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    <p>Here's the code that I've used to trim audio from a pre-existing file. You'll need to change the M4A related constants if you've saved or are saving to another format.</p> <pre><code>- (BOOL)trimAudio { float vocalStartMarker = &lt;starting time&gt;; float vocalEndMarker = &lt;ending time&gt;; NSURL *audioFileInput = &lt;your pre-existing file&gt;; NSURL *audioFileOutput = &lt;the file you want to create&gt;; if (!audioFileInput || !audioFileOutput) { return NO; } [[NSFileManager defaultManager] removeItemAtURL:audioFileOutput error:NULL]; AVAsset *asset = [AVAsset assetWithURL:audioFileInput]; AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:asset presetName:AVAssetExportPresetAppleM4A]; if (exportSession == nil) { return NO; } CMTime startTime = CMTimeMake((int)(floor(vocalStartMarker * 100)), 100); CMTime stopTime = CMTimeMake((int)(ceil(vocalEndMarker * 100)), 100); CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, stopTime); exportSession.outputURL = audioFileOutput; exportSession.outputFileType = AVFileTypeAppleM4A; exportSession.timeRange = exportTimeRange; [exportSession exportAsynchronouslyWithCompletionHandler:^ { if (AVAssetExportSessionStatusCompleted == exportSession.status) { // It worked! } else if (AVAssetExportSessionStatusFailed == exportSession.status) { // It failed... } }]; return YES; } </code></pre> <p>There's also <a href="http://developer.apple.com/library/ios/#qa/qa1730/_index.html">Technical Q&amp;A 1730</a>, which gives a slightly more detailed approach.</p>
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    1. COvocalStartMarker and vocalEndMarker is in range [0,1], right?
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    2. COvocalStartMarker and vocalEndMarker are in seconds. For example, trimming the middle second of a 10 second clip, you'd set vocalStartMarker = 4.5 and vocalEndMarker = 5.5.
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    3. COI think we just use: CMTime startTime = CMTimeMake(vocalStartMarker, 1);
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