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From: Rath <mailings@hardware-datenbank.de>
To: Linux-Media <linux-media@vger.kernel.org>
Subject: cpu load of webcam read out with omap3/beagleboard
Date: Sun, 18 Oct 2009 12:43:55 +0200	[thread overview]
Message-ID: <4ADAF16B.1090409@hardware-datenbank.de> (raw)

Hi,

I have beagleboard with the OMAP3530 processor and I want to read a usb 
webcam out. But I only get usable results at 160x120 resolution.
I set the pixelformat to "V4L2_PIX_FMT_RGB24" and the resolution to 
160x120. With these settings I get 30fps at 4% cpu load. But when I set 
the resolution to 320x240 or 640x480 the cpu load is at 98% and I get 
only 17 or 4fps. Also I get at 640x480 errors like "libv4lconvert: Error 
decompressing JPEG: fill_nbits error: need 9 more bits".

Is this a normal behavior or is  there a way to fix  this?  I think the 
problem is the conversion from MJPEG to RGB, because when I set the 
pixelformat to MJPEG the cpu load is <1%.  But  I need RGB data for 
image processing.

I hope someone can help me.

Regards, Joern

             reply	other threads:[~2009-10-18 10:43 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-10-18 10:43 Rath [this message]
2009-10-23 14:28 ` cpu load of webcam read out with omap3/beagleboard rath
2009-10-26 10:02   ` Hiremath, Vaibhav

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