A response from someone here at Apple: > Hello Steven, > I'm Brad Ford, from the AVFoundation capture team. We generally do not read > this list. If you believe there's a bug in AVCaptureConnection, please file > a bug at bugreport.apple.com <http://bugreport.apple.com/> with sample code > that reproduces the problem. FYI, the best place to get feedback from real > engineers on AVFoundation APIs is devforums.apple.com > <http://devforums.apple.com/>. Find the appropriate forum and post there. > Many engineers monitor those forums. > > Thanks! > -B.
Greg > On Nov 11, 2014, at 7:28 AM, Steven Clark <[email protected]> wrote: > > I tried about a gazillion different things and found exactly one change that > makes the problem go away. > > In the midst of setting up the AVCaptureSession, there was a property > assignment to set the frame rate (assign to > AVCaptureConnection.videoMinFrameDuration) which is deprecated but still > present. Remove that assignment, everything works. > > Note that the original symptom is that the *audio* crashes, and the cause is > in the setup of the *video* session. It turns out that while the audio > initialization crashed the program, if I got around that (e.g. the 10% of the > time it didn’t crash), the video capture didn’t work – the program didn’t > crash, but no video was captured. > > I’ve considered random scribbling in memory someplace from my application > since I began this investigation. Evidence does not support that theory, > although it cannot (being practical) be disproven. > > The need for weeks of experimentation when APIs change, and the rapid pace of > API change, are not giving me a positive feeling toward Apple. It’s sad, > because they do a lot of really good stuff. > > Steven J. Clark > VGo Communications > > From: R_Adams [mailto:[email protected] <mailto:[email protected]>] > Sent: Wednesday, October 29, 2014 2:41 PM > To: Steven Clark > Cc: [email protected] <mailto:[email protected]> > Subject: Re: App works on iOS 7.1, fails on iOS 8.1 > > I’ve discovered that some upgrades from 8.0 to 8.1 may leave the keyboard in > a state where geometry is invalid and dismiss animation is missing. If you > are doing any animation or view positioning base on the keyboard, turn “OFF” > split keyboard in settings. > > Long shot > > > On Oct 29, 2014, at 12:30 PM, Steven Clark <[email protected] > <mailto:[email protected]>> wrote: > > > I have an overly complicated VOIP app that I recently upgraded from targeting > iOS 7.1 to iOS 8.1. When built for 8.1, it runs fine on iOS 7.x but dies > about 90% of the time on iOS 8.1. > > It contains a single VPIO Audio Unit. The call AudioOutputUnitStart() fails, > returning -50 – which is, according to macerror, “error in user parameter > list”. Sometimes, I see the following line in the output when it fails: > > 2014-10-29 14:08:21.879 VGo Test 3[2145:888062] 14:08:21.878 ERROR: > [0x331649dc] >aurioc> 806: failed: -50 (enable 3, outf< 1 ch, 16000 Hz, > Int16> inf< 1 ch, 16000 Hz, Int16>) > > I can decipher the channel formats, and they are what I set for the > application side of the VPIO unit. Does anyone have a clue what “>aurioc> > 806” means? I got nothing useful with Google. > > When it works, everything seems to be fine. I haven’t been able to find > anything different between when it works and when it doesn’t. > > I threw in some code to print out a bunch of the Audio Unit’s properties just > before calling AudioOutputUnitStart(), and everything looks fine except > kAUVoiceIOProperty_VoiceProcessingEnableAGC. AudioUnitGetProperty() returns > -50 when getting this property, when and only when AudioOutputUnitStart() > also returns -50. About 9 other properties are all fine, though. > > I’ve tried instantiating a new VPIO Audio Unit when AudioOutputUnitStart() > fails. Its properties, including EnableAGC, all print out fine, and then the > app crashes. > > If you don’t have any ideas related to these problems, perhaps you might know > of any Core Audio changes between 7.x and 8.1? I found nothing interesting > in the official Apple release notes. > > Thank you very much, > > Steven J. Clark > VGo Communications > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Coreaudio-api mailing list ([email protected] > <mailto:[email protected]>) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/r4eemesa%40gmail.com > <https://lists.apple.com/mailman/options/coreaudio-api/r4eemesa%40gmail.com> > > This email sent to [email protected] <mailto:[email protected]> > > > > å > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Coreaudio-api mailing list ([email protected] > <mailto:[email protected]>) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/gregc%40apple.com > <https://lists.apple.com/mailman/options/coreaudio-api/gregc%40apple.com> > > This email sent to [email protected] <mailto:[email protected]>
_______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com This email sent to [email protected]
