VLCMobileKit iOS crash on screen lock on iPhone 4 - ios

Question

I am facing a strange issue in MobileVLCKit for iOS.I am playing RTSP links in my app. I have set the flag to play audio and video in background to true in my app. So when the app goes in background the video playing in my VLC player keeps playing without any problem.
But on iPhone 4 (with iOS 7.0.4) when I lock the screen of my iPhone when the video is playing, the app crashes without showing any logs. Strange thing is that if I send the app in background by pressing home button then the app doesn't crash. The issue is only on iPhone 4 and not on iPhone 5.
Have somebody come across such issue before?
Bellow is device crash log:
May 27 03:18:41 My-iPhone-VI kernel[0] <Debug>: 019323.846533 wlan.A[400] AppleBCMWLANNetManager::updateLinkQualityMetrics(): Report LQM to User Land 100, fAverageRSSI -69
May 27 03:18:41 My-iPhone-VI kernel[0] <Debug>: ALS: AppleARMBacklight::setBacklightEnableGated 0 (set level to 0x1c8)
May 27 03:18:41 My-iPhone-VI kernel[0] <Debug>: AppleMultitouchN1SPI: updating power statistics
May 27 03:18:41 My-iPhone-VI kernel[0] <Debug>: ALS: AppleARMBacklight::handleMessageGated - framebufferState -> 0
May 27 03:18:41 My-iPhone-VI backboardd[28] <Notice>: Posting 'com.apple.iokit.hid.displayStatus' notifyState=0
May 27 03:18:41 My-iPhone-VI SpringBoard[34] <Warning>: [MPUNowPlayingController] Not registered for now playing notifications. Ignoring call to -unregisterForNotifications.
May 27 03:18:41 My-iPhone-VI backboardd[28] <Notice>: MultitouchHID: detection mode: 0->255
May 27 03:18:41 My-iPhone-VI MyApp[817] <Warning>: log: applicationWillResignActive
May 27 03:18:41 My-iPhone-VI MyApp[817] <Warning>: log: applicationDidEnterBackground
May 27 03:18:42 My-iPhone-VI profiled[818] <Notice>: (Note ) profiled: Service starting...
May 27 03:18:42 My-iPhone-VI ReportCrash[819] <Notice>: ReportCrash acting against PID 817
May 27 03:18:43 My-iPhone-VI ReportCrash[819] <Notice>: Formulating crash report for process MyApp[817]
May 27 03:18:43 My-iPhone-VI com.apple.launchd[1] (UIKitApplication:com.My.MyApp[0x19d8][817]) <Warning>: (UIKitApplication:com.My.MyApp[0x19d8]) Job appears to have crashed: Segmentation fault: 11
May 27 03:18:43 My-iPhone-VI backboardd[28] <Warning>: Application 'UIKitApplication:com.My.MyApp[0x19d8]' exited abnormally with signal 11: Segmentation fault: 11
May 27 03:18:43 My-iPhone-VI mediaserverd[46] <Warning>: Encountered an XPC error while communicating with backboardd: <error: 0x3cd9f744> { count = 1, contents =
"XPCErrorDescription" => <string: 0x3cd9f9dc> { length = 22, contents = "Connection interrupted" }
}
May 27 03:18:43 My-iPhone-VI ReportCrash[819] <Notice>: Saved crashreport to /var/mobile/Library/Logs/CrashReporter/MyApp_2014-05-27-031842_My-iPhone-VI.plist using uid: 0 gid: 0, synthetic_euid: 501 egid: 0
May 27 03:18:53 My-iPhone-VI profiled[818] <Notice>: (Note ) profiled: Service stopping.
Below is the stack trace taken in method didEnterBackground:
Stack trace : (
0 MyApp 0x0010a191 -[MyAppAppDelegate applicationDidEnterBackground:] + 76
1 UIKit 0x2fc85543 <redacted> + 590
2 UIKit 0x2fc06ae1 <redacted> + 764
3 UIKit 0x2fc06721 <redacted> + 72
4 UIKit 0x2fc6bb3d <redacted> + 664
5 GraphicsServices 0x320a270d <redacted> + 608
6 GraphicsServices 0x320a22f7 <redacted> + 34
7 CoreFoundation 0x2d4599df <redacted> + 34
8 CoreFoundation 0x2d45997b <redacted> + 346
9 CoreFoundation 0x2d45814f <redacted> + 1398
10 CoreFoundation 0x2d3c2c27 CFRunLoopRunSpecific + 522
11 CoreFoundation 0x2d3c2a0b CFRunLoopRunInMode + 106
12 GraphicsServices 0x320a1283 GSEventRunModal + 138
13 UIKit 0x2fc66049 UIApplicationMain + 1136
14 MyApp 0x001078e9 main + 116
15 libdyld.dylib 0x37d26ab7 <redacted> + 2
)

Answer 1

You need to disable video decoding prior to entering the background state. Otherwise, MobileVLCKit will try to draw OpenGL contents in the background which will be prevented by the OS by terminating the app.
You can disable video decoding by setting the current video track on your media player instance to -1. Once your app is moved to the foreground again, switch it back to the currently decoded video track (so you should cache it if your stream includes more than one video track).
When disabling video decoding, audio decoding is not affected and will continue just fine. This approach also got the benefit of saving CPU load and battery.. ;)
This is how VLC for iOS works, too. :)

Answer 2

i think You need to disable video decoding prior to entering the background state,this will work for sure this is major thing Apple says that a fix for the home screen crashes is coming also you can read here more How to take a screenshot on iphone without using lock button