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I downloaded the latest from web , I tried using the github version but it was not compiling . since I have all my modules found I will just live with it for now , don't want to break the running opencv thanks for your time n help

thanks for your help

sorry after closing the previous thread I tested and I can't find the "'BackgroundSubtractorMOG2'" module ? I have the MOG and GMG in the sv2.bgsegm though.

[root@hadoop1 scripts]# python
Python 3.3.3 (default, Nov 16 2016, 14:57:45)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> fpbg=cv2.BackgroundSubtractorMOG2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'BackgroundSubtractorMOG2'
>>> import cv2.bgsegm
>>> fpbg=cv2.BackgroundSubtractorMOG2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'BackgroundSubtractorMOG2'
>>>

the CVID codec worked for me , and I found it by entering a "-1" instead of the codec and then manually selected the right codec. thanks for your help and advise as always

ok I understand now . thanks a lot

check this site from openCV its saying the version as "3.1-0-dev" , is this a different version than the one I have installed and if yes where can I download it or is it a matter of just the right CMAKE options ?

The background subtraction function location they are showing are different from what I have , mine are in "cv2.bgsegm"

Also the site is showing three modules for subtraction where as I have only two if I do " >>>help(cv2.bgsegm) "createBackgroundSubtractorGMG" and "createBackgroundSubtractorMOG"

(http://docs.opencv.org/trunk/db/d5c/t...)

[root@hadoop1 build]# python
Python 3.3.3 (default, Nov 16 2016, 14:57:45)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__version__
'3.1.0'
>>>

cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local -DBUILD_NEW_PYTHON_SUPPORT=ON -DWITH_TBB=ON -DBUILD_TBB=ON -DWITH_OPENGL=ON -DWITH_EIGEN=ON -DFFMPEG_INCLUDE_DIR=/usr/local/include -DOPENCV_EXTRA_MODULES_PATH=/root/opencv_contrib/modules -DBUILD_opencv_legacy=OFF ..

thanks it worked now you can add your comment as an answer since I don't want to take the credit . I have opened a new case since now the make is failing . :( if you can kindly look at that

I am on centos6.8 and trying to build an opencv3.x-dev environment but cmake is failing with following error

cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local -DBUILD_NEW_PYTHON_SUPPORT=ON -DWITH_TBB=ON -DBUILD_TBB=ON -DWITH_OPENGL=ON -DWITH_EIGEN=ON -DFFMPEG_INCLUDE_DIR=/usr/local/include -DOPENCV_EXTRA_MODULES_PATH=/root/opencv_contrib/modules -DBUILD_opencv_legacy=OFF ..


[ 80%] Generating precomp.hpp.gch/opencv_aruco_RELEASE.gch
[ 80%] Built target pch_Generate_opencv_aruco
Scanning dependencies of target opencv_aruco
[ 80%] Building CXX object modules/aruco/CMakeFiles/opencv_aruco.dir/src/aruco.cpp.o
/root/opencv_contrib/modules/aruco/src/aruco.cpp: In function ‘double cv::aruco::calibrateCameraAruco(const cv::_InputArray&, const cv::_InputArray&, const cv::_InputArray&, const cv::Ptr<cv::aruco::Board>&, cv::Size, const cv::_InputOutputArray&, const cv::_InputOutputArray&, const cv::_OutputArray&, const cv::_OutputArray&, const cv::_OutputArray&, const cv::_OutputArray&, const cv::_OutputArray&, int, cv::TermCriteria)’:
/root/opencv_contrib/modules/aruco/src/aruco.cpp:1585: error: cannot convert ‘const cv::_OutputArray’ to ‘int’ for argument ‘8’ to ‘double cv::calibrateCamera(const cv::_InputArray&, const cv::_InputArray&, cv::Size, const cv::_InputOutputArray&, const cv::_InputOutputArray&, const cv::_OutputArray&, const cv::_OutputArray&, int, cv::TermCriteria)’
make[2]: *** [modules/aruco/CMakeFiles/opencv_aruco.dir/src/aruco.cpp.o] Error 1
make[1]: *** [modules/aruco/CMakeFiles/opencv_aruco.dir/all] Error 2
make: *** [all] Error 2
[root@hadoop1 build]#

ok I found all the files at this URL

link text

I replaced the bootdesc_bgm.I with the file from the url you sent and it accepted it . but now its complaining about another file "bootdesc_bgm_bi.I" can you also send me the url for this one as if I google it I get no links . thanks

I checked your URL but they are only file names and not the file itself. Can you or someone send me this file please ?
my curl version is :

[admin@hadoop1 atlas]$ curl --version
    curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.21 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
    Protocols: tftp ftp telnet dict ldap ldaps http file https ftps scp sftp
    Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz
    [admin@hadoop1 atlas]$

I am trying to build opencv but cmake is failing with the following error , i have had this before and i could find the files and manually put them on the server but this time this file "bootdesc_bgm.i" is no where to be found , please help. I even upgraded my cmake to 3.0 .

-- Check contents of boostdesc_bgm.i ...
-- Downloading boostdesc_bgm.i...
CMake Error at /root/opencv/cmake/OpenCVUtils.cmake:895 (file):
  file DOWNLOAD HASH mismatch

    for file: [/root/opencv_contrib/modules/xfeatures2d/cmake/.download/0ea90e7a8f3f7876d450e4149c97c74f/boostdesc_bgm.i]
      expected hash: [0ea90e7a8f3f7876d450e4149c97c74f]
        actual hash: [d41d8cd98f00b204e9800998ecf8427e]
             status: [1;"unsupported protocol"]

here is the cmake command i am using

cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local -DBUILD_NEW_PYTHON_SUPPORT=ON -DWITH_TBB=ON -DBUILD_TBB=ON -DWITH_OPENGL=ON -DWITH_EIGEN=ON -DFFMPEG_INCLUDE_DIR=/usr/local/include -DOPENCV_EXTRA_MODULES_PATH=/root/opencv_contrib/modules -DBUILD_opencv_legacy=OFF ..

I can read and play the file but when I write a mp4 or even avi video its not playable . I have confirmed that ffmpeg can create the video fine so why from openCV its not working? iam using openCV 3.1.0 and python 3.3

ffmpeg -i /tmp/kyak.mp4 -vcodec libx264 -f mp4 /tmp/a.mp4

the code below produces the file but it contains zero frame as shown by ffmpeg command .

import numpy as np
import cv2

cap = cv2.VideoCapture('/tmp/kyak.mp4')

fourcc = cv2.VideoWriter_fourcc('X','2','6','4')

out = cv2.VideoWriter('/tmp/output.mp4',fourcc, 20.0, (640,480))

while (cap.isOpened()):
        ret,frame=cap.read()
        if ret == True:

                gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)

                #write the gray frame
                out.write(gray)

                cv2.imshow('frame',gray)

                if cv2.waitKey(30) & 0xFF == ord('q'):
                        break
        else:
                break
cap.release()
out.release()
cv2.destroyAllWindows()

The video plays but I get this error from the code above :

OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 28 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x00000021/'!???'

if I replace the "fourcc" with "0x00000021" then the error goes away but still the produced file has zero frame .

[root@hadoop1 scripts]# ffmpeg -i /tmp/output.mp4
ffmpeg version N-82533-gae514b1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
  configuration: --enable-libx264 --enable-gpl --enable-shared
  libavutil      55. 40.100 / 55. 40.100
  libavcodec     57. 66.105 / 57. 66.105
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 67.100 /  6. 67.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.57.100
  Duration: 00:00:00.00, bitrate: N/A

I have tried many codecs , all but the last one produce 0 bytes video, the last codec does produce a video file with some but then its not playable . This problem is driving me crazy , The code I am using is tested by other users n working. I have copied the opencv_ffmpeg310_64.dll file into the c:\python2.7 folder. I am on windows 10 and opencv 3.1.0 I tried all types of CODEC none are working.

 import numpy as np
    import cv2

    cap = cv2.VideoCapture(0)

    # Define the codec and create VideoWriter object
# Define the codec and create VideoWriter object
#fourcc = cv2.VideoWriter_fourcc(*'FFV1')
#fourcc = cv2.VideoWriter_fourcc(*'XVID')
#fourcc = cv2.VideoWriter_fourcc(*'DIVX')
#fourcc = cv2.VideoWriter_fourcc(*'DIV3')
#fourcc = cv2.VideoWriter_fourcc('F','M','P','4')
#fourcc = cv2.VideoWriter_fourcc('D','I','V','X')
#fourcc = cv2.VideoWriter_fourcc('D','I','V','3')
#fourcc = cv2.VideoWriter_fourcc('F','F','V','1')


fourcc = cv2.VideoWriter_fourcc('M','J','P','G')
    out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))

    while(cap.isOpened()):
        ret, frame = cap.read()
        if ret==True:
            frame = cv2.flip(frame,0)

            # write the flipped frame
            out.write(frame)

            cv2.imshow('frame',frame)
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break
        else:
            break

    # Release everything if job is finished
    cap.release()
    out.release()
    cv2.destroyAllWindows()

as Berak pointed out the program was not detecting the face because of the tilt in the head of more than 20 deg . so its not broken , its working as designed.

found the solution online : put the following in the code to finD the classpath and copy the "xml" and "png" files to this location .

System.out.println(System.getProperty("java.class.path"));

the issue is fixed by using the build file (I found on web) and copying the opencv-248.jar in the ./lib folder

build.sbt DetectFaceDemo.java lib project target [root@hadoop1 java]# more build.sbt

name := "opencv_usage_scala"

scalaVersion := "2.11.6"

scalacOptions ++= Seq( "-unchecked", "-deprecation", "-optimize", "-Xlint" )

javaOptions in run += "-Djava.library.path=./lib"

lazy val root = (project in file("."))

fork := true

I can display an image file fine after setting the DISPLAY variable but when I try to run the following video code from the opencv site , I get nothing , no video window is opened ? the demo I am following is :

http://opencv-python-tutroals.readthe...

please see the code and the output below :

[root@hadoop1 basic-motion-detection]# more demo1.py
import numpy as np
import cv2

cap = cv2.VideoCapture('/home/admin/example_02.mp4')

print cap.get(5) #to display frame rate of video
#print cap.get(cv2.cv.CV_CAP_PROP_FPS)

while(cap.isOpened()):
    ret, frame = cap.read()

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) #convert to grayscale

    cv2.imshow('frame',gray)
    waitKey(50)
    if cv2.waitKey(25) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()
[root@hadoop1 basic-motion-detection]# python demo1.py
0.0
[root@hadoop1 basic-motion-detection]#

I modified the above code and added the creation of window (as its used in the display image example) , but to no use.

[root@hadoop1 basic-motion-detection]# more demo1.py
import numpy as np
import cv2

cap = cv2.VideoCapture('/home/admin/example_02.mp4')

while(cap.isOpened()):
    ret, frame = cap.read()

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    cv2.startWindowThread()
    cv2.namedWindow("preview")
    cv2.imshow('preview',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

looking at the last picture I loaded , do you think its tilted that's why the area detected is very small ? also is there any program example in openCV that can detect animal shapes like dog or cat etc?

added another picture , the program also failed to detect the complete face but detected and marked just the eye area. ?

also is it supposed to only detect faces in upright position ? I rotated the Donald Trump image 90 deg and then it only draws a small rectangle around the eye area and not the complete face , please see attached picture.

sure will do! in meantime I downloaded a picture of Donald Trump and it works. so something wrong with the English queen :) can someone try to use this picture (I uploaded it ) and see why this program does not detect face on it ?

here I proved that it has to be the file because I didn't modify the code and just replace the file queen.png with lena1.png and it detects the face . i have uploaded the image file so you can test if you can read it ?

hi Berak the code is not failing though , like I said even without modifying the code if I just replace the files it either detects the face or not .