How can I export a AVPlayer audio mp3 file using AVAssetExportSession?
<p>I am now trying to export an mp3 file that has been player using AVPlayer (using an url) so it doesn't have to be downloaded twice. </p>

<p>This is my sample code: </p>

<p>I've tried every outputFileType...</p>

<pre><code>    self.exporter = [[AVAssetExportSession alloc] initWithAsset:self.asset presetName:AVAssetExportPresetPassthrough];
        }

        NSError *error;

        NSLog(@"export.supportedFileTypes : %@",self.exporter.supportedFileTypes);
       //        "com.apple.quicktime-movie",
//        "com.apple.m4a-audio",
//        "public.mpeg-4",
//        "com.apple.m4v-video",
//        "public.3gpp",
//        "org.3gpp.adaptive-multi-rate-audio",
//        "com.microsoft.waveform-audio",
//        "public.aiff-audio",
//        "public.aifc-audio",
//        "com.apple.coreaudio-format"

        self.exporter.outputFileType = @"public.aiff-audio";
        self.exporter.shouldOptimizeForNetworkUse = YES;

        NSURL *a = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:&amp;error];

        NSURL *url = [a URLByAppendingPathComponent:@"filename.mp3"];

        NSString *filePath = [url absoluteString];

        self.exporter.outputURL = url;

        if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]){
            [self.exporter exportAsynchronouslyWithCompletionHandler:^{

                if (self.exporter.status == AVAssetExportSessionStatusCompleted)
                {

                    if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]){
                        NSLog(@"File doesn't exist at path");
                    }else {
                        NSLog@"File saved!");
}                    
                }
                else if(self.exporter.status == AVAssetExportSessionStatusFailed){
                    NSLog(@"Failed");
                }else if(self.exporter.status == AVAssetExportSessionStatusUnknown){
                    NSLog(@"Unknown");
                }else if(self.exporter.status == AVAssetExportSessionStatusCancelled){
                    NSLog(@"Cancelled");
                }else if(self.exporter.status == AVAssetExportSessionStatusWaiting){
                    NSLog(@"Waiting");
                }else if(self.exporter.status == AVAssetExportSessionStatusExporting){
                    NSLog(@"Exporting");
                }

                NSLog(@"Exporter error! : %@",self.exporter.error);

              }];

        }}else{
            NSLog(@"File already exists at path");
        }
</code></pre>

<p>If this is not possible to accomplish, is there any work around?</p>

<p>Also, as I can change the format of the audio file. What's the ideal type to work with AVAudioPlayer?</p>