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copied!<p>Movies can be loaded into the framework via the GPUImageMovie class, filtered, and then written out using a GPUImageMovieWriter. GPUImageMovieWriter is also fast enough to record video in realtime from an iPhone 4's camera at 640x480, so a direct filtered video source can be fed into it.</p> <p>The following is an example of how you would load a sample movie, pass it through a pixellation and rotation filter, then record the result to disk as a 480 x 640 h.264 movie:</p> <pre><code>movieFile = [[GPUImageMovie alloc] initWithURL:sampleURL]; pixellateFilter = [[GPUImagePixellateFilter alloc] init]; GPUImageRotationFilter *rotationFilter = [[GPUImageRotationFilter alloc] initWithRotation:kGPUImageRotateRight]; [movieFile addTarget:rotationFilter]; [rotationFilter addTarget:pixellateFilter]; NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"]; unlink([pathToMovie UTF8String]); NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie]; movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(480.0, 640.0)]; [pixellateFilter addTarget:movieWriter]; [movieWriter startRecording]; [movieFile startProcessing]; </code></pre> <p>Once recording is finished, you need to remove the movie recorder from the filter chain and close off the recording using code like the following:</p> <pre><code>[pixellateFilter removeTarget:movieWriter]; [movieWriter finishRecording]; </code></pre> <p>A movie won't be usable until it has been finished off, so if this is interrupted before this point, the recording will be lost.</p> <p>Here is good tutorial:</p> <p><a href="http://www.sunsetlakesoftware.com/2012/02/12/introducing-gpuimage-framework" rel="nofollow">http://www.sunsetlakesoftware.com/2012/02/12/introducing-gpuimage-framework</a></p> <p>See "Filtering and re-encoding a movie" section.</p>

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