Unfortunately, joining the images together into a movie is the hard part. Unless you want to roll your own encoder, you will need to use a library like ffmpeg.

-Matt

I have no problem with making images from presentation layer. The only thing I have to do, is to join this images to make movie.

Not in the same way. This sample code uses QTKit on OSX. QTKit is not available on the phone currently. You could probably grab the individual images with -renderInContext on the layer and insert that into a movie using ffmpeg. Of course, I’ve not worked with ffmpeg, so this is speculation, however, I know people have successfully implemented ffmpeg code on the phone.

Best Regards.

Is there any way to record movies in iphone OS, as it is in MAC OS ?

You can try it very easily for yourself and see. Create a new Cocoa application from Xcode. Create a class to act as you application delegate and set it up in IB.

In AppDelegate.h:

import

import

@interface AppDelegate : NSObject { CVDisplayLinkRef displayLink; }

@end

In AppDelegate.m

import “AppDelegate.h”

CVReturn MyDisplayLinkCallback( CVDisplayLinkRef displayLink, const CVTimeStamp *inNow, const CVTimeStamp *inOutputTime, CVOptionFlags flagsIn, CVOptionFlags *flagsOut, void *displayLinkContext ) { fprintf(stderr, “In MyDisplayLinkCallback\n”); // draw/get your Core Animation frame here return kCVReturnSuccess; } @implementation AppDelegate

• (void) applicationDidFinishLaunching:(NSNotification*)the_notification { NSLog(@”applicationDidFinishLaunching”); CVDisplayLinkCreateWithActiveCGDisplays(&displayLink); CVDisplayLinkSetOutputCallback(displayLink, &MyDisplayLinkCallback, self); CVDisplayLinkStart(displayLink); }

@end

The function MyDisplayLinkCallback will be called back in sync with the refresh rate of your display. This is the perfect time to draw.

Keep in mind that Core Video callbacks operate on a secondary thread, so you may need to lock. But maybe because you are drawing in a new context you create, you might not need to lock anything.

Can you be a bit more specific? Which callbacks? I can do a screen grab session using OpenGL, but the point of the post was that you can record your Core Animation without having to set up OpenGL or some other mechanism. While what you’re saying sounds right, it doesn’t sound easier.

Thanks.

-Matt

Another use would be to record your CA in HD resolutions and pipe it to your AppleTV or for use as a screensaver (if there’s a simple “play this QT as screensaver, screensaver”) with minimal CPU/GPU usage.