GPUImage-本地视频添加滤镜无声音问题

- (void)saveVideo {

NSURL *sampleURL =[NSURL fileURLWithPath: [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/1512121874.mp4"]];//视频文件



// 初始化 movie

_imageMovie = [[GPUImageMovie alloc] initWithURL:sampleURL];

_imageMovie.shouldRepeat = NO;

_imageMovie.playAtActualSpeed = YES;

// 设置加滤镜视频保存路径

NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.mp4"];//输出文件

unlink([pathToMovie UTF8String]);

NSURL *movieURL      = [NSURL fileURLWithPath:pathToMovie];

// 初始化

_movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(960,544)];

_movieWriter.encodingLiveVideo = NO;

_movieWriter.shouldPassthroughAudio = YES;//是否使用源音源

_imageMovie.audioEncodingTarget = _movieWriter;//加入声音

// 添加滤镜

GPUImageToonFilter *filter = [[GPUImageToonFilter alloc] init];

[_imageMovie addTarget:filter];

[filter addTarget:_movieWriter];

[_imageMovie enableSynchronizedEncodingUsingMovieWriter:_movieWriter];

[_movieWriter startRecording];

[_imageMovie startProcessing];

__weak typeof(self) weakSelf = self;

[_movieWriter setCompletionBlock:^{

NSLog(@"合并完成");

[filter removeTarget:weakSelf.movieWriter];

[weakSelf.movieWriter finishRecording];

}];

[_movieWriter setFailureBlock:^(NSError *error) {

NSLog(@"合成失败 173：error = %@",error.description);

}];

搞了很久终于发现加入滤镜没有声音是什么问题

_movieWriter.shouldPassthroughAudio = YES;//是否使用源音源

_imageMovie.audioEncodingTarget = _movieWriter;//加入声音

但我发现合成好慢，有没有朋友发现用什么方式会合成得快一些