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• How to open .mp4 file using JavaCV's FFmpegGrabber in Android ?

  20 août 2015, par 7bitex

  I’m using JavaCV’s FFmpegFrameGrabber to open an mp4 file and grab frames for processing later. The mp4 file is chosen with an ACTION_GET_CONTENT intent which returns a file URI. Here is my code :

  FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(mFileUri.getPath());
  
  grabber.setFormat("mp4");
  
  
  
  AndroidFrameConverter converter = new AndroidFrameConverter();
  
  try {
  
      grabber.start();
  
      Frame frame;
  
      while ((frame = grabber.grabFrame()) != null) {
  
          mImageResult.setImageBitmap(converter.convert(frame));
  
      }
  
  
  
      grabber.stop();
  
  } catch (FrameGrabber.Exception ex) {
  
      Log.e("Detector", ex.getLocalizedMessage());
  
  }

  But an error occurs saying avformat_open_input() error -13: Could not open input "/storage/emulated/0/DCIM/Camera/VID_20150820_152542.mp4". (Has setFormat() been called?). So where is wrong with my code ?

• Unable to open mp4 video file with VideoCapture with OpenCV 3.0 before and after recompiling with ffmpeg

  19 août 2015, par ricardo_8990

  When running

  VideoCapture cap;
  
  cap.open("GOPR3252.mp4");
  
  
  
  if(!cap.isOpened())
  
  {
  
      return -1;
  
  }

  I couldn’t open the video, even though I tried to manually add the codec CV_FOURCC(’A’, ’V’, ’C’, ’1’). I read that this may be due to the link with ffmpeg. So I compiled and installed ffmpeg using this guide and this one.

  Later, I uninstalled OpenCV, downloaded and compiled using CMake as :

  cmake -D CMAKE_SHARED_LINKER_FLAGS=-Wl,-Bsymbolic -D WITH_FFMPEG=ON -D WITH_QT=ON -D BUILD_EXAMPLES=ON CMAKE_BUILD_TYPE=Release /route_to_software/opencv/

  However, all the time I get this in the resume at the video section :

  --   Video I/O:
  
  --     DC1394 1.x:                  NO
  
  --     DC1394 2.x:                  NO
  
  --     FFMPEG:                      NO
  
  --       codec:                     NO
  
  --       format:                    NO
  
  --       util:                      NO
  
  --       swscale:                   NO
  
  --       resample:                  NO
  
  --       gentoo-style:              NO
  
  --     GStreamer:                   NO
  
  --     OpenNI:                      NO
  
  --     OpenNI PrimeSensor Modules:  NO
  
  --     OpenNI2:                     NO
  
  --     PvAPI:                       NO
  
  --     GigEVisionSDK:               NO
  
  --     UniCap:                      NO
  
  --     UniCap ucil:                 NO
  
  --     V4L/V4L2:                    NO/YES
  
  --     XIMEA:                       NO
  
  --     Xine:                        NO
  
  --     gPhoto2:                     NO
  
  --

  I have no problem making and installing OpenCV, but I still can’t open that video.

  Then, I tried to convert the video from mp4 to avi and got this error when reading the video file :

  Unexpected list type. Expected : hdrl. Got : movi.

  I tried with different formats as 3gp, wmv with any luck.

  I am running out of ideas. Any clue what I am doing wrong ?

  EDIT
  After uninstalling again ffmpeg and OpenCV. Then I installed ffmpeg from the packman repositories with libffmpeg-dev, compile and install OpenCV. I can play the video in the avi format but I still get this message :

  Unexpected list type. Expected : hdrl. Got : movi.

  I am using OpenSUSE 13.2

  Thanks in advance,

• ffmpeg x11grab Fedora 22 cannot open display [on hold]

  4 août 2015, par voor

  Running a fairly recent version of Fedora 22 :

  Linux localhost 4.1.3-200.fc22.x86_64 #1 SMP Wed Jul 22 19:51:58 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  Dual screen Acer XB270HU and AOC 2369. Also uses NVIDIA Drivers :

  ➜  ~  rpm -qa | grep nvidia
  
  nvidia-driver-libs-352.30-1.fc22.x86_64
  
  nvidia-driver-352.30-1.fc22.x86_64
  
  nvidia-settings-352.30-1.fc22.x86_64
  
  nvidia-libXNVCtrl-352.30-1.fc22.x86_64
  
  dkms-nvidia-352.30-1.fc22.x86_64
  
  nvidia-driver-libs-352.30-1.fc22.i686

  Whenever I attempt to do a x11grab in ffmpeg I get an error :

  ➜  ~  ffmpeg -f x11grab -r 15 -s 1920x1080 -i :0 -vcodec h264 -crf 30 -y output.mp4
  
  ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.1.1 (GCC) 20150422 (Red Hat 5.1.1-1)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Invalid MIT-MAGIC-COOKIE-1 key[x11grab @ 0x1fe1d40] Cannot open display :0, error 1.
  
  :0: Input/output error

  I’ve tried a few different commands basically copy/pasta from the web on how to do screengrabs. I don’t need audio, just video, and all of them result in the same error.

  I am able to do xwininfo without any problems :

  ➜  ~  xwininfo    
  
  
  
  xwininfo: Please select the window about which you
  
            would like information by clicking the
  
            mouse in that window.
  
  
  
  xwininfo: Window id: 0x1e0006c "linux - ffmpeg x11grab Fedora 22 cannot open display - Stack Overflow - Google Chrome"
  
  
  
    Absolute upper-left X:  0
  
    Absolute upper-left Y:  27
  
    Relative upper-left X:  0
  
    Relative upper-left Y:  27
  
    Width: 2560
  
    Height: 1413
  
    Depth: 24
  
    Visual: 0x21
  
    Visual Class: TrueColor
  
    Border width: 0
  
    Class: InputOutput
  
    Colormap: 0x20 (installed)
  
    Bit Gravity State: ForgetGravity
  
    Window Gravity State: NorthWestGravity
  
    Backing Store State: NotUseful
  
    Save Under State: no
  
    Map State: IsViewable
  
    Override Redirect State: no
  
    Corners:  +0+27  -1920+27  -1920-0  0
  
    -geometry 2560x14130