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  • trying to make OpenCV 3.2.0 work with virtualenv

    24 juillet 2017, par lollercoaster

    I’m on Ubuntu 16.04 with Python 2.7 and virtualenv & virtualenvwrapper.

    By following this guide I managed to get the following script working with my system Python2.7 which has cv2 globally installed.

    I used this script to install it :

    ######################################
    # INSTALL OPENCV ON UBUNTU OR DEBIAN #
    ######################################

    # |         THIS SCRIPT IS TESTED CORRECTLY ON         |
    # |----------------------------------------------------|
    # | OS             | OpenCV       | Test | Last test   |
    # |----------------|--------------|------|-------------|
    # | Ubuntu 16.04.2 | OpenCV 3.2.0 | OK   | 20 May 2017 |
    # | Debian 8.8     | OpenCV 3.2.0 | OK   | 20 May 2017 |
    # | Debian 9.0     | OpenCV 3.2.0 | OK   | 25 Jun 2017 |

    # 1. KEEP UBUNTU OR DEBIAN UP TO DATE

    sudo apt-get -y update
    sudo apt-get -y upgrade
    sudo apt-get -y dist-upgrade
    sudo apt-get -y autoremove


    # 2. INSTALL THE DEPENDENCIES

    # Build tools:
    sudo apt-get install -y build-essential cmake

    # GUI (if you want to use GTK instead of Qt, replace 'qt5-default' with 'libgtkglext1-dev' and remove '-DWITH_QT=ON' option in CMake):
    sudo apt-get install -y qt5-default libvtk6-dev

    # Media I/O:
    sudo apt-get install -y zlib1g-dev libjpeg-dev libwebp-dev libpng-dev libtiff5-dev libjasper-dev libopenexr-dev libgdal-dev

    # Video I/O:
    sudo apt-get install -y libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev yasm libopencore-amrnb-dev libopencore-amrwb-dev libv4l-dev libxine2-dev

    # Parallelism and linear algebra libraries:
    sudo apt-get install -y libtbb-dev libeigen3-dev

    # Python:
    sudo apt-get install -y python-dev python-tk python-numpy python3-dev python3-tk python3-numpy

    # Documentation:
    sudo apt-get install -y doxygen

    # UI stuff
    sudo apt-get install libgtk-3-dev libatlas-base-dev gfortran


    # 3. INSTALL THE LIBRARY (YOU CAN CHANGE '3.2.0' FOR THE LAST STABLE VERSION)
    sudo apt-get install -y unzip wget

    # opencv contrib
    wget https://github.com/opencv/opencv_contrib/archive/3.2.0.zip -O opencv_contrib-3.2.0.zip
    unzip opencv_contrib-3.2.0.zip
    rm opencv_contrib-3.2.0.zip

    # opencv
    wget https://github.com/opencv/opencv/archive/3.2.0.zip
    unzip 3.2.0.zip
    rm 3.2.0.zip
    mv opencv-3.2.0 OpenCV-3.2.0
    cd OpenCV-3.2.0

    mkdir build
    cd build
    cmake -D WITH_QT=ON \
       -D WITH_OPENGL=ON \
       -D FORCE_VTK=ON \
       -D WITH_TBB=ON \
       -D WITH_GDAL=ON \
       -D WITH_XINE=ON \
       -D BUILD_EXAMPLES=ON \
       -D INSTALL_PYTHON_EXAMPLES=ON \
       -D ENABLE_PRECOMPILED_HEADERS=OFF \
       -D BUILD_NEW_PYTHON_SUPPORT=ON \
       ..

    make -j4
    sudo make install
    sudo ldconfig


    # 4. EXECUTE SOME OPENCV EXAMPLES AND COMPILE A DEMONSTRATION

    # To complete this step, please visit 'http://milq.github.io/install-opencv-ubuntu-debian'.

    The following script below works great with that system-wide installation :

    import cv2

    img = cv2.imread('some_img.jpg')

    Though this one doesn’t - even the system Python can’t read videos for some reason...

    import cv2

    video_capture = cv2.VideoCapture(0)
    ret, frame = video_capture.read()
    print ret  # always False

    but I want it to work with my virtualenv. So I recompiled OpenCV with :

    cmake -D WITH_QT=ON \
       -D WITH_OPENGL=ON \
       -D FORCE_VTK=ON \
       -D WITH_TBB=ON \
       -D WITH_GDAL=ON \
       -D WITH_XINE=ON \
       -D BUILD_EXAMPLES=ON \
       -D INSTALL_PYTHON_EXAMPLES=ON \
       -D ENABLE_PRECOMPILED_HEADERS=OFF \
       -D BUILD_NEW_PYTHON_SUPPORT=ON \
       -D OPENCV_EXTRA_MODULES_PATH=/home/me/code/myproject/opencv_contrib-3.2.0/modules \
       -D PYTHON_EXECUTABLE=~/.envs/myenv/bin/python \
       ..

    make -j4
    sudo make install
    sudo ldconfig

    Here’s the CMake log :

    -- Found VTK ver. 6.2.0 (usefile: /usr/lib/cmake/vtk-6.2/UseVTK.cmake)
    -- Caffe:   NO
    -- Protobuf:   YES
    -- Glog:   NO
    -- freetype2:   YES
    -- harfbuzz:    YES
    -- Module opencv_sfm disabled because the following dependencies are not found: Glog/Gflags
    -- freetype2:   YES
    -- harfbuzz:    YES
    -- Checking for modules 'tesseract;lept'
    --   No package 'tesseract' found
    --   No package 'lept' found
    -- Tesseract:   NO
    -- Check contents of vgg_generated_48.i ...
    -- Check contents of vgg_generated_64.i ...
    -- Check contents of vgg_generated_80.i ...
    -- Check contents of vgg_generated_120.i ...
    -- Check contents of boostdesc_bgm.i ...
    -- Check contents of boostdesc_bgm_bi.i ...
    -- Check contents of boostdesc_bgm_hd.i ...
    -- Check contents of boostdesc_binboost_064.i ...
    -- Check contents of boostdesc_binboost_128.i ...
    -- Check contents of boostdesc_binboost_256.i ...
    -- Check contents of boostdesc_lbgm.i ...
    --
    -- General configuration for OpenCV 3.2.0 =====================================
    --   Version control:               817bd7b-dirty
    --
    --   Extra modules:
    --     Location (extra):            /home/me/code/myproject/opencv_contrib-3.2.0/modules
    --     Version control (extra):     817bd7b-dirty
    --
    --   Platform:
    --     Timestamp:                   2017-07-20T18:25:26Z
    --     Host:                        Linux 4.8.0-58-generic x86_64
    --     CMake:                       3.5.1
    --     CMake generator:             Unix Makefiles
    --     CMake build tool:            /usr/bin/make
    --     Configuration:               Release
    --
    --   C/C++:
    --     Built as dynamic libs?:      YES
    --     C++ Compiler:                /usr/bin/c++  (ver 5.4.0)
    --     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
    --     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    --     C Compiler:                  /usr/bin/cc
    --     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
    --     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
    --     Linker flags (Release):
    --     Linker flags (Debug):
    --     ccache:                      NO
    --     Precompiled headers:         NO
    --     Extra dependencies:          Qt5::Test Qt5::Concurrent Qt5::OpenGL /usr/lib/x86_64-linux-gnu/libwebp.so /usr/lib/x86_64-linux-gnu/libjasper.so /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so /usr/lib/libgdal.so dc1394 xine avcodec-ffmpeg avformat-ffmpeg avutil-ffmpeg swscale-ffmpeg Qt5::Core Qt5::Gui Qt5::Widgets /usr/lib/x86_64-linux-gnu/hdf5/serial/lib/libhdf5.so /usr/lib/x86_64-linux-gnu/libpthread.so /usr/lib/x86_64-linux-gnu/libsz.so /usr/lib/x86_64-linux-gnu/libdl.so /usr/lib/x86_64-linux-gnu/libm.so vtkRenderingOpenGL vtkImagingHybrid vtkIOImage vtkCommonDataModel vtkCommonMath vtkCommonCore vtksys vtkCommonMisc vtkCommonSystem vtkCommonTransforms vtkCommonExecutionModel vtkDICOMParser vtkIOCore /usr/lib/x86_64-linux-gnu/libz.so vtkmetaio /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/x86_64-linux-gnu/libpng.so /usr/lib/x86_64-linux-gnu/libtiff.so vtkImagingCore vtkRenderingCore vtkCommonColor vtkFiltersExtraction vtkFiltersCore vtkFiltersGeneral vtkCommonComputationalGeometry vtkFiltersStatistics vtkImagingFourier vtkalglib vtkFiltersGeometry vtkFiltersSources vtkInteractionStyle vtkRenderingLOD vtkFiltersModeling vtkIOPLY vtkIOGeometry /usr/lib/x86_64-linux-gnu/libjsoncpp.so vtkFiltersTexture vtkRenderingFreeType /usr/lib/x86_64-linux-gnu/libfreetype.so vtkftgl vtkIOExport vtkRenderingAnnotation vtkImagingColor vtkRenderingContext2D vtkRenderingGL2PS vtkRenderingContextOpenGL /usr/lib/libgl2ps.so vtkRenderingLabel dl m pthread rt /usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so tbb
    --     3rdparty dependencies:       libprotobuf
    --
    --   OpenCV modules:
    --     To be built:                 core flann hdf imgproc ml photo reg surface_matching video viz dnn freetype fuzzy imgcodecs shape videoio highgui objdetect plot superres ts xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib cvv datasets rgbd stereo tracking videostab xfeatures2d ximgproc aruco optflow phase_unwrapping stitching structured_light java python2 python3
    --     Disabled:                    world contrib_world
    --     Disabled by dependency:      -
    --     Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cnn_3dobj matlab sfm
    --
    --   GUI:
    --     QT 5.x:                      YES (ver 5.5.1)
    --     QT OpenGL support:           YES (Qt5::OpenGL 5.5.1)
    --     OpenGL support:              YES (/usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so)
    --     VTK support:                 YES (ver 6.2.0)
    --
    --   Media I/O:
    --     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.8)
    --     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
    --     WEBP:                        /usr/lib/x86_64-linux-gnu/libwebp.so (ver encoder: 0x0202)
    --     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.54)
    --     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 4.0.6)
    --     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
    --     OpenEXR:                     /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2.2.0)
    --     GDAL:                        /usr/lib/libgdal.so
    --     GDCM:                        NO
    --
    --   Video I/O:
    --     DC1394 1.x:                  NO
    --     DC1394 2.x:                  YES (ver 2.2.4)
    --     FFMPEG:                      YES
    --       avcodec:                   YES (ver 56.60.100)
    --       avformat:                  YES (ver 56.40.101)
    --       avutil:                    YES (ver 54.31.100)
    --       swscale:                   YES (ver 3.1.101)
    --       avresample:                NO
    --     GStreamer:                   NO
    --     OpenNI:                      NO
    --     OpenNI PrimeSensor Modules:  NO
    --     OpenNI2:                     NO
    --     PvAPI:                       NO
    --     GigEVisionSDK:               NO
    --     Aravis SDK:                  NO
    --     UniCap:                      NO
    --     UniCap ucil:                 NO
    --     V4L/V4L2:                    NO/YES
    --     XIMEA:                       NO
    --     Xine:                        YES (ver 1.2.6)
    --     gPhoto2:                     NO
    --
    --   Parallel framework:            TBB (ver 4.4 interface 9002)
    --
    --   Other third-party libraries:
    --     Use IPP:                     9.0.1 [9.0.1]
    --          at:                     /home/me/code/myproject/OpenCV-3.2.0/build/3rdparty/ippicv/ippicv_lnx
    --     Use IPP Async:               NO
    --     Use VA:                      NO
    --     Use Intel VA-API/OpenCL:     NO
    --     Use Lapack:                  NO
    --     Use Eigen:                   YES (ver 3.2.92)
    --     Use Cuda:                    NO
    --     Use OpenCL:                  YES
    --     Use OpenVX:                  NO
    --     Use custom HAL:              NO
    --
    --   OpenCL:                        <dynamic loading="loading" of="of" opencl="opencl" library="library">
    --     Include path:                /home/me/code/myproject/OpenCV-3.2.0/3rdparty/include/opencl/1.2
    --     Use AMDFFT:                  NO
    --     Use AMDBLAS:                 NO
    --
    --   Python 2:
    --     Interpreter:                 /home/me/.envs/myenv/bin/python (ver 2.7.12)
    --     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.12)
    --     numpy:                       /home/me/.envs/myenv/local/lib/python2.7/site-packages/numpy/core/include (ver 1.13.1)
    --     packages path:               lib/python2.7/site-packages
    --
    --   Python 3:
    --     Interpreter:                 /usr/bin/python3 (ver 3.5.2)
    --     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.5m.so (ver 3.5.2)
    --     numpy:                       /usr/lib/python3/dist-packages/numpy/core/include (ver 1.11.0)
    --     packages path:               lib/python3.5/dist-packages
    --
    --   Python (for build):            /home/me/.envs/myenv/bin/python
    --
    --   Java:
    --     ant:                         /usr/bin/ant (ver 1.9.6)
    --     JNI:                         /usr/lib/jvm/default-java/include /usr/lib/jvm/default-java/include/linux /usr/lib/jvm/default-java/include
    --     Java wrappers:               YES
    --     Java tests:                  YES
    --
    --   Matlab:                        Matlab not found or implicitly disabled
    --
    --   Documentation:
    --     Doxygen:                     /usr/bin/doxygen (ver 1.8.11)
    --
    --   Tests and samples:
    --     Tests:                       YES
    --     Performance tests:           YES
    --     C/C++ Examples:              YES
    --
    --   Install path:                  /usr/local
    --
    --   cvconfig.h is in:              /home/me/code/myproject/OpenCV-3.2.0/build
    -- -----------------------------------------------------------------
    --
    </dynamic>

    Unfortunately, while this works and I can import cv2 in the shell, it cannot read video using the above script, probably due to incorrect compilation or linking of ffmpeg ? The confusing part is the system-wide installation of OpenCV works fine, even without ffmpeg installed !

    What am I doing wrong ? How can I get OpenCV working with a virtualenv ?

    ====

    EDIT : Running the C++ video writing example has this result :

    $ cd /home/me/code/myproject/OpenCV-3.2.0/build/bin
    $ ./cpp-tutorial-video-write ../../samples/data/vtest.avi R Y
    ------------------------------------------------------------------------------
    This program shows how to write video files.
    You can extract the R or G or B color channel of the input video.
    Usage:
    ./video-write  [ R | G | B] [Y | N]
    ------------------------------------------------------------------------------

    OpenCV: FFMPEG: tag 0xffffffff/'����' is not found (format 'avi / AVI (Audio Video Interleaved)')'

    (cpp-tutorial-video-write:19523): GStreamer-CRITICAL **: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
    OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv backend does not support this codec.) in CvVideoWriter_GStreamer::open, file /home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_gstreamer.cpp, line 1388
    VIDEOIO(cvCreateVideoWriter_GStreamer(filename, fourcc, fps, frameSize, is_color)): raised OpenCV exception:

    /home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_gstreamer.cpp:1388: error: (-210) Gstreamer Opencv backend does not support this codec. in function CvVideoWriter_GStreamer::open

    Could not open the output video for write: ../../samples/data/vtest.avi

    And the opencv_test_videoio unit test reports the following : https://pastebin.com/q4mf224Q

    However, running the c++ video starter example DOES work, with the following command and output, I can see the webcam working and streaming video in the highgui interface :

    $ ./cpp-example-videocapture_starter 0
    VIDEOIO ERROR: V4L: device 0: Unable to query number of channels
    (ERROR)icvOpenAVI_XINE(): Unable to initialize video driver.
    GStreamer: Error opening bin: no element "0"
    press space to save a picture. q or esc to quit
    init done
    opengl support available
  • How to limit duration of the video with Dropzonejs ?

    20 octobre 2017, par SNaRe

    I have a form which I upload videos and duration/length of the video is important.

    After I upload the file with PHP, I check the duration of the video file size with FFMpeg.

    I calculate duration in PHP and need to send value of the duration via PHP somehow. I think I have to append the duration to $result variable of Json.

    This is my html

       

           <code class="echappe-js">&lt;script src=<br />
           &quot;//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js&quot;&gt;&lt;/script&gt;

    &lt;script src=&quot;https://rawgit.com/enyo/dropzone/master/dist/dropzone.js&quot;&gt;&lt;/script&gt;

    &lt;script type=&quot;text/javascript&quot;&gt;<br />
    <br />
           Dropzone.options.myDropzone = {<br />
    <br />
           maxFiles: 1,<br />
           acceptedFiles: &quot;image/*,video/*&quot;,<br />
           maxfilesexceeded: function (file) {<br />
               this.removeAllFiles();<br />
               this.addFile(file);<br />
               $('#infomsg').hide();<br />
    <br />
           },<br />
    <br />
           init: function () {<br />
               $('#infomsg').hide();<br />
    <br />
               this.on(&quot;success&quot;, function (result) {<br />
    <br />
                   $('#infomsg').show();<br />
    <br />
    <br />
                   $(&quot;#boatAddForm&quot;).append($('&lt;input type=&quot;hidden&quot; ' +<br />
                       'name=&quot;files[]&quot; ' +<br />
                       'value=&quot;' + result.name + '&quot;&gt;'));<br />
    <br />
               });<br />
           }<br />
           };<br />
    <br />
    <br />
           &lt;/script&gt;

    This is the most minimal example of Dropzone. The upload in this
    example doesn’t work, because there is no actual server to handle
    the file upload.

    This is my PHP

    &lt;?php
    $ds          = DIRECTORY_SEPARATOR;

    $storeFolder = 'uploads';

    if (!empty($_FILES)) {

       $tempFile = $_FILES['file']['tmp_name'];

       $targetPath = dirname( __FILE__ ) . $ds. $storeFolder . $ds;

       $targetFile =  $targetPath. $_FILES['file']['name'];

       move_uploaded_file($tempFile,$targetFile);

    } else {
       $result  = array();

       $files = scandir($storeFolder);                 //1
       if ( false!==$files ) {
           foreach ( $files as $file ) {
               if ( '.'!=$file &amp;&amp; '..'!=$file) {       //2
                   $obj['name'] = $file;
                   $obj['size'] = filesize($storeFolder.$ds.$file);
                   $result[] = $obj;
               }
           }
       }

       header('Content-type: text/json');              //3
       header('Content-type: application/json');
       echo json_encode($result);
    }

    If I could check a custom json response right after

    Dropzone.options.myDropzone = {

    like other requirements for success, I won’t have to right if statements in success in order to check the validation.

    Basically I want to do it as I do like

    maxFiles: 1,

    without writing any conditions inside success

  • How to limit duration of the video with Dropzonejs ?

    26 juin 2015, par SNaRe

    I have a form which I upload videos and duration/length of the video is important.

    After I upload the file with PHP, I check the duration of the video file size with FFMpeg.

    I calculate duration in PHP and need to send value of the duration via PHP somehow. I think I have to append the duration to $result variable of Json.

    This is my html

       

           <code class="echappe-js">&lt;script src=<br />
           &quot;//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js&quot;&gt;&lt;/script&gt;

    &lt;script src=&quot;https://rawgit.com/enyo/dropzone/master/dist/dropzone.js&quot;&gt;&lt;/script&gt;

    &lt;script type=&quot;text/javascript&quot;&gt;<br />
    <br />
           Dropzone.options.myDropzone = {<br />
    <br />
           maxFiles: 1,<br />
           acceptedFiles: &quot;image/*,video/*&quot;,<br />
           maxfilesexceeded: function (file) {<br />
               this.removeAllFiles();<br />
               this.addFile(file);<br />
               $('#infomsg').hide();<br />
    <br />
           },<br />
    <br />
           init: function () {<br />
               $('#infomsg').hide();<br />
    <br />
               this.on(&quot;success&quot;, function (result) {<br />
    <br />
                   $('#infomsg').show();<br />
    <br />
    <br />
                   $(&quot;#boatAddForm&quot;).append($('&lt;input type=&quot;hidden&quot; ' +<br />
                       'name=&quot;files[]&quot; ' +<br />
                       'value=&quot;' + result.name + '&quot;&gt;'));<br />
    <br />
               });<br />
           }<br />
           };<br />
    <br />
    <br />
           &lt;/script&gt;

    This is the most minimal example of Dropzone. The upload in this
    example doesn’t work, because there is no actual server to handle
    the file upload.

    This is my PHP

    &lt;?php
    $ds          = DIRECTORY_SEPARATOR;

    $storeFolder = 'uploads';

    if (!empty($_FILES)) {

       $tempFile = $_FILES['file']['tmp_name'];

       $targetPath = dirname( __FILE__ ) . $ds. $storeFolder . $ds;

       $targetFile =  $targetPath. $_FILES['file']['name'];

       move_uploaded_file($tempFile,$targetFile);

    } else {
       $result  = array();

       $files = scandir($storeFolder);                 //1
       if ( false!==$files ) {
           foreach ( $files as $file ) {
               if ( '.'!=$file &amp;&amp; '..'!=$file) {       //2
                   $obj['name'] = $file;
                   $obj['size'] = filesize($storeFolder.$ds.$file);
                   $result[] = $obj;
               }
           }
       }

       header('Content-type: text/json');              //3
       header('Content-type: application/json');
       echo json_encode($result);
    }

    If I could check a custom json response right after

    Dropzone.options.myDropzone = {

    like other requirements for success, I won’t have to right if statements in success in order to check the validation.

    Basically I want to do it as I do like

    maxFiles: 1,

    without writing any conditions inside success