Deadlock on main thread for -[AEAudioFileWriter finishWriting] about theamazingaudioengine HOT 8 CLOSED

So before the final deadlock, in the screenshot above, it locks the main thread for exactly 9 seconds in -[AEAudioController housekeeping]:

from theamazingaudioengine.

This sounds like an iOS bug to me - none of that is anywhere near the user code, so I'm not sure this can be fixed!

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Ah, that's a bummer. It's definitely related to using the hardware video encoder after using TAAE, and then using TAAE again. For now I had to remove m4a support from my app to ship on time. :(

I'm wondering if I can record a .m4a another way by tricking the hardware video encoder to only write the audio frames into a .mp4 file, since it is essentially the same thing...

How resilient are TAAE's M4A files to interruptions like running out of battery or force quitting the app? The video encoder path allows you to chunk the file in increments as well to prevent data loss, but I haven't really tested it.

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Perhaps! I think the problem might be the way the hardware has to be put into certain modes in order to utilize the embedded encoders; have you played around with changing the audio session category at strategic times?

I don't know about resilience to interruptions - it's all just using ExtAudioFile under the hood, though.

It might be worth considering writing PCM format (AIFF, etc), then converting when it's time to export, if all else fails (this is what Loopy does, incidentally).

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Have you tried using the software m4a codec?

        UInt32 codecManf = kAppleSoftwareAudioCodecManufacturer;
        ExtAudioFileSetProperty(recAF, kExtAudioFileProperty_CodecManufacturer, sizeof(UInt32), &codecManf);

from theamazingaudioengine.

Closing this for now - I don't think this is a TAAE bug.

from theamazingaudioengine.

it's not a TAAE bug, so what's the reason?

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I suspect it has something to do with the hardware video encoder. There might be problems when it's used in tandem with the hardware AAC encoder, too. If you're still having problems, try the software codec that @lijon mentioned above. I'd be interested to hear the result.

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