On Wed, Feb 23, 2011 at 3:21 PM, Ken Thomases <k...@codeweavers.com> wrote: > On Feb 23, 2011, at 4:40 PM, Kyle Sluder wrote: > >> On Wed, Feb 23, 2011 at 2:17 PM, eveningnick eveningnick >> <eveningn...@gmail.com> wrote: >>> i am trying to write a video grabber, CGWindow API seems pretty convenient >>> (because it allows to select which window to "grab"), but i am worried about >>> the speed, because i need to record the grabbed frames to the video file. >> >> http://developer.apple.com/library/mac/#samplecode/OpenGLScreenCapture/Introduction/Intro.html%23//apple_ref/doc/uid/DTS10004445-Intro-DontLinkElementID_2 > > Actually, I don't think that's an improvement over the CGWindow API that > eveningnick was already using (CGWindowListCreateImage, I assume). In > general, if a high-level (more abstract) API achieves the desired result, it > will be at least as efficient as the low-level API -- because, if the > low-level approach is faster, the high-level API would just use it.
Except the high-level APIs are geared around taking a static screenshot. Remember, the OP is trying to capture a video. The method in the sample project creates multiple pixel buffers and asynchronously swaps the framebuffer contents into them. By design, the synchronous screen capture APIs cannot be as fast as working at this level. --Kyle Sluder _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
