NEW 234723
MediaStream Recording API issue 
https://bugs.webkit.org/show_bug.cgi?id=234723
Summary MediaStream Recording API issue
Petr Bielak
Reported 2021-12-28 06:16:00 PST
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.
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Radar WebKit Bug Importer
Comment 1 2022-01-04 06:16:26 PST
<rdar://problem/87088095>
youenn fablet
Comment 2 2022-03-04 05:05:06 PST
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?
John
Comment 3 2022-10-20 11:35:11 PDT
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.
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