Objective c 将选定的音乐文件集成到视频中

我正在开发一个视频录制应用程序，我希望能够集成用户从iPod库中选择的音乐文件。请分享您对我如何达到这一要求的意见。示例代码非常有用。

最终成功地将选定的音乐文件集成到视频中

使用AVAssetExportSession，我们可以使用AVMutableComposition将视频和音频合并在一起

谢谢你们所有人的更新

//此方法合并音频和视频

- (void)mergeAudioAtUrl:(NSURL *)audioUrl withVideoAtUrl:(NSURL *)videoUrl toUrl:(NSURL *)outputUrl
  {

//_imageCaptureCount = [_imagesArray count]*100;

AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioUrl options:nil];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoUrl options:nil];

AVMutableComposition* mixComposition = [AVMutableComposition composition];


if([[audioAsset tracksWithMediaType:AVMediaTypeAudio] count])
{
    AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio 
                                                                                        preferredTrackID:kCMPersistentTrackID_Invalid];

    [compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) 
                                        ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
                                         atTime:kCMTimeZero error:nil];
}
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                                                                               preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) 
                               ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
                                atTime:kCMTimeZero error:nil];

[audioAsset release];
[videoAsset release];

AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition 
                                                                      presetName:AVAssetExportPresetPassthrough];   

NSURL    *exportUrl = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/Documents/%@Video.mp4", NSHomeDirectory(),pcNameString]];

if ([[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithFormat:@"%@/Documents/%@Video.mp4", NSHomeDirectory(),pcNameString]]) 
{
    [[NSFileManager defaultManager] removeItemAtPath:[NSString stringWithFormat:@"%@/Documents/%@Video.mp4", NSHomeDirectory(),pcNameString] error:nil];
}

_assetExport.outputFileType = @"com.apple.quicktime-movie"; //com.apple.m4v-video
_assetExport.outputURL = exportUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;

[_assetExport exportAsynchronouslyWithCompletionHandler:
 ^(void ) {      
     // your completion code here
    // NSLog(@"completed");

     removeProgresBarFlag = YES;


    /* NSString* savedVideoFilePath = [NSString stringWithFormat:@"%@/Documents/PC%d.mp4", NSHomeDirectory(),[videosListArray count]];

     if(UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(savedVideoFilePath))
     {
         [[UIApplication sharedApplication]beginIgnoringInteractionEvents];
         UISaveVideoAtPathToSavedPhotosAlbum(savedVideoFilePath, self, nil, nil);
         [[UIApplication sharedApplication]endIgnoringInteractionEvents];

     } */


     NSMutableDictionary* videoDetailDict = [[NSMutableDictionary alloc] initWithCapacity:0];

     NSStringEncoding encoding;
     NSError* error;

     NSString * persistentID;
     NSFileManager* fileManager = [NSFileManager defaultManager];

     if([fileManager fileExistsAtPath:PRESENTSONGS_FILE_PATH])
         persistentID = [NSString stringWithContentsOfFile:PRESENTSONGS_FILE_PATH usedEncoding:&encoding error:&error];
     else 
         persistentID = @"";

     [videoDetailDict setObject:persistentID forKey:KSong];

     if([fileManager fileExistsAtPath:PRESENTIMAGES_FILE])
     {

         NSMutableArray* currentImagesArray = [[NSMutableArray alloc] initWithContentsOfFile:IMAGESDATA_FILE_PATH];
         NSMutableArray* durationArray = [[NSMutableArray alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@/videoduration.plist", [[NSBundle mainBundle] resourcePath]]];
         [videoDetailDict setObject:[durationArray objectAtIndex:[currentImagesArray count]-1] forKey:KfileSize];
         [durationArray release];


         [videoDetailDict setObject:currentImagesArray forKey:KImagesList];
         if([fileManager fileExistsAtPath:TEMPVIDEO_FILE_PATH])
         [fileManager removeItemAtPath:TEMPVIDEO_FILE_PATH error:nil];

         NSString* mainPath;

             mainPath = [NSString stringWithFormat:@"%@/Documents/%@File",NSHomeDirectory(),pcNameString];

         if([fileManager fileExistsAtPath:mainPath])
             [fileManager removeItemAtPath:mainPath error:nil];

         [fileManager createDirectoryAtPath:mainPath withIntermediateDirectories:NO attributes:nil error:nil];


         for(int i=0;i<[currentImagesArray count];i++)
         {
             [fileManager copyItemAtPath:[NSString stringWithFormat:@"%@%@",PRESENTIMAGES_FILE,[currentImagesArray objectAtIndex:i]] toPath:[NSString stringWithFormat:@"%@/%@",mainPath,[currentImagesArray objectAtIndex:i]] error:nil];
         }
         [currentImagesArray release];

     }

     if([fileManager fileExistsAtPath:KMESSAGE_FILEPATH])
     {
         NSMutableDictionary* currentMessageDictioanry = [[NSMutableDictionary alloc] initWithContentsOfFile:KMESSAGE_FILEPATH];
         [videoDetailDict setObject:currentMessageDictioanry forKey:Kmessage];
         [currentMessageDictioanry release];
     }

     [videoDetailDict setObject:pcNameString forKey:KPostCardName]; //[NSString stringWithFormat:@"PostCard Video%d",[videosListArray count]]
     //[videosListArray insertObject:videoDetailDict atIndex:0];
     [videosListArray addObject:videoDetailDict];
     [videoDetailDict release];
     [videosListArray writeToFile:VIDEOS_FILE_PATH atomically:YES];

 }       
 ];
}

-（void）合并音频自然：（NSURL*）音频URL与视频自然：（NSURL*）视频URL旅游：（NSURL*）输出URL
{
//_imageCaptureCount=[\u imagesArray count]*100；
AVURLAsset*audioAsset=[[AVURLAsset alloc]initWithURL:audioUrl选项：nil]；
AVURLAsset*videoAsset=[[AVURLAsset alloc]initWithURL:videoUrl选项：nil]；
AVMutableComposition*mixComposition=[AVMutableComposition]；
if（[[audioAsset tracksWithMediaType:AVMediaTypeAudio]计数]）
{
AVMutableCompositionTrack*compositionCommentaryTrack=[mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCompersistentTrackID_无效]；
[compositionCommentaryTrack insertTimeRange:CMTimeRangeMake（kCMTimeZero，videoAsset.duration）
ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio]对象索引：0]
时间：kCMTimeZero错误：nil]；
}
AVMutableCompositionTrack*compositionVideoTrack=[mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCompersistentTrackID_无效]；
[compositionVideoTrack insertTimeRange:CMTimeRangeMake（kCMTimeZero，videoAsset.duration）
ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo]对象索引：0]
时间：kCMTimeZero错误：nil]；
[音频资产释放]；
[视频资产释放]；
AVAssetExportSession*\u assetExport=[[AVAssetExportSession alloc]initWithAsset:mixComposition
预设名称：AVAssetExportPresetPassthrough]；
NSURL*exportUrl=[NSURL fileURLWithPath:[NSString stringWithFormat:@“%@/Documents/%@Video.mp4”，NSHomeDirectory（），pcNameString]]；
如果（[[NSFileManager defaultManager]文件ExistSatPath:[NSString stringWithFormat:@“%@/Documents/%@Video.mp4”，NSHomeDirectory（），pcNameString]]））
{
[[NSFileManager defaultManager]removeItemAtPath:[NSString stringWithFormat:@“%@/Documents/%@Video.mp4”，NSHomeDirectory（），pcNameString]错误：nil]；
}
_assetExport.outputFileType=@“com.apple.quicktime电影”；//com.apple.m4v-video
_assetExport.outputURL=exportUrl；
_assetExport.shouldOptimizationForNetworkUse=是；
[\u assetExport exportAsynchronouslyWithCompletionHandler:
^（无效）{
//你的完成代码在这里
//NSLog（@“已完成”）；
removeProgresBarFlag=是；
/*NSString*savedVideoFilePath=[NSString stringWithFormat:@“%@/Documents/PC%d.mp4”，NSHomeDirectory（），[videosListArray计数]；
if（UIVideoAtPath与SavedPhotosAlbum（savedVideoFilePath）兼容）
{
[[UIApplication sharedApplication]beginIgnoringInteractionEvents]；
UISaveVideoAtPathToSavedPhotosAlbum（savedVideoFilePath，self，nil，nil）；
[[UIApplication sharedApplication]endIgnoringInteractionEvents]；
} */
NSMutableDictionary*videoDetailDict=[[NSMutableDictionary alloc]initWithCapacity:0]；
NSSTRING编码；
n错误*错误；
NSString*persistentID；
NSFileManager*fileManager=[NSFileManager defaultManager]；
if（[fileManager fileExistsAtPath:PRESENTSONGS\u FILE\u PATH]）
persistentID=[NSString stringWithContentsOfFile:PRESENTSONGS\u FILE\u使用的路径编码：&编码错误：&错误]；
其他的
persistentID=@”；
[videoDetailDict setObject:persistentID forKey:KSong]；
如果（[fileManager文件ExistSatPath:PRESENTIMAGES\u文件]）
{
NSMutableArray*currentImagesArray=[[NSMutableArray alloc]initWithContentsOfFile:IMAGESDATA_FILE_PATH]；
NSMutableArray*durationArray=[[NSMutableArray alloc]initWithContentsOfFile:[NSString stringWithFormat:@“%@/videoduration.plist”，[[NSBundle mainBundle]resourcePath]]；
[videoDetailDict setObject:[durationArray objectAtIndex:[currentImagesArray count]-1]forKey:KfileSize]；
[durationArray发布]；
[videoDetailDict setObject:currentImagesArray forKey:KImagesList]；
if（[fileManager fileExistsAtPath:TEMPVIDEO\u FILE\u PATH]）
[fileManager removeItemAtPath:TEMPVIDEO_文件_路径错误：nil]；
NSString*主路径；
mainPath=[NSString stringWithFormat:@“%@/Documents/%@文件”，NSHomeDirectory（），pcNameString]；
如果（[fileManager fileExistsAtPath:mainPath]）
[fileManager removeItemAtPath:mainPath错误：无]；
[fileManager createDirectoryAtPath:mainPath with IntermediateDirectory:无属性：nil错误：nil]；
对于（int i=0；iHi，你能帮我吗？我正在处理同一个用例，但无法在合并文件中获取视频。我能够获取AVAssetExportSessionStatusCompleted状态，但无法查看视频。我已检查了我的视频文件，它是正确的。我的音频文件也是正确的…但在合并两个视频时，不会显示视频。…你能告诉我有什么问题吗？更新我的答案，检查一下！