ios录音加背景音乐（ios怎么提取视频背景音乐）

话不多说，请看代码：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 //抽取原视频的音频与需要的音乐混合 -(void)addmusic:(id)sender { [MBProgressHUDshowHUDAddedTo:self.viewanimated:YES]; AVMutableComposition *composition =[AVMutableCompositioncomposition]; audioMixParams =[[NSMutableArrayalloc]initWithObjects:nil]; //录制的视频 NSURL *video_inputFileUrl =[NSURLfileURLWithPath:self.videoPath]; AVURLAsset *songAsset =[AVURLAssetURLAssetWithURL:video_inputFileUrloptions:nil]; CMTime startTime =CMTimeMakeWithSeconds(0,songAsset.duration.timescale); CMTime trackDuration =songAsset.duration; //获取视频中的音频素材 [selfsetUpAndAddAudioAtPath:video_inputFileUrltoComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake(14*44100,44100)]; //本地要插入的音乐 NSString *bundleDirectory =[[NSBundlemainBundle]bundlePath]; NSString *path = [bundleDirectorystringByAppendingPathComponent:@"30secs.mp3"]; NSURL *assetURL2 =[NSURLfileURLWithPath:path]; //获取设置完的本地音乐素材 [selfsetUpAndAddAudioAtPath:assetURL2toComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake(0,44100)]; //创建一个可变的音频混合 AVMutableAudioMix *audioMix =[AVMutableAudioMixaudioMix]; audioMix.inputParameters =[NSArrayarrayWithArray:audioMixParams];//从数组里取出处理后的音频轨道参数 //创建一个输出 AVAssetExportSession *exporter =[[AVAssetExportSessionalloc] initWithAsset:composition presetName:AVAssetExportPresetAppleM4A]; exporter.audioMix = audioMix; exporter.outputFileType=@"com.apple.m4a-audio"; NSString* fileName =[NSStringstringWithFormat:@"%@.mov",@"overMix"]; //输出路径 NSString *exportFile =[NSStringstringWithFormat:@"%@/%@",[selfgetLibarayPath], fileName]; if([[NSFileManagerdefaultManager]fileExistsAtPath:exportFile]) { [[NSFileManagerdefaultManager]removeItemAtPath:exportFileerror:nil]; } NSLog(@"是否在主线程1%d",[NSThreadisMainThread]); NSLog(@"输出路径===%@",exportFile); NSURL *exportURL =[NSURLfileURLWithPath:exportFile]; exporter.outputURL = exportURL; self.mixURL =exportURL; [exporterexportAsynchronouslyWithCompletionHandler:^{ int exportStatus =(int)exporter.status; switch (exportStatus){ caseAVAssetExportSessionStatusFailed:{ NSError *exportError =exporter.error; NSLog(@"错误，信息: %@", exportError); [MBProgressHUDhideHUDForView:self.viewanimated:YES]; break; } caseAVAssetExportSessionStatusCompleted:{ NSLog(@"是否在主线程2%d",[NSThreadisMainThread]); NSLog(@"成功"); //最终混合 [selftheVideoWithMixMusic]; break; } } }]; } //最终音频和视频混合 -(void)theVideoWithMixMusic { NSError *error =nil; NSFileManager *fileMgr =[NSFileManagerdefaultManager]; NSString *documentsDirectory =[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSString *videoOutputPath =[documentsDirectorystringByAppendingPathComponent:@"test_output.mp4"]; if ([fileMgrremoveItemAtPath:videoOutputPatherror:&error]!=YES) { NSLog(@"无法删除文件，错误信息：%@",[error localizedDescription]); } //声音来源路径（最终混合的音频） NSURL *audio_inputFileUrl =self.mixURL; //视频来源路径 NSURL *video_inputFileUrl = [NSURLfileURLWithPath:self.videoPath]; //最终合成输出路径 NSString *outputFilePath =[documentsDirectorystringByAppendingPathComponent:@"final_video.mp4"]; NSURL *outputFileUrl = [NSURLfileURLWithPath:outputFilePath]; if([[NSFileManagerdefaultManager]fileExistsAtPath:outputFilePath]) [[NSFileManagerdefaultManager]removeItemAtPath:outputFilePatherror:nil]; CMTime nextClipStartTime =kCMTimeZero; //创建可变的音频视频组合 AVMutableComposition* mixComposition =[AVMutableCompositioncomposition]; //视频采集 AVURLAsset* videoAsset =[[AVURLAssetalloc]initWithURL:video_inputFileUrloptions:nil]; CMTimeRange video_timeRange =CMTimeRangeMake(kCMTimeZero,videoAsset.duration); AVMutableCompositionTrack*a_compositionVideoTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeVideopreferredTrackID:kCMPersistentTrackID_Invalid]; [a_compositionVideoTrackinsertTimeRange:video_timeRangeofTrack:[[videoAssettracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0]atTime:nextClipStartTimeerror:nil]; //声音采集 AVURLAsset* audioAsset =[[AVURLAssetalloc]initWithURL:audio_inputFileUrloptions:nil]; CMTimeRange audio_timeRange =CMTimeRangeMake(kCMTimeZero,videoAsset.duration);//声音长度截取范围==视频长度 AVMutableCompositionTrack*b_compositionAudioTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid]; [b_compositionAudioTrackinsertTimeRange:audio_timeRangeofTrack:[[audioAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]atTime:nextClipStartTimeerror:nil]; //创建一个输出 AVAssetExportSession* _assetExport =[[AVAssetExportSessionalloc]initWithAsset:mixCompositionpresetName:AVAssetExportPresetMediumQuality]; _assetExport.outputFileType =AVFileTypeQuickTimeMovie; _assetExport.outputURL =outputFileUrl; _assetExport.shouldOptimizeForNetworkUse=YES; self.theEndVideoURL=outputFileUrl; [_assetExportexportAsynchronouslyWithCompletionHandler: ^(void ) { [MBProgressHUDhideHUDForView:self.viewanimated:YES]; //播放 NSURL*url = [NSURLfileURLWithPath:outputFilePath]; MPMoviePlayerViewController *theMovie =[[MPMoviePlayerViewControlleralloc]initWithContentURL:url]; [selfpresentMoviePlayerViewControllerAnimated:theMovie]; theMovie.moviePlayer.movieSourceType=MPMovieSourceTypeFile; [theMovie.moviePlayerplay]; } ]; NSLog(@"完成！输出路径==%@",outputFilePath); } //通过文件路径建立和添加音频素材 - (void)setUpAndAddAudioAtPath:(NSURL*)assetURLtoComposition:(AVMutableComposition*)composition start:(CMTime)startdura:(CMTime)duraoffset:(CMTime)offset{ AVURLAsset *songAsset =[AVURLAssetURLAssetWithURL:assetURLoptions:nil]; AVMutableCompositionTrack *track =[compositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid]; AVAssetTrack *sourceAudioTrack =[[songAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]; NSError *error =nil; BOOL ok =NO; CMTime startTime = start; CMTime trackDuration = dura; CMTimeRange tRange =CMTimeRangeMake(startTime,trackDuration); //设置音量 //AVMutableAudioMixInputParameters（输入参数可变的音频混合） //audioMixInputParametersWithTrack（音频混音输入参数与轨道） AVMutableAudioMixInputParameters *trackMix =[AVMutableAudioMixInputParametersaudioMixInputParametersWithTrack:track]; [trackMixsetVolume:0.8fatTime:startTime]; //素材加入数组 [audioMixParamsaddObject:trackMix]; //Insert audio into track //offsetCMTimeMake(0, 44100) ok = [trackinsertTimeRange:tRangeofTrack:sourceAudioTrackatTime:kCMTimeInvaliderror:&error]; } #pragma mark - 保存路径 -(NSString*)getLibarayPath { NSFileManager *fileManager =[NSFileManagerdefaultManager]; NSArray* paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES); NSString* path = [pathsobjectAtIndex:0]; NSString *movDirectory = [pathstringByAppendingPathComponent:@"tmpMovMix"]; [fileManagercreateDirectoryAtPath:movDirectorywithIntermediateDirectories:YESattributes:nilerror:nil]; return movDirectory; }