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Re: Passing file LUN to C routine [message #35118 is a reply to message #35065]

Mon, 12 May 2003 08:25

Stein Vidar Hagfors H[2] is currently offline

Stein Vidar Hagfors H[2]
Messages: 28
Registered: October 2002

Junior Member

Ben Tupper <btupper@bigelow.org> writes:

[..]
> (1) pass C the LUN and have the C write each frame: best rate about 15
> frames per second (fps)
>
> (2) pass C a predefined array into which it stores the latest frame
> and return to IDL, then have IDL store the frame: best rate about 15
> fps
>
> No difference!
>
> Each of these are performed in a event driven loop where the events
> are simple timer events with TIMER = verySmallValue. I think I'll try
> it in just a simple loop for fun.
>
>
> Ultimately, I would like to access the video at full frame rate (30
> fps) - not that I need all the frames, but rather I can be sure I am
> getting the every Nth frame. I seem to have other problems right now;
> if I have C grab N frames as fast as it can without sending each frame
> back to IDL
> then I see frame rates as high as 22.5 fps. Hmmm. The promotional
> stuff that came with the frame grabber says I can get full frame rate.
> Dang.

With your problem above (22.5 fps max), are you still writing to disk?
Uncompressed, full-framerate video to disk is quite a challenge for a
number of hardware configurations...

--
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Stein Vidar Hagfors Haugan
ESA SOHO SOC/European Space Agency Science Operations Coordinator for SOHO

NASA Goddard Space Flight Center, Tel.: 1-301-286-9028
Mail Code 682.3, Bld. 26, Room G-1, Cell: 1-240-354-6066
Greenbelt, Maryland 20771, USA. Fax: 1-301-286-0264
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[Message index]

		Passing file LUN to C routine By: btt on Tue, 06 May 2003 11:22
		Re: Passing file LUN to C routine By: btt on Wed, 07 May 2003 06:54
		Re: Passing file LUN to C routine By: Stein Vidar Hagfors H[2] on Mon, 12 May 2003 08:25
		Re: Passing file LUN to C routine By: Nigel Wade on Wed, 07 May 2003 02:56
		Re: Passing file LUN to C routine By: btt on Mon, 12 May 2003 09:33
		Re: Passing file LUN to C routine By: Stein Vidar Hagfors H[2] on Fri, 16 May 2003 10:45
		Re: Passing file LUN to C routine By: btt on Mon, 19 May 2003 05:33

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