本文內(nèi)容：
1、播放本地視頻暮的，實時添加濾鏡笙以，修改不同的濾鏡效果
2、給本地視頻添加濾鏡冻辩，然后保存有濾鏡效果的視頻到本地
1猖腕、播放本地視頻，實時添加濾鏡恨闪，修改不同的濾鏡效果
/**
播放視頻倘感，實時添加濾鏡
*/
- (void)playVideo{
NSURL *sampleURL = [[NSBundle mainBundle]URLForResource:@"demo" withExtension:@"mp4" subdirectory:nil];
/**
* 初始化 movie
*/
_movie = [[GPUImageMovie alloc] initWithURL:sampleURL];
/**
* 是否重復(fù)播放
*/
_movie.shouldRepeat = NO;
/**
* 控制GPUImageView預(yù)覽視頻時的速度是否要保持真實的速度。
* 如果設(shè)為NO咙咽，則會將視頻的所有幀無間隔渲染老玛，導(dǎo)致速度非常快钧敞。
* 設(shè)為YES蜡豹，則會根據(jù)視頻本身時長計算出每幀的時間間隔，然后每渲染一幀溉苛，就sleep一個時間間隔镜廉，從而達(dá)到正常的播放速度。
*/
_movie.playAtActualSpeed = YES;
/**
* 設(shè)置代理 GPUImageMovieDelegate愚战，只有一個方法 didCompletePlayingMovie
*/
_movie.delegate = self;
/**
* This enables the benchmarking mode, which logs out instantaneous and average frame times to the console
*
* 這使當(dāng)前視頻處于基準(zhǔn)測試的模式桨吊，記錄并輸出瞬時和平均幀時間到控制臺
*
* 每隔一段時間打油： Current frame time : 51.256001 ms，直到播放或加濾鏡等操作完畢
*/
_movie.runBenchmark = YES;
/**
* 添加卡通濾鏡
*/
_filter = [[GPUImageToonFilter alloc] init];
[_movie addTarget:_filter];
/**
* 添加顯示視圖
*/
[_filter addTarget:self.filterView];
[self.view addSubview:_filterView];
/**
* 視頻處理后輸出到 GPUImageView 預(yù)覽時不支持播放聲音视乐，需要自行添加聲音播放功能
*
* 開始處理并播放...
*/
[_movie startProcessing];
}
/**
切換濾鏡效果,切換頻繁會有卡頓，可異步
@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敢茁、給本地視頻添加濾鏡佑淀，然后保存有濾鏡效果的視頻到本地
/**
不播放視頻，視頻添加濾鏡直接保存本地
*/
- (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;
// 設(shè)置加濾鏡視頻保存路徑
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;
/**
如果你設(shè)置了 _movie.audioEncodingTarget = _writer;
會報如下錯誤：
*** 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'
暫時沒去深究彰檬，以后再解決伸刃！
*/
// 添加濾鏡
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];
}];
