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    <p>You can try to add this line:</p> <pre><code>[exportAudioMixInputParameters setVolume:0.0 atTime:CMTimeMakeWithSeconds(start-0.01, 1)]; </code></pre> <p>Before:</p> <pre><code>[exportAudioMixInputParameters setVolumeRampFromStartVolume:0.0 toEndVolume:1.0 timeRange:fadeInTimeRange]; </code></pre> <p>Sample Code:</p> <pre><code>//trim CMTime startTrimTime = CMTimeMakeWithSeconds(start, 1); CMTime endTrimTime = CMTimeMakeWithSeconds(start+length, 1); CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTrimTime, endTrimTime); exportSession.timeRange = exportTimeRange; //add fade in, fade out AVMutableAudioMix *exportAudioMix = [AVMutableAudioMix audioMix]; NSMutableArray* inputParameters = [NSMutableArray arrayWithCapacity:1]; NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeAudio]; for(AVAssetTrack *track in tracks) { //NSLog(@"track:%@", track); CMTime startFadeInTime = startTrimTime; CMTime endFadeInTime = CMTimeMakeWithSeconds(start + 4.0, 1); CMTimeRange fadeInTimeRange = CMTimeRangeFromTimeToTime(startFadeInTime, endFadeInTime); CMTime startFadeOutTime = CMTimeMakeWithSeconds(start+length - 4.0, 1); CMTime endFadeOutTime = endTrimTime; CMTimeRange fadeOutTimeRange = CMTimeRangeFromTimeToTime(startFadeOutTime, endFadeOutTime); //AVMutableAudioMixInputParameters *exportAudioMixInputParameters = [AVMutableAudioMixInputParameters audioMixInputParameters]; AVMutableAudioMixInputParameters *exportAudioMixInputParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track]; [exportAudioMixInputParameters setVolume:0.0 atTime:CMTimeMakeWithSeconds(start-0.01, 1)]; [exportAudioMixInputParameters setVolumeRampFromStartVolume:0.0 toEndVolume:1.0 timeRange:fadeInTimeRange]; [exportAudioMixInputParameters setVolumeRampFromStartVolume:1.0 toEndVolume:0.0 timeRange:fadeOutTimeRange]; [inputParameters addObject:exportAudioMixInputParameters]; } exportAudioMix.inputParameters = inputParameters; exportSession.audioMix = exportAudioMix; </code></pre>
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    1. COldmiao, thanks a lot for reply! But it doesn't work for AVAssetExportSession :(((( It works fine only for AVAssetReaderAudioMixOutput.
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    2. COWhere is "start" defined?
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    3. COyourfriendzak, thanks for reply, but now it's really old project. I don't remember.
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