Sunset Lake Software - Comments for "Extracting frames from the stream"

Aha! That's fantastic, it

Aha! That's fantastic, it works a treat.

Thank you

Marcus

There's no need to subclass.

There's no need to subclass. Simply set the newFrameAvailableBlock to a block that you'd like to run on every new processed frame.

I started off inheriting from

I started off inheriting from GPUImageFilter but GPUImageRawDataOutput makes a lot more sense.

Am I right to think that I create a new class that inherits from GPUImageRawDataOutput and then overrides newFrameReadyAtTime as below, so that when this is called I have a new frame to fun some processing on (some opencv processing in my case).

Thanks

- (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;
{

NSLog(@"newFrameReady");
[super newFrameReadyAtTime:frameTime atIndex:textureIndex];

// my code here

}

How do you want to extract

How do you want to extract them? There are several ways to do this.

For grabbing UIImages, you can use the -imageFromCurrentlyProcessedOutput method on any filter. However, this is fairly slow because of the need to convert to a UIImage.

There's also the GPUImageRawDataOutput, which has callbacks that allow you to access the raw bytes in the filter chain at that point.