本文内容：

1、播放本地视频，实时添加滤镜，修改不同的滤镜效果

2、给本地视频添加滤镜，然后保存有滤镜效果的视频到本地

1、播放本地视频，实时添加滤镜，修改不同的滤镜效果

/** 播放视频，实时添加滤镜 */- (void)playVideo{    NSURL *sampleURL = [[NSBundle mainBundle]URLForResource:@"demo" withExtension:@"mp4" subdirectory:nil];        /**     *  初始化 movie     */    _movie = [[GPUImageMovie alloc] initWithURL:sampleURL];        /**     *  是否重复播放     */    _movie.shouldRepeat = NO;        /**     *  控制GPUImageView预览视频时的速度是否要保持真实的速度。     *  如果设为NO，则会将视频的所有帧无间隔渲染，导致速度非常快。     *  设为YES，则会根据视频本身时长计算出每帧的时间间隔，然后每渲染一帧，就sleep一个时间间隔，从而达到正常的播放速度。     */    _movie.playAtActualSpeed = YES;        /**     *  设置代理 GPUImageMovieDelegate，只有一个方法 didCompletePlayingMovie     */    _movie.delegate = self;        /**     *  This enables the benchmarking mode, which logs out instantaneous and average frame times to the console     *     *  这使当前视频处于基准测试的模式，记录并输出瞬时和平均帧时间到控制台     *     *  每隔一段时间打印： Current frame time : 51.256001 ms，直到播放或加滤镜等操作完毕     */    _movie.runBenchmark = YES;        /**     *  添加卡通滤镜     */    _filter = [[GPUImageToonFilter alloc] init];    [_movie addTarget:_filter];        /**     *  添加显示视图     */        [_filter addTarget:self.filterView];        [self.view addSubview:_filterView];        /**     *  视频处理后输出到 GPUImageView 预览时不支持播放声音，需要自行添加声音播放功能     *     *  开始处理并播放...     */    [_movie startProcessing]; }/** 切换滤镜效果,切换频繁会有卡顿，可异步 @param index index */- (void)switchCameraFilter:(NSInteger)index {    [_movie removeAllTargets];    switch (index) {        case 0:            _filter = [[GPUImageBilateralFilter alloc] init];            break;        case 1:            _filter = [[GPUImageHueFilter alloc] init];            break;        case 2:            _filter = [[GPUImageColorInvertFilter alloc] init];            break;        case 3:            _filter = [[GPUImageSepiaFilter alloc] init];            break;        case 4: {            _filter = [[GPUImageGaussianBlurPositionFilter alloc] init];            [(GPUImageGaussianBlurPositionFilter*)_filter setBlurRadius:40.0/320.0];        }            break;        case 5:            _filter = [[GPUImageMedianFilter alloc] init];            break;        case 6:            _filter = [[GPUImageVignetteFilter alloc] init];            break;        case 7:            _filter = [[GPUImageKuwaharaRadius3Filter alloc] init];            break;        default:            _filter = [[GPUImageBilateralFilter alloc] init];            break;    }    [_movie addTarget:_filter];    if (self.filterView != nil) {        [self.filterView removeFromSuperview];    }    [_filter addTarget:self.filterView];    [self.view addSubview:self.filterView];}

2、给本地视频添加滤镜，然后保存有滤镜效果的视频到本地

/** 不播放视频，视频添加滤镜直接保存本地 */- (void)saveVideo {    NSURL *sampleURL = [[NSBundle mainBundle]URLForResource:@"demo" withExtension:@"mp4" subdirectory:nil];        // 初始化 movie    _movie = [[GPUImageMovie alloc] initWithURL:sampleURL];    _movie.shouldRepeat = NO;    _movie.playAtActualSpeed = YES;        // 设置加滤镜视频保存路径    NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.mp4"];    unlink([pathToMovie UTF8String]);    NSURL *movieURL       = [NSURL fileURLWithPath:pathToMovie];        // 初始化    _writer = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(480, 640)];    _writer.encodingLiveVideo = NO;    _writer.shouldPassthroughAudio = NO;        /**     如果你设置了 _movie.audioEncodingTarget = _writer;     会报如下错误：     *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[AVAssetWriterInput appendSampleBuffer:] Cannot append sample buffer: Input buffer must be in an uncompressed format when outputSettings is not nil'     暂时没去深究，以后再解决！     */        // 添加滤镜    GPUImageToonFilter *filter = [[GPUImageToonFilter alloc] init];    [_movie addTarget:filter];    [filter addTarget:_writer];        [_movie enableSynchronizedEncodingUsingMovieWriter:_writer];    [_writer startRecording];    [_movie startProcessing];        __weak typeof(self) weakSelf = self;        [_writer setCompletionBlock:^{        NSLog(@"OK");                [filter removeTarget:weakSelf.writer];        [weakSelf.writer finishRecording];    }];

demo：http://github.com/chjwrr/LocalVideoAddFilter