Quartz crystal is not a plugin so I cannot use it in my xcode application, but the processing it is doing on each frame can be done inside the xcode application as I am using core video's display link to fetch a frame from composition (QCRenderer's renderAtTime). CoreVideo's display link syncs with the monitor's refresh rate which is 60Hz and renders smoothly on the desktop but at 25fps the result is choppy on Decklink as well. The hops are not an issue on the desktop but it is on the Decklink SDI output. I would like to know what quartz crystal does to each frame inside the code so that I can do that to my composition frames too before sending it to SDI card's memory. Dear Achim, I can understand the fps issue you are taking about but in my application I have used displaylink which can be set to callback a function at 25fps as well and inside that callback we can fetch next frame by using QCRendere's renderAtTime function. Also hops are not an issue on computer's monitor, the requirement is a smooth playback through the video card not the GPU which is Decklink in my case. Subject: Re: exporting a composition to a quicktime movie From: dokt...@mac.com Date: Fri, 24 Dec 2010 16:18:01 -0500 CC: quartzcomposer-dev@lists.apple.com To: nisar...@hotmail.com
It might be helpful to describe why the movie is poor. What is the expected result, what do you actually see, etc. If the issue is flickering text, then yes, Quartz Composer renders at 60fps, DV @ 25 will make the title crawl look choppy since there are less frames to show the text crawl between two positions. Doing smooth titles is not easy at high speed, low framerate, there are some tricks you can do, but the best thing is to adjust the speed of the scrolling until it looks good. Maybe look into Quartz Crystal from Kineme and use frame blending which will help ease the "pops" in position between consecutive frames. Is that the issue you are noticing? On Dec 24, 2010, at 7:41 AM, Nisar Ahmed wrote:I am trying to export a quartz composition movie to a quicktime movie using quicktime pro but the result is poor as compared to the original composition file. I am attaching the composition you can try opening it with quicktime pro and exporting it to dv-pal movie 25fps and see the result. I have also tried other combinations but failed to reproduce the expected result. Thanks in advanceNisar<crawler.qtz> _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/doktorp%40mac.com This email sent to dokt...@mac.com
_______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
