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• undefined reference to 'memset' while configuring ffmpeg

  20 mai 2013, par Jacques Giraudel

  I want to port ffmpeg on android to use it in an app (to convert video files in webm format).

  I use the following command to configure FFMPEG :

  ./configure --target-os=linux \
  
      --cross-prefix=arm-linux-androideabi \
  
      --arch=arm-linux \
  
      --sysroot=$TC_SYSROOT \
  
      --nm=$NM \
  
      --ar=$AR \
  
      --cc=$CC \
  
      --ld=$LD \
  
      --disable-symver \
  
      --enable-small \
  
      --enable-libvorbis \
  
      --enable-libvpx \
  
      --extra-cflags="-I$PROJECT_BASE/jni/libvorbis/build/include -I$PROJECT_BASE/jni/libogg/build/include -I$PROJECT_BASE/jni/libvpx/libvpx -I$PROJECT_BASE/jni/libvpx/libvpx/build/install/include" \
  
      --extra-ldflags="-L$PROJECT_BASE/jni/libvorbis/build/lib -L$PROJECT_BASE/jni/libogg/build/lib -L$PROJECT_BASE/jni/libvpx/libvpx/build/install/lib" \
  
      --prefix=$PROJECT_BASE/jni/ffmpeg/build

  I use a standalone toolchain (NDK compiler version : 4.6). I dont use the AS of the toolchain, when I try the command block (I have waited for 10 minutes without response, some starting infos in the config.log and it seems to block at the beginning of the compilation). The different lib and directory added are the build install of the libraries needed (ogg, vorbis and vpx).

  I obtain this message :

   /Bureau/TripApp/jni/ffmpeg /Bureau/TripApp/jni /Bureau/TripApp/jni
  ERROR : libvpx decoder version must be >=0.9.1

  When I look at the config.log file, I have :

  check_lib2 vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_dec_init_ver -lvpx
  
  check_func_headers vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_dec_init_ver -lvpx
  
  check_ld cc -lvpx
  
  check_cc
  
  BEGIN /tmp/ffconf.TOBhIIiF.c
  
      1   #include <vpx></vpx>vpx_decoder.h>
  
      2   #include <vpx></vpx>vp8dx.h>
  
      3   long check_vpx_codec_dec_init_ver(void) { return (long) vpx_codec_dec_init_ver; }
  
      4   int main(void) { return 0; }
  
  END /tmp/ffconf.TOBhIIiF.c
  
  /home/jacques/my-android-toolchain2/bin/arm-linux-androideabi-gcc --sysroot=/home/jacques/my-android-toolchain2/sysroot -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -I/home/jacques/Bureau/TripApp/jni/libvorbis/build/include -I/home/jacques/Bureau/TripApp/jni/libogg/build/include -I/home/jacques/Bureau/TripApp/jni/libvpx/libvpx -I/home/jacques/Bureau/TripApp/jni/libvpx/libvpx/build/install/include -march=armv5te -std=c99 -fomit-frame-pointer -fPIC -marm -c -o /tmp/ffconf.bbOA0x5j.o /tmp/ffconf.TOBhIIiF.c
  
  /home/jacques/my-android-toolchain2/bin/arm-linux-androideabi-ld -L/home/jacques/Bureau/TripApp/jni/libvorbis/build/lib -L/home/jacques/Bureau/TripApp/jni/libogg/build/lib -L/home/jacques/Bureau/TripApp/jni/libvpx/libvpx/build/install/lib --sysroot=/home/jacques/my-android-toolchain2/sysroot -o /tmp/ffconf.IqRLz1B9 /tmp/ffconf.bbOA0x5j.o -lvpx -lvorbisenc -lvorbis -logg -lm -lz
  
  /home/jacques/my-android-toolchain2/bin/arm-linux-androideabi-ld: /home/jacques/Bureau/TripApp/jni/libvpx/libvpx/build/install/lib/libvpx.a(vpx_decoder.c.o): in function vpx_codec_dec_init_ver:(.text+0xc0): **error: undefined reference to &#39;memset&#39;**
  
  ERROR: libvpx decoder version must be >=0.9.1

  I have also a warning at the beginning of the file :

  WARNING: arm-linux-androideabipkg-config not found, library detection may fail.

  And many other errors which seem to be not blocking (eg : related to the support of older ARM version than the targeted one)

  libvpx is configured using the following command (the make succeeds) :

  ./libvpx/configure --target=armv5te-android-gcc --disable-examples \
  
                      --sdk-path=$NDK_BASE --prefix=$PROJECT_BASE/jni/libvpx/libvpx/build

  The NDK version used is r8e.

  My search on this :
  The libvpx version used is 1.1.0, memset is a function defined in string.h. String.h is present in the include dir of the sysroot used (and memset is defined).

  Do you see what could be the source of the problem ?

• My webcam works fine, while using cv2.Videocapture() but while trying to read from hard drive it shows error cap.isOpened() returns false, why ?

  27 septembre 2017, par Hu Yang

  import cv2
  video_capture = cv2.VideoCapture("rtsp ://admin:Trust1986_@10.58.94.47:554/h264/ch1/main/av_stream")
  video_capture.isOpened()

  False

  Other information below here, and ffmpeg I had installed.

    Video I/O:
  
      DC1394 1.x:                  NO
  
      DC1394 2.x:                  NO
  
      FFMPEG:                      NO
  
        avcodec:                   NO
  
        avformat:                  NO
  
        avutil:                    NO
  
        swscale:                   NO
  
        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/NO
  
      XIMEA:                       NO
  
      Xine:                        NO
  
      Intel Media SDK:             NO
  
      gPhoto2:                     NO
  
  
  
  root@ubuntu:/home/face_recognition/opencv/ffmpeg/ffmpeg-3.3.4# ffmpeg -version
  
  ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: 
  
  libavutil      55. 58.100 / 55. 58.100
  
  libavcodec     57. 89.100 / 57. 89.100
  
  libavformat    57. 71.100 / 57. 71.100
  
  libavdevice    57.  6.100 / 57.  6.100
  
  libavfilter     6. 82.100 /  6. 82.100
  
  libswscale      4.  6.100 /  4.  6.100
  
  libswresample   2.  7.100 /  2.  7.100
  
  root@ubuntu:/home/face_recognition/opencv/ffmpeg/ffmpeg-3.3.4# 
  
  root@ubuntu:/home/face_recognition/opencv/ffmpeg/ffmpeg-3.3.4# python3.6m -V
  
  Python 3.6.2
  
  root@ubuntu:/home/face_recognition/opencv/ffmpeg/ffmpeg-3.3.4# pkg-config --modversion opencv  
  
  3.3.0

  what shall I do next step ? Thanks.

• cinepakenc : fixes and improvements

  27 juin 2017, par addr-see-the-website@aetey.se

  cinepakenc : fixes and improvements
  version 2013-02-08 Rl
  
   fixes/optimization in multistrip encoding and codebook size choice,
  
    quality/bitrate is now better than that of the binary proprietary encoder
  version 2013-02-12 Rl
  
   separated codebook training sets, avoided the transfer of wasted bytes,
  
    which yields both better quality and smaller files
  
   now using the correct colorspace (TODO : move conversion to libswscale)
  version 2013-02-14 Rl "Valentine’s Day" version :
  
   made strip division more robust
  
   minimized bruteforcing the number of strips,
  
    (costs some R/D but speeds up compession a lot), the heuristic
  
    assumption is that score as a function of the number of strips has
  
    one wide minimum which moves slowly, of course not fully true
  
   simplified codebook generation,
  
    the old code was meant for other optimizations than we actually do
  
   optimized the codebook generation / error estimation for MODE_MC
  version 2013-04-28 Rl
  
   bugfixed codebook optimization logic
  version 2014-01-20 Rl
  
   made the encoder compatible with vintage decoders
  
    and added some yet unused code for possible future
  
    incremental codebook updates
  
   fixed a small memory leak
  version 2014-01-21 Rl
  
   believe it or not, now we get even smaller files, with better quality
  
    (which means I missed an optimization earlier :)
  Signed-off-by : Diego Biurrun <diego@biurrun.de>
  

  • [DBH] libavcodec/cinepakenc.c