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私は2つの方法を書いた

  • オーディオを生成するもの
  • ビデオにオーディオを追加する別の

「AVAssetExportSession」を使用してこれらの両方を行い、AVassetExportSession クラスの「exportAsynchronouslyWithCompletionHandler」でいくつかの操作を実行します

これは、オーディオを生成するコードです

AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition 
                                                                      presetName:AVAssetExportPresetAppleM4A];   

NSString *outputUrl = [NSString stringWithFormat:@"%@/Video/%@",userDocumentsPath,@"finalAudio.m4a"];
//Specifing the output file where we want to store our fianl asset
_assetExport.outputFileType = AVFileTypeAppleM4A;
NSURL *finalUrl = [[NSURL alloc] initFileURLWithPath:outputUrl isDirectory:NO];
BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:finalUrl.path];
//deleting file if it exists
if (fileExists)
{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    [fileManager removeItemAtPath:finalUrl.path error:NULL];
}

_assetExport.outputURL = finalUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;
_assetExport.audioMix = audioMix;
__block ICImageToVideo *temp = self;

[_assetExport exportAsynchronouslyWithCompletionHandler:
 ^(void ) 
 {
     NSString *documentsPath = nil;
     NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     if ([filePaths count] > 0) 
     {
         documentsPath = [filePaths objectAtIndex:0];
     }


     NSString *audioPath = [NSString stringWithFormat:@"%@/Video/%@",documentsPath,@"finalAudio.m4a"];

     NSURL *finalAudio = [[NSURL alloc] initFileURLWithPath:audioPath isDirectory:NO];
     temp.audioUrl = finalAudio;

     [temp addAudioToVideo];

     [finalAudio release]; 
     [_assetExport release]; 
 }];

オーディオをビデオに追加するコードは次のとおりです。

- (void)addAudioToVideo
{
NSString *userDocumentsPath = nil;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
if ([paths count] > 0) 
{
    userDocumentsPath = [paths objectAtIndex:0];
}
NSURL *videoUrl = [[NSURL alloc] initFileURLWithPath:self.videoUrl] ;

//    NSString* audio = [[NSBundle mainBundle] pathForResource:@"sample" ofType:@"mp3"];
//    NSURL *audioUrl = [[NSURL alloc] initFileURLWithPath:audio];

if (self.audioUrl || videoUrl) 
{
    NSLog(@"Found the URLs!");
}

//Used to denote an audoi/video asset taken from the url
//https://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVURLAsset_Class/Reference/Reference.html

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

//Used to denote a set of AVCompositionMutableTrack 's to create a custom combination from combining them
//https://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVMutableComposition_Class/Reference/Reference.html

AVMutableComposition* mixComposition = [AVMutableComposition composition];

//Used to allow us to make a low level composition of tracks
//https://developer.apple.com/library/ios/#DOCUMENTATION/AVFoundation/Reference/AVMutableCompositionTrack_Class/Reference/Reference.html
AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio 
                                                                                    preferredTrackID:kCMPersistentTrackID_Invalid];

//Here we insert a custom asset into a track of our mutable track composition at the specified time
[compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration ) 
                                    ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
                                     atTime:kCMTimeZero error:nil];



NSLog(@"Audio Duration : %f",CMTimeGetSeconds(audioAsset.duration));
NSLog(@"Video Duration : %f",CMTimeGetSeconds(videoAsset.duration));

int difference = CMTimeCompare(videoAsset.duration, audioAsset.duration);
NSLog(@"Difference = %d",difference);

//We create another mutable composition track to hold the video that we need to insert into our final asset
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                                                                               preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) 
                               ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
                                atTime:kCMTimeZero error:nil];

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

NSString *outputUrl = [NSString stringWithFormat:@"%@/Video/%@",userDocumentsPath,@"final.mov"];
//Specifing the output file where we want to store our fianl asset
_assetExport.outputFileType = @"com.apple.quicktime-movie";
NSLog(@"file type %@",_assetExport.outputFileType);
NSURL *finalUrl = [[NSURL alloc] initFileURLWithPath:outputUrl isDirectory:NO];
BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:finalUrl.path];
//deleting file if it exists
if (fileExists)
{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    [fileManager removeItemAtPath:finalUrl.path error:NULL];
}

_assetExport.outputURL = finalUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;

__block ICImageToVideo *temp = self;
[_assetExport exportAsynchronouslyWithCompletionHandler:
 ^(void ) 
 {
     NSString *documentsPath = nil;
     NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     if ([filePaths count] > 0) 
     {
         documentsPath = [filePaths objectAtIndex:0];
     }

     NSString *videopath = [NSString stringWithFormat:@"%@/Video/%@",documentsPath,@"final.mov"];
     NSLog(@"videoPAth: %@",videopath);

     BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:temp.videoUrl];
     //deleting file if it exists
     if (fileExists)
     {
         NSFileManager *fileManager = [NSFileManager defaultManager];
         [fileManager removeItemAtPath:temp.videoUrl error:NULL];

         NSURL* tempSrcURL = [[NSURL alloc] initFileURLWithPath:videopath];
         NSURL* sourceUrl = tempSrcURL;
         //[tempSrcURL release]; //[NEW LEAK FIXED]
         //NSURL *sourceUrl = [[NSURL alloc] initFileURLWithPath:videopath];

         NSURL* tempDestURL = [[NSURL alloc] initFileURLWithPath:temp.videoUrl];
         NSURL* destinationUrl = tempDestURL;
         //[tempDestURL release]; //[NEW LEAK FIXED]
         //NSURL *destinationUrl = [[NSURL alloc]initFileURLWithPath:self.videoUrl];

         [fileManager moveItemAtURL:sourceUrl toURL:destinationUrl error:nil];
         [tempSrcURL release]; //[NEW LEAK FIXED]
         [tempDestURL release]; //[NEW LEAK FIXED]
     }
     [temp.delegate didProgressVideoGenereation:1];
     [temp.delegate didFinishPreparingVideoWithUrl:self.videoUrl];
     [_assetExport release];
 }];

[audioAsset release];
[videoAsset release];
[videoUrl release];
[finalUrl release];
}

ブロックの両方または 1 つでリークが発生しているようですが、リーク ツールまたは静的アナライザーを使用して問題を特定できませんでした。

どんな提案も役に立ちます。

4

2 に答える 2

1

使用する 2 番目のブロックではselfなく、__block temp

 [temp.delegate didFinishPreparingVideoWithUrl:self.videoUrl];

する必要があります

 [temp.delegate didFinishPreparingVideoWithUrl: temp.videoUrl];

_assetExportブロックで直接リリースするのではなく_assetExport、オブジェクト変数に保存しreleaseてdeallocメソッドに保存します

于 2012-05-16T12:32:39.280 に答える
0

self.videoUrl一番下のブロックでは、上で定義した変更可能なブロック変数を使用する代わりにアクセスしtemp.videoUrlています。

于 2012-05-16T11:27:48.257 に答える