service. The crazy thing is sometimes the empty blob is okay. Sometimes it breaks the recording. I also get issues where its not called regularly. I set the interval to 10 seconds and ondataavailable isn't called. Causes all kinds og issues.