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Sggoodri
December 16, 2003, 21:26:31
Is there any way to capture video at slower than 15 fps with the DFK 31F03?

We are evaluating an ImagingSource DFK 31F03 firewire camera for our application. The IC Capture program lists only one frame rate, 15.2 frames per second, for selection.

When using DirectShow applications such as AMCap and GraphEdit, the capture output pin properties list only one frame rate, 15 fps.

If we set the frame rate to anything else programatically via IAMStreamConfig, the video becomes corrupted.

Our application requires only 5 frames per second; is there no way to specify this slower rate for the DFK 31F03 camera to save bandwidth and disk space? We will not be able to use this camera otherwise.

Thank you,
Steve Goodridge
Raleigh, NC

Johannes Vogel
December 17, 2003, 17:28:54
Hello,

Currently, the camer only provides 15fps. Future versions of the camera will provide slower framrates. Unfortunately I have no date when this will be available.

If you are writing the video stream to an AVI file, there is no way to reduce the disk space needed for the video data. If you are processing and storing individual frames using the ring buffer, you can skip buffers in the ring buffer.

Sggoodri
December 17, 2003, 19:09:11
Thanks for your reply. Do any of the firewire cameras allow the user to specify a specific, slower-than-maximum frame rate?

Is future control of capture rate merely a driver upgrade that may be applied to an existing camera, or will it require different camera hardware?

We would prefer to use an out-of-the-box Directshow capture driver rather than writing our own with our own buffer management.

Steve Goodridge

Stefan Geissler
December 18, 2003, 08:53:10
Steve,

For example the DxK 21F04 cameras have specific frames rates: 3.75, 7.5, 15, 30
Please refer to http://www.1394imaging.com/products/cameras/dfk21f04/docs/specs.htm
for the specifications of these camera types.

Also the Sony DCams can use specific frame rates. Please see
http://www.1394imaging.com/products/cameras/dfwx700/docs/dfwx700_ds.en.pdf
and
http://www.1394imaging.com/products/cameras/dfwx700/

Johannes Vogel
December 19, 2003, 19:03:08
Hello,

Slower frame rates will require a new firmware revision of the DFK 31F03 camera.