Use GPUImageMovie, GPUImageFilterGroup to process local video

[biyuhuaping]

我想实现一个调节本地视频的功能，比如调整曝光度，用滑块调节，视频样式就跟着改变，并显示出来。请问我该怎么做。非常感谢

[biyuhuaping]

是的，我就是这么做的，但是只有视频播放的时候，才显示调节效果，而视频暂停时，不能显示调节效果，请问我该怎么做？非常感谢！

我的代码是这样写的：

• (void)configPlayerView{ self.playerItem = [[AVPlayerItem alloc]initWithURL:self.segment.url]; self.player = [AVPlayer playerWithPlayerItem:self.playerItem];

  self.movieFile = [[GPUImageMovie alloc] initWithPlayerItem:self.playerItem]; self.movieFile.delegate = self; self.movieFile.playAtActualSpeed = YES;

  _brightnessFilter = [[GPUImageBrightnessFilter alloc] init]; [_brightnessFilter addTarget:self.gpuImageView]; [self.movieFile addTarget:_brightnessFilter]; [self.movieFile startProcessing]; [self.playButton setImage:[UIImage imageNamed:@"播放"] forState:UIControlStateNormal]; }

• (IBAction)updateSliderValue:(UISlider *)sender{ _brightnessFilter.brightness = sender.value; }