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我正在用一组图像和一个音频文件创建一个电影，并将创建的电影保存到照片库中，在模拟器中我用我的图像和音频文件数组得到正确的电影，但是在设备中运行时我没有得到我的结果电影相反，我得到了我添加的视频（我在代码中使用的 OutPut.mov）来编写我的输出文件（混合音频和图像文件数组）。

这是我将混合音频和图像文件数组保存到照片库的代码：

AVMutableComposition* mixComposition = [AVMutableComposition composition];
NSString* audio_inputFilePath = [[NSBundle mainBundle] pathForResource:@"Ruler" ofType:@"caf"];
NSURL*    audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;


NSString *video_inputFilePath = [documentsDirectory stringByAppendingPathComponent:@"videoOutput1234videoOutput1234.mp4"];
NSLog(@"output url %@",video_inputFilePath);


NSURL*    video_inputFileUrl = [NSURL fileURLWithPath:video_inputFilePath];


NSString* outputFilePath = [[NSBundle mainBundle] pathForResource:@"OutPut" ofType:@"mov"];
NSURL*    outputFileUrl = [NSURL fileURLWithPath:outputFilePath];

if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) 
    [[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];


if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) 
    [[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];

CMTime nextClipStartTime = kCMTimeZero;

AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];
CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];

[a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime error:nil];



AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero, audioAsset.duration);
AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];


AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];   
_assetExport.outputFileType = @"com.apple.quicktime-movie";
_assetExport.outputURL = outputFileUrl;

[_assetExport exportAsynchronouslyWithCompletionHandler:^(void ) {[self saveVideoToAlbum:outputFilePath]; }       ];
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1 回答 1

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您必须将视频文件写入照片库路径，例如..

- (void)writeVideoToPhotoLibrary:(NSURL *)url
{
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

    [library writeVideoAtPathToSavedPhotosAlbum:url completionBlock:^(NSURL *assetURL, NSError *error){
        if (error) {
            NSLog(@"Video could not be saved");
        }
    }];
    [library release];
}

- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    // Let's see what happened
    NSLog(@"finished");
    NSLog(@":error : %@", error);
}

于 2012-12-31T09:15:13.360 回答