Question

我已经浏览了几个新GPUImageUIElementFilter的示例，并尝试将它们应用于我从磁盘上获得的视频，但我正在获取“白屏”视频。我已尝试使用其他过滤器（sepia，pixelate）运行代码，它似乎工作正常，但与ui元素的混合失败。

这是我的代码：

//Declared in interface

@property(nonatomic, strong) GPUImageMovieWriter *movieWriter;
@property(nonatomic, strong) GPUImageMovie *movieFile;
@property(nonatomic, strong) GPUImageFilter *blendFilter;
@property(nonatomic, strong) GPUImageUIElement *uiElementFilter;



- (void)videoOutputOverlay {

  self.movieFile = [[GPUImageMovie alloc] initWithURL:self.post.url];
  self.movieFile.runBenchmark = YES;
  self.movieFile.playAtActualSpeed = YES;
  self.blendFilter = [[GPUImageAlphaBlendFilter alloc] init];
  ((GPUImageAlphaBlendFilter *)self.blendFilter).mix = 1.0;
  self.drawingView.backgroundColor = [UIColor clearColor];

  self.uiElementFilter = [[GPUImageUIElement alloc] initWithView:self.drawingView];
  [self.movieFile addTarget:self.blendFilter];
  [self.uiElementFilter addTarget:self.blendFilter];

  // In addition to displaying to the screen, write out a processed version of the movie to disk
  NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Output.m4v"];
  unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
  NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

  self.movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(640.0, 480.0)];
  [self.blendFilter addTarget:self.movieWriter];

  // Configure this for video from the movie file, where we want to preserve all video frames and audio samples
  self.movieWriter.shouldPassthroughAudio = YES;
  self.movieFile.audioEncodingTarget = self.movieWriter;
  [self.movieFile enableSynchronizedEncodingUsingMovieWriter:self.movieWriter];

  [self.movieWriter startRecording];
  [self.movieFile startProcessing];

  __weak PostPreviewViewController *weakSelf = self;
  [self.movieWriter setCompletionBlock:^{
    [weakSelf.blendFilter removeTarget:weakSelf.movieWriter];
    [weakSelf.movieWriter finishRecording];

    UISaveVideoAtPathToSavedPhotosAlbum(pathToMovie, nil, NULL, NULL);

    NSLog(@"completed saving movie");

  }];
}

这几乎是从网上的一些例子中完全复制的，主要区别在于我使用的文件不是直播视频。

在我的“相机胶卷”中导出的视频中，我可以听到音频+所有与其他滤镜一起使用的内容，因此我确信视频正确加载（加上导出时没有出现任何错误）

我假设我设置过滤器/目标的方式有问题。

非常感谢任何帮助！感谢

Answer 1

如果有人碰到这个问题，我能够在某种程度上解决它（现在我的情况下只是缺少声音）。这是我的代码，介意它有一些项目特定的东西，但是相当通用，否则

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GPUImageUIElementFilter返回带有白屏的视频

1 个答案: