We're finding that video and audio recorded with RecordRTC to an activity is not playable in iOS. We've tested Safari, Chrome, and Firefox on iPhone and have reports of all browsers not working for iPhones and iPads. This behavior is the same on the desktop version of Safari, but I think that is already a known issue here.
When pressing play nothing happens. Sometimes on repeated clicking a small spinning icon shows up and goes away, but nothing ever plays. When playing back video, it does not even load the thumbnail correctly before or after pressing playing.
Unfortunately, I am not able to contribute code, but will try to help in any way I can. Thank you!