.wav to any compressed form from AVAssetWritter ios

Question

Well the problem I am facing right now is a size issue problem. I am allowing the user to to choose a song from their library and then chop it up into pieces and then be able to

Answer 1

How about this (sorry for not trying it myself but it should get you closer):

AVAssetWriter *assetWriter = [AVAssetWriter assetWriterWithURL:exportURL
                                                       fileType:AVFileTypeAppleM4A
                                                          error:&assetError];

NSDictionary *outputSettings = [NSDictionary dictionaryWithObjectsAndKeys:
       [NSNumber numberWithInt: kAudioFormatMPEG4AAC], AVFormatIDKey,
       [NSNumber numberWithFloat:44100.0], AVSampleRateKey,
       [NSNumber numberWithInt:2], AVNumberOfChannelsKey,
       [NSNumber numberWithInt:128000], AVEncoderBitRateKey,
       [NSNumber numberWithInt:16], AVLinearPCMBitDepthKey,
       [NSNumber numberWithInt: AVAudioQualityHigh],  AVEncoderAudioQualityKey,
       nil];