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  • Image to MPEG on Linux works, same code on Android = green video

    27 novembre 2014, par JScoobyCed

    EDIT
    I have check the execution and found that the error is not (yet) at the swscale point. My current issue is that the JPG image is not found :
    No such file or directory
    when doing the avformat_open_input(&pFormatCtx, imageFileName, NULL, NULL);
    Before you tell me I need to register anything, I can tell I already did (I updated the code below).
    I also added the Android permission to access the external storage (I don’t think it is related to Android since I can already write to the /mnt/sdcard/ where the image is also located)
    END EDIT

    I have been through several tutorials (including the few posted from SO, i.e. http://dranger.com/ffmpeg/, how to compile ffmpeg for Android...,been through dolphin-player source code). Here is what I have :
    . Compiled ffmpeg for android
    . Ran basic tutorials using NDK to create a dummy video on my android device
    . been able to generate a MPEG2 video from images on Ubuntu using a modified version of dummy video code above and a lot of Googling
    . running the new code on Android device gives a green screen video (duration 1 sec whatever the number of frames I encode)

    I saw another post about iPhone in a similar situation that mentioned the ARM processor optimization could be the culprit. I tried a few ldextra-flags (-arch armv7-a and similar) to no success.

    I include at the end the code that loads the image. Is there something different to do on Android than on linux ? Is my ffmpeg build not correct for Android video encoding ?

    void copyFrame(AVCodecContext *destContext, AVFrame* dest,
    
            AVCodecContext *srcContext, AVFrame* source) {
    
struct SwsContext *swsContext;
    
swsContext = sws_getContext(srcContext->width, srcContext->height, srcContext->pix_fmt,
    
                destContext->width, destContext->height, destContext->pix_fmt,
    
                SWS_FAST_BILINEAR, NULL, NULL, NULL);
    
sws_scale(swsContext, source->data, source->linesize, 0, srcContext->height, dest->data, dest->linesize);
    
sws_freeContext(swsContext);
    
}
    

    
int loadFromFile(const char* imageFileName, AVFrame* realPicture, AVCodecContext* videoContext) {
    
AVFormatContext *pFormatCtx = NULL;
    
avcodec_register_all();
    
av_register_all();
    

    
int ret = avformat_open_input(&pFormatCtx, imageFileName, NULL, NULL);
    
if (ret != 0) {
    
    // ERROR hapening here
    
    // Can't open image file. Use strerror(AVERROR(ret))) for details
    
    return ERR_CANNOT_OPEN_IMAGE;
    
}
    

    
AVCodecContext *pCodecCtx;
    

    
pCodecCtx = pFormatCtx->streams[0]->codec;
    
pCodecCtx->width = W_VIDEO;
    
pCodecCtx->height = H_VIDEO;
    
pCodecCtx->pix_fmt = PIX_FMT_YUV420P;
    

    
// Find the decoder for the video stream
    
AVCodec *pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
    
if (!pCodec) {
    
    // Codec not found
    
    return ERR_CODEC_NOT_FOUND;
    
}
    

    
// Open codec
    
if (avcodec_open(pCodecCtx, pCodec) < 0) {
    
    // Could not open codec
    
    return ERR_CANNOT_OPEN_CODEC;
    
}
    

    
// 
    
AVFrame *pFrame;
    

    
pFrame = avcodec_alloc_frame();
    

    
if (!pFrame) {
    
    // Can't allocate memory for AVFrame
    
    return ERR_CANNOT_ALLOC_MEM;
    
}
    

    
int frameFinished;
    
int numBytes;
    

    
// Determine required buffer size and allocate buffer
    
numBytes = avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
    
uint8_t *buffer = (uint8_t *) av_malloc(numBytes * sizeof (uint8_t));
    

    
avpicture_fill((AVPicture *) pFrame, buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
    
AVPacket packet;
    
int res = 0;
    
while (av_read_frame(pFormatCtx, &packet) >= 0) {
    
    if (packet.stream_index != 0)
    
        continue;
    

    
    ret = avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
    
    if (ret > 0) {
    
        // now, load the useful info into realPicture
    
        copyFrame(videoContext, realPicture, pCodecCtx, pFrame);
    
        // Free the packet that was allocated by av_read_frame
    
        av_free_packet(&packet);
    
        return 0;
    
    } else {
    
        // Error decoding frame. Use strerror(AVERROR(ret))) for details
    
        res = ERR_DECODE_FRAME;
    
    }
    
}
    
av_free(pFrame);
    

    
// close codec
    
avcodec_close(pCodecCtx);
    

    
// Close the image file
    
av_close_input_file(pFormatCtx);
    

    
return res;
    
}

    Some ./configure options :
    --extra-cflags="-O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 -mfloat-abi=softfp -mfpu=vfp -marm -march=armv7-a -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE"

    --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog"

    --arch=armv7-a --enable-armv5te --enable-armv6 --enable-armvfp --enable-memalign-hack

  • Opencv crosscompile with ffmpeg and other 3rdparty for arm board

    16 juin 2017, par Little Tooth

    After buliding Qt5.5.1 for my arm board sucessfully, I am taking up to crosscompile opencv. Here are the steps :

    First, I crosscompile 3rdparty :

    a.libz

    lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -zvxf zlib-1.2.8.tar.gz
    
lmk@lmk-virtual-machine:/home/newdisk$ cd zlib-1.2.8
    
lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo ./configure --prefix=/home/newdisk/optnew/opencv-rely -shared
    
lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo vi Makefile

    and etit Makefile in some details :

    #Makefile
    
CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc
    
LDSHARED= /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map
    
AR=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-ar
    
RANLIB=arm-linux-ranlib

    the last step is run make and make install :

    lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo make
    
lmk@lmk-virtual-machine:/home/newdisk/zlib-1.2.8$ sudo make install

    b.libjpeg

    lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -zvxf jpegsrc.v9.tar.gz
    
lmk@lmk-virtual-machine:/home/newdisk$ cd jpeg-9
    
lmk@lmk-virtual-machine:/home/newdisk/jpeg-9$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --host=arm-linux --prefix=/home/newdisk/optnew/opencv-rely --enable-shared --enable-static
    
lmk@lmk-virtual-machine:/home/newdisk/jpeg-9$ sudo make
    
lmk@lmk-virtual-machine:/home/newdisk/jpeg-9$ sudo make install

    c.libpng

    lmk@lmk-virtual-machine:/home/newdisk$ sudo xz -d libpng-1.6.29.tar.xz
    
lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -xvf libpng-1.6.29.tar
    
lmk@lmk-virtual-machine:/home/newdisk$ cd libpng-1.6.29
    
lmk@lmk-virtual-machine:/home/newdisk/libpng-1.6.29$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --host=arm-linux --prefix=/home/newdisk/optnew/opencv-rely --enable-shared --enable-static
    
lmk@lmk-virtual-machine:/home/newdisk/libpng-1.6.29$ sudo make
    
lmk@lmk-virtual-machine:/home/newdisk/libpng-1.6.29$ sudo make install

    d.yasm

    lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -zvxf yasm-1.3.0.tar.gz
    
lmk@lmk-virtual-machine:/home/newdisk$ cd yasm-1.3.0
    
lmk@lmk-virtual-machine:/home/newdisk/yasm-1.3.0$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --prefix=/home/newdisk/optnew/opencv-rely --host=arm-linux
    
lmk@lmk-virtual-machine:/home/newdisk/yasm-1.3.0$ sudo make
    
lmk@lmk-virtual-machine:/home/newdisk/yasm-1.3.0$ sudo make install

    e.libx264

    lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -jxvf last_x264.tar.bz2
    
lmk@lmk-virtual-machine:/home/newdisk$ cd x264-snapshot-20170612-2245 
    
lmk@lmk-virtual-machine:/home/newdisk/x264-snapshot-20170612-2245$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --enable-shared --host=arm-linux --disable-asm --prefix=/home/newdisk/optnew/opencv-rely
    
lmk@lmk-virtual-machine:/home/newdisk/x264-snapshot-20170612-2245$ sudo make
    
lmk@lmk-virtual-machine:/home/newdisk/x264-snapshot-20170612-2245$ sudo make install

    f.libxvid

    lmk@lmk-virtual-machine:/home/newdisk$ cd xvidcore-1.3.3
    
lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3$ cd build/generic
    
lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3/build/generic$ sudo CC=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc ./configure --prefix=/home/newdisk/optnew/opencv-rely --host=arm-linux  --disable-assembly
    
lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3/build/generic$ sudo make
    
lmk@lmk-virtual-machine:/home/newdisk/xvidcore-1.3.3/build/generic$ sudo make install

    g.ffmpeg

    lmk@lmk-virtual-machine:/home/newdisk$ sudo tar -jvxf ffmpeg-3.3.2.tar.bz2
    
lmk@lmk-virtual-machine:/home/newdisk$ cd ffmpeg-3.3.2
    
lmk@lmk-virtual-machine:/home/newdisk/ffmpeg-3.3.2$
    
sudo ./configure --prefix=/home/newdisk/optnew/opencv-rely --enable-shared --disable-static --enable-gpl --enable-cross-compile  --arch=arm --disable-stripping --target-os=linux --enable-libx264 --enable-libxvid --cc=/home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gcc --enable-swscale --extra-ldflags=-L/home/newdisk/optnew/opencv-rely/lib --extra-cflags=-I/home/newdisk/optnew/opencv-rely/include
    
lmk@lmk-virtual-machine:/home/newdisk/ffmpeg-3.3.2$ sudo make
    
lmk@lmk-virtual-machine:/home/newdisk/ffmpeg-3.3.2$ sudo make install

    There is no problem in 3rdparty crosscompile.
    Next, opencv crosscompile :

    lmk@lmk-virtual-machine:/home/newdisk$ sudo unzip opencv-3.1.0.zip
    
lmk@lmk-virtual-machine:/home/newdisk$ cd opencv-3.1.0
    
lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0$ sudo mkdir BuildOpencv
    
lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0$ cd BuildOpencv
    
lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo vim toolchain.cmake
    
#toolchain.cmake
    
###########user defined#############
    
set( CMAKE_SYSTEM_NAME Linux )
    
set( CMAKE_SYSTEM_PROCESSOR arm )
    
set( CMAKE_C_COMPILER /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-gcc )
    
set( CMAKE_CXX_COMPILER /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++ )
    
###########user defined#############
    
set( CMAKE_FIND_ROOT_PATH /home/newdisk/optnew/opencv-rely)
    
set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
    
set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
    
set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
    
######################################

    Then I run cmake :

    lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo cmake -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake ../

    Here is the result：

    -- Detected version of GNU GCC: 45 (405)
    
-- Found ZLIB: /home/newdisk/optnew/opencv-rely/lib/libz.so (found suitable version "1.2.8", minimum required is "1.2.3") 
    
-- Could NOT find TIFF (missing:  TIFF_LIBRARY TIFF_INCLUDE_DIR) 
    
-- Could NOT find Jasper (missing:  JASPER_LIBRARIES) (found version "1.900.1")
    
-- Found ZLIB: /home/newdisk/optnew/opencv-rely/lib/libz.so (found version "1.2.8") 
    
-- checking for module 'gtk+-3.0'
    
--   package 'gtk+-3.0' not found
    
-- checking for module 'gstreamer-base-1.0'
    
--   package 'gstreamer-base-1.0' not found
    
-- checking for module 'gstreamer-video-1.0'
    
--   package 'gstreamer-video-1.0' not found
    
-- checking for module 'gstreamer-app-1.0'
    
--   package 'gstreamer-app-1.0' not found
    
-- checking for module 'gstreamer-riff-1.0'
    
--   package 'gstreamer-riff-1.0' not found
    
-- checking for module 'gstreamer-pbutils-1.0'
    
--   package 'gstreamer-pbutils-1.0' not found
    
-- checking for module 'gstreamer-base-0.10'
    
--   package 'gstreamer-base-0.10' not found
    
-- checking for module 'gstreamer-video-0.10'
    
--   package 'gstreamer-video-0.10' not found
    
-- checking for module 'gstreamer-app-0.10'
    
--   package 'gstreamer-app-0.10' not found
    
-- checking for module 'gstreamer-riff-0.10'
    
--   package 'gstreamer-riff-0.10' not found
    
-- checking for module 'gstreamer-pbutils-0.10'
    
--   package 'gstreamer-pbutils-0.10' not found
    
-- Looking for linux/videodev.h
    
-- Looking for linux/videodev.h - found
    
-- Looking for linux/videodev2.h
    
-- Looking for linux/videodev2.h - found
    
-- Looking for sys/videoio.h
    
-- Looking for sys/videoio.h - not found
    
-- checking for module 'libavresample'
    
--   package 'libavresample' not found
    
-- Looking for libavformat/avformat.h
    
-- Looking for libavformat/avformat.h - not found
    
-- Looking for ffmpeg/avformat.h
    
-- Looking for ffmpeg/avformat.h - not found
    
-- checking for module 'libgphoto2'
    
 --   package 'libgphoto2' not found
    
-- Could NOT find Doxygen (missing:  DOXYGEN_EXECUTABLE) 
    
-- To enable PlantUML support, set PLANTUML_JAR environment variable or pass -DPLANTUML_JAR=<filepath> option to cmake
    
-- Found PythonInterp: /usr/bin/python2.7 (found suitable version "2.7.6", minimum required is "2.7") 
    
-- Could NOT find PythonLibs (missing:  PYTHON_LIBRARIES) (found suitable version "2.7.6", minimum required is "2.7")
    
-- Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
    
-- If you want to enable Python/Numpy support, set the following variables:
    
--   PYTHON2_INCLUDE_PATH
    
--   PYTHON2_LIBRARIES
    
--   PYTHON2_NUMPY_INCLUDE_DIRS
    
--   PYTHON3_INCLUDE_PATH
    
--   PYTHON3_LIBRARIES
    
--   PYTHON3_NUMPY_INCLUDE_DIRS
    
-- Found PythonInterp: /usr/bin/python3.4 (found suitable version "3.4.3", minimum required is "3.4") 
    
-- Could NOT find PythonLibs (missing:  PYTHON_LIBRARIES) (Required is at least version "3.4")
    
-- Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
    
-- If you want to enable Python/Numpy support, set the following variables:
    
--   PYTHON2_INCLUDE_PATH
    
--   PYTHON2_LIBRARIES
    
--   PYTHON2_NUMPY_INCLUDE_DIRS
    
--   PYTHON3_INCLUDE_PATH
    
--   PYTHON3_LIBRARIES
    
--   PYTHON3_NUMPY_INCLUDE_DIRS
    
-- Could NOT find JNI (missing:  JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
    
-- Could NOT find Matlab (missing:  MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN) 
    
-- 
    
-- General configuration for OpenCV 3.1.0 
    
=====================================
    
--   Version control:               unknown
    
-- 
    
--   Platform:
    
--     Host:                        Linux 3.16.0-77-generic i686
    
--     Target:                      Linux arm
    
--     CMake:                       2.8.12.2
    
--     CMake generator:             Unix Makefiles
    
--     CMake build tool:            /usr/bin/make
    
--     Configuration:               Release
    
-- 
    
--   C/C++:
    
--     Built as dynamic libs?:      YES
    
--     C++ Compiler:                /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++  (ver 4.5.1)
    
--     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 -fdiagnostics-show-option -pthread -fomit-frame-pointer -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 -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    
--     C Compiler:                  /home/newdisk/optnew/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-gcc
    
--     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 -fdiagnostics-show-option -pthread -fomit-frame-pointer -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 -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
    
--     Linker flags (Release):      
    
--     Linker flags (Debug):        
    
--     Precompiled headers:         YES
    
--     Extra dependencies:          /home/newdisk/optnew/opencv-rely/lib/libjpeg.so /home/newdisk/optnew/opencv-rely/lib/libpng.so /home/newdisk/optnew/opencv-rely/lib/libz.so gtk-x11-2.0 gdk-x11-2.0 atk-1.0 gio-2.0 pangoft2-1.0 pangocairo-1.0 gdk_pixbuf-2.0 cairo pango-1.0 fontconfig gobject-2.0 freetype gthread-2.0 glib-2.0 dc1394 v4l1 v4l2 avcodec avformat avutil swscale dl m pthread rt
    
--     3rdparty dependencies:       libwebp libtiff libjasper IlmImf
    
-- 
    
--   OpenCV modules:
    
--     To be built:                 core flann imgproc ml photo video imgcodecs shape videoio highgui objdetect superres ts features2d calib3d stitching videostab
    
--     Disabled:                    world
    
--     Disabled by dependency:      -
    
--     Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 python3 viz
    
-- 
    
--   GUI: 
    
--     QT:                          NO
    
--     GTK+ 2.x:                    YES (ver 2.24.23)
    
--     GThread :                    YES (ver 2.40.2)
    
--     GtkGlExt:                    NO
    
--     OpenGL support:              NO
    
--     VTK support:                 NO
    
-- 
    
--   Media I/O: 
    
--     ZLib:                        /home/newdisk/optnew/opencv-rely/lib/libz.so (ver 1.2.8)
    
--     JPEG:                        /home/newdisk/optnew/opencv-rely/lib/libjpeg.so (ver 90)
    
--     WEBP:                        build (ver 0.3.1)
    
--     PNG:                         /home/newdisk/optnew/opencv-rely/lib/libpng.so (ver 1.6.29)
    
--     TIFF:                        build (ver 42 - 4.0.2)
    
--     JPEG 2000:                   build (ver 1.900.1)
    
--     OpenEXR:                     build (ver 1.7.1)
    
--     GDAL:                        NO
    
-- 
    
--   Video I/O:
    
--     DC1394 1.x:                  NO
    
--     DC1394 2.x:                  YES (ver 2.2.1)
    
--     FFMPEG:                      YES
    
--       codec:                     YES (ver 54.35.1)
    
--       format:                    YES (ver 54.20.4)
    
--       util:                      YES (ver 52.3.0)
    
--       swscale:                   YES (ver 2.1.1)
    
--       resample:                  NO
    
--       gentoo-style:              YES
    
--     GStreamer:                   NO
    
--     OpenNI:                      NO
    
--     OpenNI PrimeSensor Modules:  NO
    
--     OpenNI2:                     NO
    
--     PvAPI:                       NO
    
--     GigEVisionSDK:               NO
    
--     UniCap:                      NO
    
--     UniCap ucil:                 NO
    
--     V4L/V4L2:                    Using libv4l1 (ver 0.8.8) / libv4l2 (ver 0.8.8)
    
--     XIMEA:                       NO
    
--     Xine:                        NO
    
--     gPhoto2:                     NO
    
-- 
    
--   Parallel framework:            pthreads
    
-- 
    
--   Other third-party libraries:
    
--     Use IPP:                     NO
    
--     Use VA:                      NO
    
--     Use Intel VA-API/OpenCL:     NO
    
--     Use Eigen:                   NO
    
--     Use Cuda:                    NO
    
--     Use OpenCL:                  YES
    
--     Use custom HAL:              NO
    
-- 
    
--   OpenCL:
    
--     Version:                     dynamic
    
--     Include path:                /home/newdisk/opencv-3.1.0/3rdparty/include/opencl/1.2
    
--     Use AMDFFT:                  NO
    
--      Use AMDBLAS:                 NO
    
-- 
    
--   Python 2:
    
--     Interpreter:                 /usr/bin/python2.7 (ver 2.7.6)
    
-- 
    
--   Python 3:
    
--     Interpreter:                 /usr/bin/python3.4 (ver 3.4.3)
    
-- 
    
--   Python (for build):            /usr/bin/python2.7
    
-- 
    
--   Java:
    
--     ant:                         NO
    
--     JNI:                         NO
    
--     Java wrappers:               NO
    
--     Java tests:                  NO
    
-- 
    
--   Matlab:                        Matlab not found or implicitly disabled
    
-- 
    
--   Documentation:
    
--     Doxygen:                     NO
    
--     PlantUML:                    NO
    
-- 
    
--   Tests and samples:
    
--     Tests:                       YES
    
--     Performance tests:           YES
    
--     C/C++ Examples:              NO
    
-- 
    
--   Install path:                  /home/newdisk/opencv-3.1.0/BuildOpencv/install
    
-- 
    
--   cvconfig.h is in:              /home/newdisk/opencv-3.1.0/BuildOpencv
    
-- -----------------------------------------------------------------
    
-- 
    
-- Configuring done
    
-- Generating done
    
-- Build files have been written to: /home/newdisk/opencv-3.1.0/BuildOpencv
    
</filepath>

    After configuring and generating, run cmake-gui :

    lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo cmake-gui
    

    
Src:/home/newdisk/opencv-3.1.0
    
Build:/home/newdisk/opencv-3.1.0/BuildOpencv
    

    
CMAKE_INSTALL_PREFIX:/home/newdisk/optnew/opencv-arm
    

    
Don't choose these items:
    
WITH_CUDA
    
WITH_GTK
    
WITH_1394
    
WITH_GSTREAMER
    
WITH_LIBV4L 
    
WITH_TIFF
    
BUILD_OPENEXR
    
WITH_OPENEXR
    
WITH_OPENCL
    

    
Configure and generate.
    

    
lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo vi CMakeCache.txt
    
#CMakeCache.txt
    
//Flags used by the linker.
    
CMAKE_EXE_LINKER_FLAGS:STRING=-lpthread -lrt
    

    
lmk@lmk-virtual-machine:/home/newdisk/opencv-3.1.0/BuildOpencv$ sudo make

    Fianlly,I got these errors :

    [ 27%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_decoder.cpp.o
    
[ 27%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_v4l.cpp.o
    
[ 27%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o
    
In file included from /home/newdisk/opencv-3.1.0/modules/videoio/src/cap_ffmpeg_impl.hpp:65:0,
    
             from /home/newdisk/opencv-3.1.0/modules/videoio/src/cap_ffmpeg.cpp:45:
    
/home/newdisk/opencv-3.1.0/modules/videoio/src/ffmpeg_codecs.hpp:77:36: fatal error: libavformat/avformat.h: No such file or directory
    
compilation terminated.
    
make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o] Error 1
    
make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
    
make: *** [all] Error 2

    While the file libavformat/avformat.h does exits in my directory
    /home/newdisk/optnew/opencv-rely/include

    Why can cmake find lib directory

    -- Found ZLIB: /home/newdisk/optnew/opencv-rely/lib/libz.so (found suitable version "1.2.8", minimum required is "1.2.3")

    but cannot find include directory ?

    /home/newdisk/optnew/opencv-rely/include

    Do you have any idea ?

  • How to capture image from Imaging device using FFmpeg on Windows7

    8 juin 2017, par Amol

    I am trying to capture an image from Imaging device using FFmpeg command line tool on windows platform, but no way found to do this using FFmpeg.

    I am using following :

    • Version of FFmpeg : ffmpeg-3.3.1-win32-static
    • O/S : Windows7 32 bit
    • Imaging device : QP0204 USB

    Any help would be appreciated.

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