Le 14 janv. 2010 à 20:11, Travis Kirton a écrit : > Hi, > > We're working with Core Video to play back videos @ 1024 x 768 resolution. > The videos are stacked on top of one another and revealed as a user draws > over top of them. To achieve this "drawing into" the stack of videos, we're > filtering using CIImage to create alpha masks over top of an individual video. > > Playback is very choppy, and we haven't been able to determine if it's the > compression we're using (i.e. the video assets themselves) or anything to do > with the combination of Core Video, Core Image & the 1024x768 format. > > Some problems we're facing is that even if we're only using 2 videos and not > doing any filtering, the videos lag. > > We initially we compressed our original files out, so that the overall file > size is much smaller. Even still, with 2 movies @ approx. 50MB each we're > having problems. > > Using TOP, from terminal, to overall system usage we're getting results that > the system is chewing up to 180% cpu. > > We'd be really greatful for any help on whether this is an asset, a code, or > a compression issue (or all three). > > Cheers,
Ask Instruments, it is the only one able to tell you what's going on. The simplest way to do this is to use the Xcode Menu Run > Run with Performance Tool > Time Profiler. -- Jean-Daniel _______________________________________________ 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
