Question

我想在现有的已捕获视频中添加过滤效果，我尝试使用GPUImageMovie(<GPUImage/GPUImage.h>)进行此操作，但在[movieWriter startRecording];上遇到崩溃所以如果有其他任何正确方法，请您建议我这样做。

提前致谢。

Answer 1

只需传递现有的videoURL即可过滤，不要忘记添加GPUImage Framework。

- (void)testFilterOptions:(NSURL*)videoUrl{

    movieFile = [[GPUImageMovie alloc] initWithURL:videoUrl];
    movieFile.runBenchmark = YES;
    movieFile.playAtActualSpeed = NO;
    //filter = [[GPUImagePixellateFilter alloc] init];
    filter = [[GPUImageSepiaFilter alloc] init];

    [movieFile addTarget:filter];

    // Only rotate the video for display, leave orientation the same for recording
//    GPUImageView *filterView = (GPUImageView *)self.previewView;
//    [filter addTarget:filterView];

    // In addition to displaying to the screen, write out a processed version of the movie to disk
    NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.mov"];
    unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
    NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

    movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(480.0, 480.0)];
    [filter addTarget:movieWriter];

    // Configure this for video from the movie file, where we want to preserve all video frames and audio samples
    movieWriter.shouldPassthroughAudio = NO;
    movieFile.audioEncodingTarget = nil;
    [movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];

    [movieWriter startRecording];
    [movieFile startProcessing];

    [movieWriter setCompletionBlock:^{
        [filter removeTarget:movieWriter];
        [movieWriter finishRecording];

        dispatch_async(dispatch_get_main_queue(), ^{
      //Recording complete do whatever you want
        });
    }];
}

如何在现有视频中添加过滤器？

1 个答案: