我试图用一组图像制作视频，我找到了一些代码并让它工作

但是视频不会保存到照片库，它给我这个错误:

Documenta.mov 无法保存到已保存的相册:Error Domain=NSOSStatusErrorDomain Code=2 "This movie could not be played."UserInfo=0x922cf60 {NSLocalizedDescription=无法播放这部电影。}

这是我使用的代码:

 NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

    UIImage * i = [UIImage imageNamed:@"IMG_1650.JPG"];
    CGAffineTransform  transform = CGAffineTransformMakeRotation((M_PI/180)*90);
    GPUImageTransformFilter * filter = [[GPUImageTransformFilter alloc]init];
    [filter setAffineTransform:transform];
   UIImage * im = [filter imageByFilteringImage:i];
    im = [filter imageByFilteringImage:im];

    [self writeImagesToMovieAtPath:[NSString stringWithFormat:@"%@/%@",documentsDirectoryPath,@"a.mov"] withSize:CGSizeMake(i.size.width, i.size.height)];

    NSString* exportVideoPath = [NSString stringWithFormat:@"%@%@",documentsDirectoryPath,@"a.mov"];

    UISaveVideoAtPathToSavedPhotosAlbum (exportVideoPath,self, @selector(video:didFinishSavingWithError: contextInfo:), nil);

这是我用来创建视频的代码:

-(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size
{
    NSLog(@"Write Started");

    NSError *error = nil;

    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
                                  [NSURL fileURLWithPath:path] fileType:AVFileTypeQuickTimeMovie
                                                              error:&error];
    NSParameterAssert(videoWriter);

    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   AVVideoCodecH264, AVVideoCodecKey,
                                   [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                                   [NSNumber numberWithInt:size.height], AVVideoHeightKey,
                                   nil];

    AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput
                                             assetWriterInputWithMediaType:AVMediaTypeVideo
                                             outputSettings:videoSettings] retain];


    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
                                                     assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
                                                     sourcePixelBufferAttributes:nil];

    NSParameterAssert(videoWriterInput);
    NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
    videoWriterInput.expectsMediaDataInRealTime = YES;
    [videoWriter addInput:videoWriterInput];

    //Start a session:
    [videoWriter startWriting];
    [videoWriter startSessionAtSourceTime:kCMTimeZero];

    CVPixelBufferRef buffer = NULL;

    //convert uiimage to CGImage.

    int frameCount = 1;
    int kRecordingFPS = 30;
    UIImage * im = [UIImage imageNamed:@"IMG_1650.JPG"];

    CGAffineTransform  transform = CGAffineTransformMakeRotation((M_PI/180)*90);
    GPUImageTransformFilter * filter = [[GPUImageTransformFilter alloc]init];
    [filter setAffineTransform:transform];
    UIImage * i = [filter imageByFilteringImage:im];
    i = [filter imageByFilteringImage:im];
    NSArray * imageArray = [[NSArray alloc]initWithObjects:i,i,i,i,i,i,i,i,i,i,i,i,i,i,i,i, nil];

    for(UIImage * img in imageArray)
    {
        buffer = [self pixelBufferFromCGImage:[img CGImage] andSize:size];

        BOOL append_ok = NO;
        int j = 0;
        while (!append_ok && j < 30)
        {
            if (adaptor.assetWriterInput.readyForMoreMediaData)
            {
                printf("appending %d attemp %d\n", frameCount, j);

                CMTime frameTime = CMTimeMake(frameCount,(int32_t) kRecordingFPS);
                append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];

                if(buffer)
                    CVBufferRelease(buffer);
                [NSThread sleepForTimeInterval:0.05];
            }
            else
            {
                printf("adaptor not ready %d, %d\n", frameCount, j);
                [NSThread sleepForTimeInterval:0.1];
            }
            j++;
        }
        if (!append_ok) {
            printf("error appending image %d times %d\n", frameCount, j);
        }
        frameCount++;
    }


    //Finish the session:
    [videoWriterInput markAsFinished];
    [videoWriter finishWriting];
    NSLog(@"Write Ended");
}

我尝试使用

UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(videoPath)

我发现视频不兼容

但我不知道为什么或如何解决这个问题

最佳答案

视频路径

NSString* exportVideoPath = [NSString stringWithFormat:@"%@%@",documentsDirectoryPath,@"a.mov"]; 

错了。您缺少“/”分隔符。

改成这样

NSString* exportVideoPath = [NSString stringWithFormat:@"%@/%@",documentsDirectoryPath,@"a.mov"]; 

希望这能解决您的问题。

关于ios - 从图像数组创建视频并将其保存到相机胶卷，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13020023/