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];
}];
