Presently, I want to setup an inexpensive prime quality sound recording, which consumes minimal disk home.
I try to make use of the following setup
- AVSampleRateKey: 8000 – “Cellphone and encrypted walkie-talkie, wi-fi intercom and wi-fi microphone transmission; passable for human speech nonetheless with out sibilance (ess seems like eff (/s/, /f/)).” From https://en.wikipedia.org/wiki/Sampling_(signal_processing)
- AVEncoderBitRateKey: 32000 – “32 kbit/s – usually acceptable only for speech”. From https://en.wikipedia.org/wiki/Bit_rate
If I benefit from the following settings for
let settings = [ AVFormatIDKey: Int(kAudioFormatMPEG4AAC), AVNumberOfChannelsKey: 1, AVSampleRateKey: 8000, AVEncoderBitRateKey: 32000, AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue ]
It could set off AudioCodecInitialize failed error all through
My current workaround is to do away with
AVEncoderBitRateKey, and apply the following settings.
let settings = [ AVFormatIDKey: Int(kAudioFormatMPEG4AAC), AVNumberOfChannelsKey: 1, AVSampleRateKey: 8000, AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue ]
However, I nonetheless wish to know, why 32000
AVEncoderBitRateKey will fail, and is there any method I can extra optimize, to realize low-cost prime quality and minimal disk home, for sound recording?