iOS: Audio Recording File Format

Question

I am implementing the Audio recording. It works fine with caf & wave format. But the problem is file size is too big.

So, can anyone h

Answer 1

Here are my settings for high quality and small file size (on balance):

NSDictionary *recordSettings = @{AVEncoderAudioQualityKey: @(AVAudioQualityMedium),
                                 AVFormatIDKey: @(kAudioFormatMPEG4AAC),
                                 AVEncoderBitRateKey: @(128000),
                                 AVNumberOfChannelsKey: @(1),
                                 AVSampleRateKey: @(44100)};

This gives you a close to cd quality mono AAC track. You should append the file with .m4a to be readable everywhere. All other parameters get set to device defaults, which is what you want to happen in most cases.