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<TITLE>sane-devel: xscanimage crashes when using >1 V4L device</TITLE>
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<META NAME="Author" CONTENT="Jeffrey H. Ingber (jhingber@ix.netcom.com)">
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<META NAME="Subject" CONTENT="xscanimage crashes when using >1 V4L device">
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<H1>xscanimage crashes when using >1 V4L device</H1>
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<!-- received="Sun Jan 21 01:16:14 2001" -->
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<!-- sent="Sun, 21 Jan 2001 04:13:23 -0500" -->
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<!-- isosent="20010121091323" -->
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<!-- name="Jeffrey H. Ingber" -->
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<!-- subject="xscanimage crashes when using >1 V4L device" -->
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<!-- id="3A6AA833.2060706@ix.netcom.com" -->
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<STRONG>From:</STRONG> Jeffrey H. Ingber (<A HREF="mailto:jhingber@ix.netcom.com?Subject=Re:%20xscanimage%20crashes%20when%20using%20>1%20V4L%20device&In-Reply-To=<3A6AA833.2060706@ix.netcom.com>"><EM>jhingber@ix.netcom.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Jan 21 2001 - 01:13:23 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0219.html">Henning Meier-Geinitz: "Re: please advise: Mustek 12000SP, NCR810 & color stripes"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0217.html">FJA van Zijp: "please advise: Mustek 12000SP, NCR810 & color stripes"</A>
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<P>
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Hi,
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<BR>
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<P> I posted this problem a month or so ago, but didn't have to time to
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<BR>
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investigate until today. A system with more than one V4L device will
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<BR>
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cause xscanimage to crash when using the V4L backend.
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<BR>
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<P>Example:
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<BR>
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<P>I have an Creative Labs WebCam III (USB) using the OV511 kernel driver
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<BR>
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(/dev/video0) and a Matrox Rainbow Runner-G series capture card
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<BR>
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(/dev/video1) using the marvel-linux drivers. When trying to aquire a
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<BR>
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frame from either device using xscanimage from within GIMP, the plugin
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<BR>
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will die with GIMP's standard error message "The plugin has died, etc.".
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<BR>
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<P>I think I may have found the cause of this:
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<BR>
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<P>"scanimage -L" reveals:
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<BR>
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<P>device `v4l:/dev/video1' is a V4L mgacap-0 virtual device
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<BR>
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device `v4l:/dev/video0' is a V4L mgacap-0 virtual device
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<BR>
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device `hp:/dev/sg5' is a Hewlett-Packard C7670A flatbed scanner
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<BR>
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device `hp:/dev/scanner' is a Hewlett-Packard C7670A flatbed scanner
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<BR>
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<P>As you can see, SANE can't differentiate between the two V4L devices.
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<BR>
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It is identifying the webcam and Matrox card as the same device.
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<BR>
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/dev/video0 should be the webcam, and /dev/video1 should be the Matrox
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<BR>
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card. I think this is what's causing the crash. When one one device
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<BR>
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device has it's drivers loaded, the plugin works, but not when both
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<BR>
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devices are loaded.
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<BR>
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<P>Is this operator headspace or might this be a problem with the backend
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<BR>
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itself? Any input would be appreciated.
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<BR>
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<P>Thanks,
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<BR>
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Jeffrey H. Ingber (<A HREF="mailto:jhingber@ix.netcom.com?Subject=Re:%20xscanimage%20crashes%20when%20using%20>1%20V4L%20device&In-Reply-To=<3A6AA833.2060706@ix.netcom.com>">jhingber@ix.netcom.com</A>)
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<BR>
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<P><P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20xscanimage%20crashes%20when%20using%20>1%20V4L%20device&In-Reply-To=<3A6AA833.2060706@ix.netcom.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0219.html">Henning Meier-Geinitz: "Re: please advise: Mustek 12000SP, NCR810 & color stripes"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0217.html">FJA van Zijp: "please advise: Mustek 12000SP, NCR810 & color stripes"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Jan 21 2001 - 01:18:38 PST</EM>
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