So I have two audio files, same format, potentially different length. I would like to combine these files (overlay the audio from one onto the other, NOT join them at ends).
Lets say I have two files:
What I'd like, a combines audio file:
Appreciate everyone's help!
Tap a track header to select it, tap the track header again, then tap Merge. In the track header area, tap the circles for the additional tracks you want to merge. Tap Merge in the upper-right corner.
When you need to merge several songs into a single composition, the easiest way is to use our Online Audio Joiner application. It works in a browser window and you can join MP3 and other format files without installing the software on your computer. Open Online Audio Joiner website.
Here's what I did in my app.
- (void) setUpAndAddAudioAtPath:(NSURL*)assetURL toComposition:(AVMutableComposition *)composition
{
AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL:assetURL options:nil];
AVMutableCompositionTrack *track = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *sourceAudioTrack = [[songAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
NSError *error = nil;
BOOL ok = NO;
CMTime startTime = CMTimeMakeWithSeconds(0, 1);
CMTime trackDuration = songAsset.duration;
//CMTime longestTime = CMTimeMake(848896, 44100); //(19.24 seconds)
CMTimeRange tRange = CMTimeRangeMake(startTime, trackDuration);
//Set Volume
AVMutableAudioMixInputParameters *trackMix = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track];
[trackMix setVolume:0.8f atTime:startTime];
[self.audioMixParams addObject:trackMix];
//Insert audio into track
ok = [track insertTimeRange:tRange ofTrack:sourceAudioTrack atTime:CMTimeMake(0, 44100) error:&error];
}
- (IBAction)saveRecording
{
AVMutableComposition *composition = [AVMutableComposition composition];
audioMixParams = [[NSMutableArray alloc] initWithObjects:nil];
//IMPLEMENT FOLLOWING CODE WHEN WANT TO MERGE ANOTHER AUDIO FILE
//Add Audio Tracks to Composition
NSString *URLPath1 = [[NSBundle mainBundle] pathForResource:@"mysound" ofType:@"mp3"];
NSString *URLPath2 = [[NSBundle mainBundle] pathForResource:@"mysound2" ofType:@"mp3"];
NSURL *assetURL1 = [NSURL fileURLWithPath:URLPath1];
[self setUpAndAddAudioAtPath:assetURL1 toComposition:composition];
NSURL *assetURL2 = [NSURL fileURLWithPath:URLPath2];
[self setUpAndAddAudioAtPath:assetURL2 toComposition:composition];
AVMutableAudioMix *audioMix = [AVMutableAudioMix audioMix];
audioMix.inputParameters = [NSArray arrayWithArray:audioMixParams];
//If you need to query what formats you can export to, here's a way to find out
NSLog (@"compatible presets for songAsset: %@",
[AVAssetExportSession exportPresetsCompatibleWithAsset:composition]);
AVAssetExportSession *exporter = [[AVAssetExportSession alloc]
initWithAsset: composition
presetName: AVAssetExportPresetAppleM4A];
exporter.audioMix = audioMix;
exporter.outputFileType = @"com.apple.m4a-audio";
NSURL *exportURL = [NSURL fileURLWithPath:exportFile];
exporter.outputURL = exportURL;
// do the export
[exporter exportAsynchronouslyWithCompletionHandler:^{
int exportStatus = exporter.status;
NSError *exportError = exporter.error;
switch (exportStatus) {
case AVAssetExportSessionStatusFailed:
break;
case AVAssetExportSessionStatusCompleted: NSLog (@"AVAssetExportSessionStatusCompleted");
break;
case AVAssetExportSessionStatusUnknown: NSLog (@"AVAssetExportSessionStatusUnknown"); break;
case AVAssetExportSessionStatusExporting: NSLog (@"AVAssetExportSessionStatusExporting"); break;
case AVAssetExportSessionStatusCancelled: NSLog (@"AVAssetExportSessionStatusCancelled"); break;
case AVAssetExportSessionStatusWaiting: NSLog (@"AVAssetExportSessionStatusWaiting"); break;
default: NSLog (@"didn't get export status"); break;
}
}];
}
Beware that I did do this a while ago, and you might have to work with it a tiny bit to make it work. But it did work at one point. Let me know if you're having problems.
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