Comments on: ARM-wrestling with OpenCV

By: Igor Stepura

Igor Stepura — Wed, 24 Feb 2010 03:42:06 +0000

Lucas, it looks like your camera outputs video in its own weird format. You can check http://hansdegoede.livejournal.com/3636.html and http://forum.skype.com/index.php?showtopic=225971 on how people deal with that.

By: lucas azevedo

lucas azevedo — Fri, 19 Feb 2010 20:26:12 +0000

Igor, I am using the -with-v4l option in the configure parameters, and also I’ve managed to compile a patched 2.6.32.3 kernel with the modules:
gspca_pac207, gspca_main, v4l1-compat, v4l2-common, v4l2-int-device, videodev (it looks like the gspca_pac207 driver needs the v4l1-compat module).

But when I try to run that test application, a new error appears:

HIGHGUI ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV
Unable to stop the stream.: Bad file descriptor
HIGHGUI ERROR: V4L: Unable to determine size of incoming image
cvCapture failed

I am using the 1.1pre1 opencv version.

By: Igor Stepura

Igor Stepura — Thu, 04 Feb 2010 02:15:11 +0000

Lucas, if you’re going to use web-camera as video source for OpenCV you need to:
1) Make sure that your kernel has v4l2 support (check kernel config)
2) Enable v4l support in OpenCV (it’s disabled in my script). Add “–with-v4l” option to ./configure parameters

By: lucas azevedo

lucas azevedo — Thu, 04 Feb 2010 01:27:22 +0000

Hello Igor!
Thanks for the information, it’s been very useful.
I’m trying to setup opencv on a ts7250 board, to use it for some small processing and then streaming it to another program on my computer to make heavier processing on the video.
After a LOT of tweaking, I managed to compile the example code that I obtained in http://nashruddin.com/StrEAMinG_oPENcv_vIdEos_ovER_tHe_nEtWoRk as a first try, but I’m not displaying the video on the board (I’ve commented it out of stream_server.c code) because it does not have a video output. I’ve used a OABI compiler and the shared opencv libraries.
The problem is: cvCapture fails. So I thought “I guess it means that I need to compile the videodev driver, modprobe it, and then run the program again.”
Well, I did it, but still no success.
You have any pointers on what should I do now?

By: Igor Stepura

Igor Stepura — Mon, 30 Nov 2009 04:59:10 +0000

I reckon you’re using Cygwin host. Have you set CYGPATH variable before running the script? Section 2.6.1.2 “Working with Cygwin” of Sourcery G++ Lite “Getting Started” document.

By: Igor Stepura

Igor Stepura — Mon, 30 Nov 2009 04:43:54 +0000

Good catch! I checked with autoconf documentation and you’re right – the –host parameter specifies “the type of system on which the package runs”. So in my case it should be set to $APP_PREFIX and –build should be set to $GCC_HOST.

It didn’t cause errors with CodeSourcery toolchains, however, since they always compile for arm-linux and –host could be set to any value only to enable cross-compilation mode for “configure” script.

http://www.gnu.org/software/autoconf/manual/html_node/Specifying-Target-Triplets.html#Specifying-Target-Triplets

By: virgoptrex

virgoptrex — Thu, 19 Nov 2009 19:19:20 +0000

I am bit confused why most websites who have an article state argument to./configure attribute –host = arm-linux. while in your case you states –host=i686-pc-linux. Now is the host the real host (e.g. x86 based laptop on which we are compiling) or is it the target which hosts the compiled program – either after NFS mounted or other method (e.g. Gumstix, Davinci, Beagleboard) ?

By: Matthias

Matthias — Wed, 11 Nov 2009 12:17:59 +0000

Hi, this helped me, but brought me an other error:

cxcore/cxmatmul.cpp: in function ‘void cv::gemm(const cv::Mat&, const cv::Mat&, double, const cv::Mat6):
cxcore/cxmatmul.cpp:624: error: requested for member ‘data’ in ‘32′, which is of non-class type ‘int’
[...]

By: Hype

Hype — Wed, 11 Nov 2009 10:57:27 +0000

Hi there,

thanks for your great script. I get opencv 1.1pre1 configured in no time, but i’m having trouble compiling it.

When typing “make” I get the following errors:

cxerror.cpp:96: error: ‘pthread_key_t’ does not name a type
cxerror.cpp:424: error: ‘g_TlsIndex’ was not declared in this scope
cxerror.cpp:424: error: ‘phtread_key_create’ was not declared in this scope

Do you have any idea why this happens?

By: Matthias

Matthias — Wed, 11 Nov 2009 08:16:41 +0000

Hi there,

first of all thanks for your skript. It helped me to understand how to get going with compiling opencv for ARM. Nonetheless i’m stucking right at the beginning. I used your script and modified it to fit my needs.

Here it comes:

#!/bin/bash
### Windows (Cygwin) host.
export APP_PREFIX=arm-none-eabi
export DEVROOT=/cygdrive/c/_devtools/CodeSourcery/SourceryG++Lite
export CYGPATH=C:/Program\ Files/cygwin/bin/

./configure \
–target=$APP_PREFIX \
–host=$GCC_HOST \
–disable-shared \
–enable-static \
–without-imageio –without-carbon \
–without-quicktime –without-python \
–without-gtk –without-swig \
–without-v4l \
–disable-openmp \
–disable-apps \
–prefix=$DEVROOT/$APP_PREFIX \
CC=$DEVROOT/$APP_PREFIX/bin/gcc \
CXXFLAGS=”-fsigned-char $OFLAGS -pipe” \
LD=$DEVROOT/$APP_PREFIX/bin/ld \
CPP=$DEVROOT/$APP_PREFIX/bin/cpp \
CXXCPP=$DEVROOT/$APP_PREFIX/bin/cpp \
CXX=$DEVROOT/$APP_PREFIX/bin/g++ \
AR=$DEVROOT/$APP_PREFIX/bin/ar \
RANLIB=$DEVROOT/$APP_PREFIX/bin/ranlib \
NM=$DEVROOT/$APP_PREFIX/bin/nm \
STRIP=$DEVROOT/$APP_PREFIX/bin/strip \
AS=$DEVROOT/$APP_PREFIX/bin/as

When executing the script file opencv won’t configure correctly but end with an error:

configure: error: in /cygdrive/opencv
configure: error: C++ compiler cannot create executables.

The config.log shows:

configure:3079: $? = 0
configure:3086: /cygdrive/c/_devtools/CodeSourcery/SourceryG++Lite/arm-none-eabi/bin/g++ -v >&5
Using built-in specs.
Target: arm-none-eabi
Configured with: /scratch/maxim/arm-lite/src-4.3-arm-none-eabi-lite/gcc-4.3/configure –build=i686-pc-linux-gnu –host=i686-mingw32 –target=arm-none-eabi –enable-threads –disable-libmudflap –disable-libssp –disable-libstdcxx-pch –with-gnu-as –with-gnu-ld –enable-languages=c,c++ –disable-shared –with-newlib –with-pkgversion=’Sourcery G++ Lite 2009q1-161′ –with-bugurl=https://support.codesourcery.com/GNUToolchain/ –disable-nls –prefix=/opt/codesourcery –with-headers=yes –with-sysroot=/opt/codesourcery/arm-none-eabi –with-build-sysroot=/scratch/maxim/arm-lite/install-4.3-arm-none-eabi-lite/host-i686-mingw32/arm-none-eabi –with-libiconv-prefix=/scratch/maxim/arm-lite/obj-4.3-arm-none-eabi-lite/host-libs-2009q1-161-arm-none-eabi-i686-mingw32/usr –with-gmp=/scratch/maxim/arm-lite/obj-4.3-arm-none-eabi-lite/host-libs-2009q1-161-arm-none-eabi-i686-mingw32/usr –with-mpfr=/scratch/maxim/arm-lite/obj-4.3-arm-none-eabi-lite/host-libs-2009q1-161-arm-none-eabi-i686-mingw32/usr –disable-libgomp –enable-poison-system-directories –with-build-time-tools=/scratch/maxim/arm-lite/obj-4.3-arm-none-eabi-lite/tools-i686-pc-linux-gnu-2009q1-161-arm-none-eabi-i686-mingw32/arm-none-eabi/bin –with-build-time-tools=/scratch/maxim/arm-lite/obj-4.3-arm-none-eabi-lite/tools-i686-pc-linux-gnu-2009q1-161-arm-none-eabi-i686-mingw32/arm-none-eabi/bin
Thread model: single
gcc version 4.3.3 (Sourcery G++ Lite 2009q1-161)
configure:3090: $? = 0
configure:3097: /cygdrive/c/_devtools/CodeSourcery/SourceryG++Lite/arm-none-eabi/bin/g++ -V >&5
g++.exe: ‘-V’ option must have argument
configure:3101: $? = 1
configure:3124: checking for C++ compiler default output file name
configure:3146: /cygdrive/c/_devtools/CodeSourcery/SourceryG++Lite/arm-none-eabi/bin/g++ -fsigned-char -pipe conftest.cpp >&5
g++.exe: CreateProcess: No such file or directory
configure:3150: $? = 1
configure:3188: result:
configure: failed program was:

Do you have an idea what i’ve done wrong?