Hz od FPS? On Nov 30, 2011, at 2:27 PM, jesse wrote:
> (Apologies if this is the wrong list, searching around it seems like this is > the list where AVFoundation is most discussed - please point me to the right > list if I'm in the wrong one!) > > Hello List, > > I'm hoping to grab from a webcam at greater than 30hz. I purchased a Philips > SPZ6500/27 for this purpose, which claims to support up to 90hz grabbing. It > also claims to be a UVC camera. My initial thought is to use AVFoundation > Capture, because it looks like the way to go for new development, and looks > like it supports directly access/setting hardware specific parameters like > frame rate. I've tried AVRecorder to make sure that the camera works with > AVFoundation, and everything works well running the example code and viewing > the camera output. However, when I added code to enumerate the formats > ("AVCaptureDevice::formats"), nothing over 30hz shows up in the list. > > I'm hoping the collective wisdom of the list can help with some basic > questions, before I go too far down a wrong path: > -Is it possible to grab at greater than 30hz with AVFoundation, or is that a > maximum frame rate that's part of the spec? > -If I feel a format exists that isn't listed in the > "AVCaptureDevice::formats", is there any chance of success manually defining > that format and trying to get the AVCaptureDevice to accept it (or similarly, > perhaps it is possible to manually inform AVFoundation of the camera > capabilities earlier in the process)? > > -Other options: > - If this particular camera isn't well behaved, are there any > known-compatible cameras that can capture faster than 30hz? > - Is there another API to look at in this case to get the camera data at > higher frame rates? > > Thanks for any tips!! > Jesse > > _______________________________________________ > > 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/zav%40mac.com > > This email sent to z...@mac.com _______________________________________________ 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