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
>
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