BUG: The current event queue and the main event queue are not the same.... #7474

subokita · 2016-10-13T05:14:51Z

System information (version)

OpenCV => 3.1.0
Operating System / Platform => Mac OSX El Capitan 10.11.6 (Also in Mac OSX Sierra)
Compiler => clang

Detailed description

Running a C++ program using OpenCV3 throws out the following message:

BUG: The current event queue and the main event queue are not the same. Events will not be handled correctly. This is probably because _TSGetMainThread was called for the first time off the main thread.

The OpenCV3 is installed thru homebrew

Steps to reproduce

First the installation of opencv3 is done using homebrew, to zero-in the bug, I've also tried to uninstall all other dependencies first:

brew uninstall --force tbb
brew uninstall --force ffmpeg
brew uninstall --force python3
brew uninstall --force libtiff
brew uninstall --force libpng
brew uninstall --force opencv3
brew install opencv3 --HEAD --c++11
brew link --overwrite --force opencv3

Second after compiling my C++ program using CMake and Make, I try to run it, which leads to the
following message: BUG: The current event queue and the main event queue are not the same. Events will not be handled correctly. This is probably because _TSGetMainThread was called for the first time off the main thread.

Here's the simple C++ program:

int main(int argc, const char * argv[]) {
    string video_filename = "./IMG_0879.m4v";
    VideoCapture capture = VideoCapture(video_filename);

    string image_filename = "./IMG_0879.jpg";
    Mat image = imread(image_filename);
    namedWindow("");
    imshow("", image);
    waitKey(10);
    return 0;
}

The text was updated successfully, but these errors were encountered:

subokita · 2016-10-18T03:14:32Z

Seems to be fixed by reinstalling opencv3 with --with-ffmpeg flag.

mshabunin · 2016-10-18T10:14:39Z

Looks like there is no problem in OpenCV. Feel free to reopen if you have more information.

KleinYuan · 2016-10-23T00:47:11Z

Run into similar issue when working with openCV (2.4.13) and python (2.7.12) on fresh new Mac (macOS 10.12).
Use pycharm community IDE to run an algorithm I developed (same code running without no problem on another mac OS X10.11.6, python 2.7.12, openCV 2.4.13).

here's the error:

2016-10-22 17:34:42.733 Python[4882:255026] 
!!! BUG: The current event queue and the main event queue are not the same. 
Events will not be handled correctly. 
This is probably because _TSGetMainThread was called for the first time off the main thread.

Also, same solution.

It's because ffmpeg was not installed together with OpenCV. Reinstalled with that flag solved this issue.

relikd · 2017-01-22T19:41:10Z

Same issue here. Can you give me a quick walkthrough on how to reinstall OpenCV with mentioned flag?

I have tried an install with CMake GUI and with this instructions.

However I get:

Can't find ffmpeg - 'pkg-config' utility is missing
  ...
  Video I/O:
    DC1394 1.x:                  NO
    DC1394 2.x:                  NO
    FFMPEG:                      NO
      avcodec:                   NO
      avformat:                  NO
      avutil:                    NO
      swscale:                   NO
      avresample:                NO
    ...

( ffmpeg Mac package is installed)

bharath063 · 2017-02-22T20:49:12Z

@subokita Can you provide us with the steps to compile with ffmpeg on Sierra?

relikd · 2017-02-22T20:52:28Z

@bharath063 It worked for me with homebrew:

brew install ffmpeg
brew tap homebrew/science
brew install --HEAD opencv --with-ffmpeg

bharath063 · 2017-02-22T23:19:29Z

@relikd Thanks! But I had faced an issue when installing opencv through homebrew on sierra because of the QTKit deprecation. So I had followed this -> http://www.pyimagesearch.com/2016/11/28/macos-install-opencv-3-and-python-2-7/ tutorial to compile from source.

abdullahselek · 2017-06-11T20:43:15Z

Thanks @relikd this also worked for me.

tpmeyer1 · 2017-11-25T13:33:40Z

@relikd
It didn't work for me! I have Mac OS X El Capitan. Running python 3.6.3
When I tried using the --HEAD flag, it failed, so I ran without the flag. cut-and-paste below:

Thomass-iMac:bin tpmeyer$ brew install ffmpeg
==> Downloading https://homebrew.bintray.com/bottles/ffmpeg-3.4.el_capitan.bottle.tar.gz
Already downloaded: /Users/tpmeyer/Library/Caches/Homebrew/ffmpeg-3.4.el_capitan.bottle.tar.gz
==> Pouring ffmpeg-3.4.el_capitan.bottle.tar.gz
🍺 /usr/local/Cellar/ffmpeg/3.4: 248 files, 51.6MB
Thomass-iMac:bin tpmeyer$ brew tap homebrew/science
Thomass-iMac:bin tpmeyer$ brew install --HEAD opencv3 --with-ffmpeg
Error: No head is defined for opencv
Thomass-iMac:bin tpmeyer$ brew install opencv3 --with-ffmpeg
Warning: opencv: this formula has no --with-ffmpeg option so it will be ignored!
==> Downloading https://homebrew.bintray.com/bottles/opencv-3.3.1_1.el_capitan.bottle.1.tar.gz
Already downloaded: /Users/tpmeyer/Library/Caches/Homebrew/opencv-3.3.1_1.el_capitan.bottle.1.tar.gz
==> Pouring opencv-3.3.1_1.el_capitan.bottle.1.tar.gz
🍺 /usr/local/Cellar/opencv/3.3.1_1: 519 files, 97.9MB

Then when I run my image detection code, it works (sort of, except I can't detect keyboard or mouse) and I still get this error:
GVA info: Successfully connected to the Intel plugin, offline Gen75
2017-11-25 07:28:10.897 Python[24977:913156] !!! BUG: The current event queue and the main event queue are not the same. Events will not be handled correctly. This is probably because _TSGetMainThread was called for the first time off the main thread.

relikd · 2017-11-25T15:02:09Z

I noticed you typed opencv3 instead of just opencv (I think both will install v3 anyway but I'm not sure about that).
If this isn't working you can also try the following:

Save this in a desktop file named myBrewfile.txt:

brew tap homebrew/science
brew "opencv", args: ["c++11", "with-ffmpeg"], link: false

Run brew bundle --file="~/Desktop/myBrewfile.txt"

At least thats what my brew bundle dump command will return (and I have v3 installed). Don't know if it saved all the parameters during install. Also don't know if you have ffmpeg to be installed before or not. (btw. I am currently running El Capitain too)

tpmeyer1 · 2017-11-25T15:08:44Z

Thank you for such quick response!!! I tried what you asked (at least I think I did it right), and got an error: Thomass-iMac:~ tpmeyer$ cat ~/Desktop/myBrewfile.txt brew tap homebrew/science brew "opencv", args: ["c++11", "with-ffmpeg"], link: false Thomass-iMac:~ tpmeyer$ brew bundle --file="~/Desktop/myBrewfile.txt" Error: Invalid Brewfile: undefined local variable or method `homebrew' for #<Bundle::Dsl:0x000001018fbe28>

…

On Sat, Nov 25, 2017 at 9:02 AM, Oleg Geier ***@***.***> wrote: I noticed you typed opencv3 instead of just opencv (I think both will install v3 anyway but I'm not sure about that. If this isn't working you can also try the following: 1. Save this in a desktop file named myBrewfile.txt: brew tap homebrew/science brew "opencv", args: ["c++11", "with-ffmpeg"], link: false 1. Run brew bundle --file="~/Desktop/myBrewfile.txt" At least thats what my brew bundle dump command will return. Don't know if it saved all the parameters during install. Also don't know if you have ffmpeg to be installed before or not. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7474 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AgaHPxsfuzKAefzn4jyK3fhGf7VVgMOwks5s6CwXgaJpZM4KVfl7> .

relikd · 2017-11-25T15:17:47Z

Try delete the brew tap line if you already tapped into science manually.
If you still get an error search google for the problem

tpmeyer1 · 2017-11-25T15:35:41Z

When I removed the tap line as instructed, the command worked as intended, and reported that the Brewfile dependency was installed, but It did not solve the event queue error.
I tried it with and without ffmpeg installed beforehand.

Thomass-iMac:~ tpmeyer$ brew bundle --file="~/Desktop/myBrewfile.txt"
Using opencv
Homebrew Bundle complete! 1 Brewfile dependency now installed.

In /usr/local/Cellar, I have
ffmpeg version 3.4
opencv version 3.3.1_1
python3 version 3.6.3

Are those the same versions that are working for you?

relikd · 2017-11-25T17:48:57Z

Haven't used OpenCV in months. I have two ffmpeg versions installed v3.2.2 and v3.4.
OpenCV is at v3.2.0. Python3 is v3.6.3.
Beyond my first comment I can't even tell you how I installed it.
Good luck finding a solution

mshabunin added invalid and removed platform: ios/osx labels Oct 18, 2016

mshabunin closed this as completed Oct 18, 2016

brentmsmith mentioned this issue Apr 23, 2019

opencv 4.1: BUG: The current event queue and the main event queue are not the same. Events will not be handled correctly. #14396

Closed

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BUG: The current event queue and the main event queue are not the same.... #7474

BUG: The current event queue and the main event queue are not the same.... #7474

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BUG: The current event queue and the main event queue are not the same.... #7474

BUG: The current event queue and the main event queue are not the same.... #7474

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System information (version)

Detailed description

Steps to reproduce

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