IOS - 合併兩個音頻並把它作爲一個MP3格式

這裏我有兩個音頻文件，我成功地結合這兩種音頻文件，但它的回報率只有.m4a的格式，我需要mp3格式IOS - 合併兩個音頻並把它作爲一個MP3格式

- (BOOL) combineVoices1 
{ 
    NSError *error = nil; 
    BOOL ok = NO; 


    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 


    CMTime nextClipStartTime = kCMTimeZero; 
    //Create AVMutableComposition Object.This object will hold our multiple AVMutableCompositionTrack. 
    AVMutableComposition *composition = [[AVMutableComposition alloc] init]; 

    AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; 
    [compositionAudioTrack setPreferredVolume:0.8]; 
    NSString *soundOne =[[NSBundle mainBundle]pathForResource:@"test1" ofType:@"caf"]; 
    NSURL *url = [NSURL fileURLWithPath:soundOne]; 
    AVAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil]; 
    NSArray *tracks = [avAsset tracksWithMediaType:AVMediaTypeAudio]; 
    AVAssetTrack *clipAudioTrack = [[avAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; 
    [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, avAsset.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil]; 

    AVMutableCompositionTrack *compositionAudioTrack1 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; 
    [compositionAudioTrack setPreferredVolume:0.3]; 
    NSString *soundOne1 =[[NSBundle mainBundle]pathForResource:@"test" ofType:@"caf"]; 
    NSURL *url1 = [NSURL fileURLWithPath:soundOne1]; 
    AVAsset *avAsset1 = [AVURLAsset URLAssetWithURL:url1 options:nil]; 
    NSArray *tracks1 = [avAsset1 tracksWithMediaType:AVMediaTypeAudio]; 
    AVAssetTrack *clipAudioTrack1 = [[avAsset1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; 
    [compositionAudioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero, avAsset.duration) ofTrack:clipAudioTrack1 atTime:kCMTimeZero error:nil]; 


    AVMutableCompositionTrack *compositionAudioTrack2 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; 
    [compositionAudioTrack2 setPreferredVolume:1.0]; 
    NSString *soundOne2 =[[NSBundle mainBundle]pathForResource:@"song" ofType:@"caf"]; 
    NSURL *url2 = [NSURL fileURLWithPath:soundOne2]; 
    AVAsset *avAsset2 = [AVURLAsset URLAssetWithURL:url2 options:nil]; 
    NSArray *tracks2 = [avAsset2 tracksWithMediaType:AVMediaTypeAudio]; 
    AVAssetTrack *clipAudioTrack2 = [[avAsset2 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; 
    [compositionAudioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero, avAsset2.duration) ofTrack:clipAudioTrack2 atTime:kCMTimeZero error:nil]; 



    AVAssetExportSession *exportSession = [AVAssetExportSession 
              exportSessionWithAsset:composition 
              presetName:AVAssetExportPresetAppleM4A]; 
    if (nil == exportSession) return NO; 

    NSString *soundOneNew = [documentsDirectory stringByAppendingPathComponent:@"combined10.m4a"]; 
    //NSLog(@"Output file path - %@",soundOneNew); 

    // configure export session output with all our parameters 
    exportSession.outputURL = [NSURL fileURLWithPath:soundOneNew]; // output path 
    exportSession.outputFileType = AVFileTypeAppleM4A; // output file type 

    // perform the export 
    [exportSession exportAsynchronouslyWithCompletionHandler:^{ 

     if (AVAssetExportSessionStatusCompleted == exportSession.status) { 
      NSLog(@"AVAssetExportSessionStatusCompleted"); 
     } else if (AVAssetExportSessionStatusFailed == exportSession.status) { 
      // a failure may happen because of an event out of your control 
      // for example, an interruption like a phone call comming in 
      // make sure and handle this case appropriately 
      NSLog(@"AVAssetExportSessionStatusFailed"); 
     } else { 
      NSLog(@"Export Session Status: %d", exportSession.status); 
     } 
    }]; 


    return YES; 


}

請任何機構請幫我

來源

2013-10-11 dineshprasanna

你好，我沒有你的答案，但我想知道你如何合併iOS SDK中的兩個音頻文件？您有任何示例代碼或項目，請提供給我鏈接或代碼。其實我找到這種類型的例子。 –

你是在嘗試轉換爲MP3的麻煩世界。涉及昂貴的專利許可證。你可以找到尋找解決方案的人的問題，而且沒有好的迴應。

如果你正在尋找只是爲自己做點事你自己，你可以嘗試FFmpeg的，但他們有一些非常嚴重的法律事項免責聲明此處

這條線尤其令人擔憂：

Q：將我整個FFmpeg核心納入我自己的商業產品完全可以嗎？

- 答：你可能在這裏有一個問題。已經有公司在其產品中使用FFmpeg的情況。這些公司發現，一旦你開始試圖通過專利技術賺錢，這些專利的所有者將在之後獲得許可費用。值得注意的是，MPEG LA對於收集MPEG相關技術的保持警惕和勤奮。

來源

2013-10-11 04:50:38 HalR

好的謝謝回覆先生 – dineshprasanna

IOS - 合併兩個音頻並把它作爲一個MP3格式

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