AVCaptureSession Stop Running about mtbbarcodescanner

[mikebuss]

I wasn't able to reproduce this on an iPhone 6 Plus running iOS 9. I turned the capture on and waited 20 minutes but didn't see any issues. Since this is not something specific to MTBBarcodeScanner, and sounds more like an AVFoundation issue, I think your best bet is to use StackOverflow or file a bug report to Apple.

[zackfletch00]

+1, I'm having the same issue on my iPhone 6S Plus running iOS 9.3. On a seemingly random basis, sometimes as frequently as every 15-20 seconds, my session is interrupted or stopped (sometimes i get WasInterrupted notification, other times I get DidStopRunning notification). The torch also cuts off during these times. My best workaround was to observe for those notifications and call startRunning on the session and relight the torch manually each time that an interruption occurs.

This might occur more often while playing music in the background, because I have noticed few interruptions at one point while not playing music. But in further tests I can't prove a correlation – the rate of capture session stoppage is about the same even after playback is stopped. Average rate over an hour is about 75 interruptions / hour, with interruptions lasting 6-7 seconds in length (scanner unusable about 15% of the time). Interruption rate does vary, but doesn't get measurably better or worse over time as the app runs. I'll continue testing, troubleshooting, and trying solutions and post any good solutions that I find.

[zackfletch00]

Amazingly, the interruptions seem to be related to Headphones being plugged in! Unplug headphones, and no interruptions. Plug them back in, and the session is once again stopping itself. Problem solved?

[zscgeek]

Were you ever able to track down a fix to this other then removing the headphones?

[DJM0]

Would love to know this as well. I had to write some hacky code to detect whether the session has crashed and restart it.

[mikebuss]

I haven't had much luck reproducing this on my end with an iPhone 6S Plus running iOS 9.3.2. Is anyone able to reproduce this reliably with a set of steps?

I created a bare-bones implementation using AVFoundation in a separate Xcode project we can use. Hopefully this will help narrow it down a bit. If you're able to reproduce the issue in this project, please let me know, and I can investigate further (and move any fixes into MTBBarcodeScanner):
https://www.dropbox.com/s/us8eoz5bxtjxacy/SampleBarcodeProject.zip?dl=0

If this turns out to be an issue with AVFoundation, we can submit this project (and steps to reproduce) as a radar to Apple.

[hardikdevios]

This is more likely an issue from Apple side because the session is getting stop without no reason, i have write code with my own and same thing is happening. And yes session is getting frequent interruption while you plugin the headphones or playing music in background even if you have started camera and put it in background that also be case.