Question

我正在创建一个包含图像和音频文件的电影并将创建的电影保存到照片库，在模拟器中我使用我的图像和音频文件阵列获得正确的电影但是在设备中运行时我没有得到我得到的电影而不是我得到的视频我添加（我在我的代码中使用的OutPut.mov）来编写我的输出文件（混合音频和图像文件数组）。

这是我将我的混合音频和图像数组文件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]; }       ];

Answer 1

您必须将视频文件写入photolibrary路径，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);
}

- (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); }

没有在PhotoLibrary iPad中获得结果电影

1 个答案: