[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error: &setCategoryError];
    if (setCategoryError){
        NSLog(@"Error setting category! %@", [setCategoryError localizedDescription]);
        return NO;
    }


    NSError *error = NULL;
    NSMutableDictionary *options = [NSMutableDictionary dictionaryWithCapacity:5];

    [options setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey]; //format
    [options setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; //sample rate
    [options setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey]; //channels
    //encoder
    [options setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey]; //channels
    [options setValue:[NSNumber numberWithInt:16] forKey:AVEncoderBitDepthHintKey]; //channels

self.audiorecorder = [[AVAudioRecorder alloc] initWithURL:mediaURL settings:options error:&error];
self.audiorecorder.meteringEnabled = YES;