Re: Opening camera with specific format/mode?

Subject: Re: Opening camera with specific format/mode?

From: Sean Williams <email@hidden>

Date: Tue, 25 Oct 2005 15:26:38 -0500

Delivered-to: email@hidden

On Oct 25, 2005, at 12:52 PM, Alex Majora wrote:

On October 25, 2005 at 7:17 AM Sean Williams wrote:

(to get the camera's 4:1:1 format select "Component Video - CCIR-601 uyvy" in the SGSettingsDialog())

When I bring up the settings dialog, a "Component Video" compression is listed in the pulldown menu, but nothing more specific.

Hmmm...that would either mean you are running on a G3 (where I ignore a camera's YUV 4:1:1 modes) or you are seeing a bug I only recently fixed (and as normal, can't elaborate on about potential release dates for the fix).

I had naively expected only a single color encoding to be used for each mode, so if I saw one that was unsupported (i.e, Mono 16) I would also ignore the color encodings I did support.

And, it gives me the same monochrome image as if I had used "None".

Though not really related to the issue at hand, it is useful to remember that the SequenceGrabber only instructs a digitizer to switch to a non-preferred compression type during record operations. So the preview won't generally change in that dialog when one changes the compression type since the SG is operating in preview mode.

At any rate, is there no programmatic way to do this? If the QuickTimeIIDCDigitizer.component doesn't have an API for setting a camera's format/mode, how can I go about doing this? I'm in a Cocoa / 10.4.2 environment.

Barring the bug mentioned above, if one does not want to use the SGSettingsDialog to configure the video channel

A) Figure out what compression types the video channel natively supports (and for the QuickTimeIIDCDigitizer, this might vary based on which input is active)

VDGetCompressionTypes()

B) If it has one that you want (in your case, the 4:1:1 internal format upscaled to 4:2:2 would be k422YpCbCr8CodecType) tell SG to use that compressor type with the channel:

SGSetVideoCompressorType()

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References:
	>Re: Opening camera with specific format/mode? (From: "Alex Majora" <email@hidden>)