iOS GPUImage之GPUImageMovie视频滤镜（2）

示例：使用 GPUImageMovie 为视频添加滤镜，并保存文件（简单使用）

//
//  ViewController.m
//  GPUImageTest2
//
//  Created by 黄健 on 16/7/2.
//  Copyright © 2016年 黄健. All rights reserved.
//

#import "ViewController.h"

#import "GPUImage.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet GPUImageView *gpuImageView;
@property (nonatomic,strong) GPUImageMovie *movie;
@property (nonatomic,strong) GPUImageMovieWriter *writer;

@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];

// 视频路径（同上一篇 GPUImageMovieWriter 文章）
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];
}];

}

@end