iOS 合并带有透明通道的视频-

标签：ios开发

视频的合成，透明通道是大家所熟知的

    _movieFile.runBenchmark = YES;
    _movieFile.playAtActualSpeed = NO;
    _movieFile2 = [[GPUImageMovie alloc] initWithURL:url2];
    _movieFile2.runBenchmark = YES;
    _movieFile2.playAtActualSpeed = NO;
    _filter = [[GPUImageScreenBlendFilter alloc] init];
    //    filter = [[GPUImageUnsharpMaskFilter alloc] init];
    [_movieFile addTarget:self.filter];
    [_movieFile2 addTarget:self.filter];
    // Only rotate the video for display, leave orientation the same for recording
    // In addition to displaying to the screen, write out a processed version of the movie to disk
    NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/last.mov"];
    unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
    
    NSLog(@"file = %@",pathToMovie);
    NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];
    
    self.movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(640.0, 360.0)];
    [self.filter addTarget:self.movieWriter];
    // Configure this for video from the movie file, where we want to preserve all video frames and audio samples
    self.movieWriter.shouldPassthroughAudio = YES;
    //movieFile.audioEncodingTarget = self.movieWriter;
    [_movieFile enableSynchronizedEncodingUsingMovieWriter:self.movieWriter];
    
    [self.movieWriter startRecording];
    [_movieFile startProcessing];
    [_movieFile2 startProcessing];
    __block mlkiMovie * sself = self;
    
    [self.movieWriter setCompletionBlock:^{
        [sself.filter removeTarget:sself.movieWriter];
        [sself.movieFile endProcessing];
        [sself.movieFile2 endProcessing];
        [sself.movieWriter finishRecording];
        NSLog(@"ok");
    }];

iOS 合并带有透明通道的视频-

标签：ios开发

原文地址：http://blog.csdn.net/think_ma/article/details/43513427