iphone - AVAssetWriter fails once App goes in background -


i working on ios app in creating video images. using avassetwriter achieve this. works fine. when app goes in background , switched back, video writing fails. avassetwriter's finishwritingwithcompletionhandler not getting called when switch app.

may duplicate of avassetwriter fails when application enters background during rendering , not getting there.

any idea this?

thanks

this answer based on assumption want video continue rendering while in background.

i fixed in app doing asking os grant app background task permisions (for limited amount of time). answer might ios generating video in background task

    @property (nonatomic,assign) uibackgroundtaskidentifier __block backgroundrenderingid;      uiapplication *app = [uiapplication sharedapplication];      _backgroundrenderingid = [app beginbackgroundtaskwithexpirationhandler:^{         [app endbackgroundtask:_backgroundrenderingid];         _backgroundrenderingid = uibackgroundtaskinvalid;     }];

don't forget let go once done!

[[uiapplication sharedapplication] endbackgroundtask:_backgroundrenderingid];

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