3 As an application, we can ask the Window Server to send us the screen contents as they're displayed via the CGDisplayStream APIs. The Window Server is the process in macOS responsible for keeping track of windows and their contents and for compositing them together to make the image you see on your display. Screen Capture in macOS inevitably starts with the Window Server. If not, that's fine, there's no reason to know this stuff anyway. If you're interested in the inner workings of RetroClip, read on because this section is for you. The more efficient RetroClip can be, the more is left over for doing important things, and for saving battery life. It's not just for bragging rights, though, the idea is to be able to leave RetroClip running all the time, even while playing games, watching videos, compiling code, writing blog posts, and so on. It actually only took me a few hours to get an initial version of the app up and running, but eking out the maximum performance became something of an obsession. I've been code golfing RetroClip in my spare time for the past couple of months. Technical Notes: The Secrets of RetroClip Please let us know what you think, either by email or on Twitter. Even if you don't use it for games, you may find it useful for capturing those pesky bug reports where you can't seem to reproduce it a second time.
2 Once you see something you want to save, just press the RetroClip keyboard shortcut, and RetroClip writes the memory region with the video data out to disk, essentially instantaneously.Īnyway, you should download it and give it a try.
We can fit 30 seconds of HD video in around 40MB of memory. The neat thing is, we don't even need that much memory to do a good job. Instead, it saves video frames to a fixed size circular buffer in main memory. Unlike other screen capture utilities for macOS, RetroClip does not save to an ever growing scratch file on disk as it is recording. The key idea is that you don't know when you want to save a video clip until after something exciting has happened, so it needs to work retroactively - it's no good if you have to press a button to start the recording because it's already too late. 1 Current generation video game consoles all have a feature where you can press a button and capture the last minute or so of gameplay and I wanted this for my Mac. I got the idea to write RetroClip after playing the game Fortnite Battle Royale and winning, and then having nothing to show for it besides a static screenshot. There is a browser based demo you can try if you're on a Mac or a PC (and you really should try it because it's super cool). It's called RetroClip, and it makes taking instant replay video captures of your Mac's screen as easy as taking a screenshot. We have a new app out on the Mac App Store.
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