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Subject:	Re: opencv 3.2.0-1: imshow() very slow
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Am 07.05.2017 um 21:16 schrieb René Berber:
> Obviously you are not running dbus-daemon, which accounts for the
> time-out, and the delay, but where does that dependency come from? Is it
> needed? apparently not.
> 
> According to OpenCV's documentation
> (http://docs.opencv.org/2.4/doc/tutorials/introduction/linux_install/linux_install.html)
> there is no such dependency.

Well, I think there were many functionalities added to OpenCV between releases 2.4 and 3.2, so it seems that dbus-daemon is now required. As a 
matter of fact, it is launched in the background the first time I start my 'cvtest' program - here is an extract of a bash session:
___________________________________________________________________________
falkt AT FalksAsusDesktop Mo 2017-05-08 01:35:13 ~
$ python cvtest.py
Image shape: (600, 800, 3)

** (Great title:10460): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. 
Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout 
expired, or the network connection was broken.
26.541 s

falkt AT FalksAsusDesktop Mo 2017-05-08 01:35:54 ~
$ ps
       PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
      6192   10764    2924       4404  ?         197609 01:35:29 /usr/libexec/at-spi-bus-launcher
       396       1   10460        396  pty0      197609 01:35:29 /usr/bin/dbus-launch
      8416    1944    1944       2360  cons0     197609 17:28:14 /usr/bin/xinit
     10744    8416   10744      10244  cons0     197609 17:28:14 /usr/bin/XWin
      1944       1    1944       6284  cons0     197609 17:28:09 /usr/bin/sh
      6492    8416    6492      10288  ?         197609 17:28:16 /usr/bin/sh
      8388    6492    6492       6424  ?         197609 17:28:16 /usr/bin/sleep
      6860    2756    6860       8292  pty0      197609 01:34:52 /usr/bin/bash
     10764    2924    2924      10764  ?         197609 01:35:29 /usr/bin/dbus-daemon
      2756       1    2756       2756  ?         197609 01:34:52 /usr/bin/mintty
      6464    6860    6464       4904  pty0      197609 01:36:01 /usr/bin/ps
      2924       1    2924       2924  ?         197609 01:35:29 /usr/bin/dbus-daemon

falkt AT FalksAsusDesktop Mo 2017-05-08 01:36:01 ~
$
___________________________________________________________________________

Strangely enough, even with dbus-daemon launched, the problem persists.

> Check out the libraries linked, and probably one of them has that
> dependency.  Dbus library is linked somehow, the problem is which other
> library was the one that brought it.  Perhaps checking with pkg-config
> to see which one uses it would help.

When I run cygcheck on the executable generated from the cvtest.cxx program I posted, I get the following list:
___________________________________________________________________________
$ cygcheck ./cvtest.exe
C:\Users\falkt\Documents\cvtest.exe
   C:\cygwin64\bin\cygwin1.dll
     C:\WINDOWS\system32\KERNEL32.dll
       C:\WINDOWS\system32\ntdll.dll
       C:\WINDOWS\system32\KERNELBASE.dll
         C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit\api-ms-win-eventing-provider-l1-1-0.dll
   C:\cygwin64\bin\cygopencv_core-3.2.dll
     C:\cygwin64\bin\cygz.dll
     C:\cygwin64\bin\cyggcc_s-seh-1.dll
     C:\cygwin64\bin\cygstdc++-6.dll
   C:\cygwin64\bin\cygopencv_highgui-3.2.dll
     C:\cygwin64\bin\cygopencv_imgcodecs-3.2.dll
       C:\cygwin64\bin\cygopencv_imgproc-3.2.dll
       C:\cygwin64\bin\cygHalf-12.dll
       C:\cygwin64\bin\cygIlmImf-22.dll
         C:\cygwin64\bin\cygIex-12.dll
         C:\cygwin64\bin\cygIlmThread-12.dll
       C:\cygwin64\bin\cygjasper-4.dll
         C:\cygwin64\bin\cygjpeg-8.dll
       C:\cygwin64\bin\cygpng16-16.dll
       C:\cygwin64\bin\cygtiff-6.dll
         C:\cygwin64\bin\cygjbig-2.dll
         C:\cygwin64\bin\cyglzma-5.dll
       C:\cygwin64\bin\cygwebp-5.dll
     C:\cygwin64\bin\cygcairo-2.dll
       C:\cygwin64\bin\cygEGL-1.dll
         C:\cygwin64\bin\cygexpat-1.dll
         C:\cygwin64\bin\cygX11-xcb-1.dll
         C:\cygwin64\bin\cygxcb-1.dll
           C:\cygwin64\bin\cygXau-6.dll
           C:\cygwin64\bin\cygXdmcp-6.dll
       C:\cygwin64\bin\cygfontconfig-1.dll
         C:\cygwin64\bin\cygfreetype-6.dll
           C:\cygwin64\bin\cygbz2-1.dll
       C:\cygwin64\bin\cygGL-1.dll
         C:\cygwin64\bin\cygglapi-0.dll
         C:\cygwin64\bin\cygX11-6.dll
         C:\cygwin64\bin\cygxcb-glx-0.dll
         C:\cygwin64\bin\cygXext-6.dll
         C:\WINDOWS\system32\GDI32.dll
         C:\WINDOWS\system32\OPENGL32.dll
           C:\WINDOWS\system32\msvcrt.dll
           C:\WINDOWS\system32\ADVAPI32.dll
             C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit\api-ms-win-eventing-controller-l1-1-0.dll
             C:\WINDOWS\system32\SECHOST.dll
               C:\WINDOWS\system32\RPCRT4.dll
           C:\WINDOWS\system32\GLU32.dll
             C:\WINDOWS\system32\USER32.dll
               C:\WINDOWS\system32\win32u.dll
           C:\WINDOWS\system32\DDRAW.dll
             C:\WINDOWS\system32\DCIMAN32.dll
       C:\cygwin64\bin\cygpixman-1-0.dll
       C:\cygwin64\bin\cygxcb-render-0.dll
       C:\cygwin64\bin\cygxcb-shm-0.dll
       C:\cygwin64\bin\cygXrender-1.dll
     C:\cygwin64\bin\cyggdk-3-0.dll
       C:\cygwin64\bin\cygcairo-gobject-2.dll
         C:\cygwin64\bin\cygglib-2.0-0.dll
           C:\cygwin64\bin\cygiconv-2.dll
           C:\cygwin64\bin\cygintl-8.dll
           C:\cygwin64\bin\cygpcre-1.dll
         C:\cygwin64\bin\cyggobject-2.0-0.dll
           C:\cygwin64\bin\cygffi-6.dll
       C:\cygwin64\bin\cygepoxy-0.dll
       C:\cygwin64\bin\cyggdk_pixbuf-2.0-0.dll
         C:\cygwin64\bin\cyggio-2.0-0.dll
           C:\cygwin64\bin\cyggmodule-2.0-0.dll
       C:\cygwin64\bin\cygpango-1.0-0.dll
         C:\cygwin64\bin\cygthai-0.dll
           C:\cygwin64\bin\cygdatrie-1.dll
       C:\cygwin64\bin\cygpangocairo-1.0-0.dll
         C:\cygwin64\bin\cygpangoft2-1.0-0.dll
           C:\cygwin64\bin\cygharfbuzz-0.dll
             C:\cygwin64\bin\cyggraphite2-3.dll
       C:\cygwin64\bin\cygXcomposite-1.dll
       C:\cygwin64\bin\cygXcursor-1.dll
         C:\cygwin64\bin\cygXfixes-3.dll
       C:\cygwin64\bin\cygXdamage-1.dll
       C:\cygwin64\bin\cygXi-6.dll
       C:\cygwin64\bin\cygXinerama-1.dll
       C:\cygwin64\bin\cygXrandr-2.dll
     C:\cygwin64\bin\cyggtk-3-0.dll
       C:\cygwin64\bin\cygatk-1.0-0.dll
       C:\cygwin64\bin\cygatk-bridge-2.0-0.dll
         C:\cygwin64\bin\cygatspi-0.dll
           C:\cygwin64\bin\cygdbus-1-3.dll
___________________________________________________________________________

So effectively cygdbus-1-3.dll appears in the last line.

> Of course there's a better hint on your message: 'org.a11y.Bus'  I have
> no idea what library, or program uses that Dbus ID.  Using Google I
> found
> https://github.com/GNOME/at-spi2-core/blob/master/bus/org.a11y.Bus.service.in
> which is Gnome... so perhaps the OpenCV released only works with Gnome &
> X-Windows running.

Starting the cvtest programs in a Gnome session doesn't change anything: always the same warning message and a 25-seconds delay before 
displaying the picture in a window.
-- Falk

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