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• encoding video with HEVC codec in opencv (ffmpeg)

  8 décembre 2020, par 404pio

  I have read documentation(https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu and https://docs.opencv.org/master/d2/de6/tutorial_py_setup_in_ubuntu.html) about opencv and ffmpeg, so I have compiled both parts. And when I call :

  


  import cv2
writer = cv2.VideoWriter('test.mkv', cv2.VideoWriter_fourcc(*'HEVC'), 30, (1080, 1920))


  


  or

  


  import cv2
writer = cv2.VideoWriter('test.mp4', cv2.VideoWriter_fourcc(*'HEVC'), 30, (1080, 1920))


  


  I'm getting following error OpenCV: FFMPEG: tag 0x43564548/'HEVC' is not found (format 'mp4 / MP4 (MPEG-4 Part 14)')'. What is interesting, it works with h264 codec, previous version without compiling doesn't support h264. Do I have problem with ffmpeg or opencv ?

  


  I have docker image as follows :

  


  FROM ubuntu:18.04
ENV DEBIAN_FRONTEND noninteractive

RUN apt-get update -y --fix-missing && \
    apt-get install -y  git cmake gcc g++ build-essential curl \
                        vim wget unzip yasm python3-dev \
                        python3-numpy libavcodec-dev libavformat-dev \
                        libswscale-dev libpng-dev libjpeg-dev libwebp-dev && \
    rm -rf /var/lib/apt/lists/*

# compile ffmpeg
RUN apt-get install -y  autoconf automake build-essential cmake \
                        git-core libass-dev libfreetype6-dev \
                        libgnutls28-dev libsdl2-dev libtool \
                        libunistring-dev libva-dev libvdpau-dev \
                        libvorbis-dev libxcb1-dev \
                        libxcb-shm0-dev libxcb-xfixes0-dev \
                        pkg-config texinfo wget yasm \
                        zlib1g-dev libx264-dev libx265-dev libnuma-dev && \
    mkdir -p ~/ffmpeg_sources && \
    cd ~/ffmpeg_sources && \
    git -C x265_git pull 2> /dev/null || git clone --depth 1 https://bitbucket.org/multicoreware/x265_git && \
    cd x265_git/build/linux && \
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED=off ../../source && \
    make && \
    make install && \
    cd ~/ffmpeg_sources && \
    wget -q -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
    tar xjf ffmpeg-snapshot.tar.bz2 && \
    cd ffmpeg && \
    PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
      --prefix="$HOME/ffmpeg_build" \
      --pkg-config-flags="--static" \
      --extra-cflags="-I$HOME/ffmpeg_build/include" \
      --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
      --extra-libs="-lpthread -lm" \
      --bindir="/usr/local/bin" \
      --enable-gpl \
      --enable-gnutls \
      --enable-libass \
      --enable-libfreetype \
      --enable-libvorbis \
      --enable-libx264 \
      --enable-libx265 \
      --enable-nonfree && \
    PATH="$HOME/bin:$PATH" make && \
    make install && \
    hash -r && \
    rm -rf /var/lib/apt/lists/*

# compile opencv
RUN mkdir -p ~/opencv_sources && \
    git clone --depth 1 --branch 4.5.0 https://github.com/opencv/opencv.git ~/opencv_sources && \
    mkdir -p ~/opencv_sources/build && cd ~/opencv_sources/build && \
    cmake -D WITH_FFMPEG=ON ../ &&
    make && make install


  


• Libsourcey : Segmentation fault

  12 décembre 2018, par Iranna Pattar

  I am running WebRTC Native Video Recorder demo Application,but getting Segmentation fault (core dumped).

  here is the cmake command :

  cmake .. -DCMAKE_BUILD_TYPE=DEBUG -DBUILD_SHARED_LIBS=OFF     -DBUILD_MODULES=OFF    -DBUILD_APPLICATIONS=OFF \
  
     -DBUILD_SAMPLES=ON         -DBUILD_TESTS=OFF         -DWITH_WEBRTC=ON -DWITH_FFMPEG=ON    -DBUILD_MODULE_base=ON \
  
     -DBUILD_MODULE_crypto=ON   -DBUILD_MODULE_http=ON       -DBUILD_MODULE_json=ON               -DBUILD_MODULE_av=ON    \
  
     -DBUILD_MODULE_net=ON      -DBUILD_MODULE_socketio=ON   -DBUILD_MODULE_symple=ON             -DBUILD_MODULE_stun=ON   \
  
     -DBUILD_MODULE_turn=ON     -DBUILD_MODULE_util=ON       -DBUILD_MODULE_uv=ON                 -DBUILD_MODULE_webrtc=ON \
  
     -DBUILD_SAMPLES_webrtc=ON  -DWEBRTC_INCLUDE_DIR=/home/ubuntu/temp/webrtc-22215-ab42706-linux-x64/include \
  
     -DWEBRTC_LIBRARIES=/home/ubuntu/temp/webrtc-22215-ab42706-linux-x64/lib/ \
  
     -DWEBRTC_ROOT_DIR=/home/ubuntu/temp/webrtc-22215-ab42706-linux-x64    \
  
     -DBUILD_MODULE_openssl=ON   -DOPENSSL_ROOT_DIR=/usr/local/ssl     -DOPENSSL_LIBRARIES=/usr/local/ssl/lib/ \
  
     -DOPENSSL_INCLUDE_DIR=/usr/local/ssl/include/openssl/

  and Resolution is 640*480 , bit rate 128000, profile level is 3.2 .

  [libx264 @ 0x7f63dc001600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 LZCNT BMI1
  
  [libx264 @ 0x7f63dc001600] profile High, level 3.2
  
  Segmentation fault (core dumped)

  I have tried to track with gdb and backtrace but couldnt find

  [libx264 @ 0x7fffa4001600] profile High, level 3.2
  
  
  
  Thread 19 "IncomingVideoSt" received signal SIGSEGV, Segmentation fault.
  
  [Switching to Thread 0x7fffd76fd700 (LWP 21381)]
  
  0x00000001000001e0 in ?? ()
  
       bt
  
  #0  0x00000001000001e0 in ?? ()
  
  #1  0x00007ffff5380c6c in x264_stack_align () from /usr/lib/x86_64-linux-gnu/libx264.so.155
  
  #2  0x00007fffd76f710c in ?? ()
  
  #3  0x00007fffd76f7110 in ?? ()
  
  #4  0x0000000000000000 in ?? ()

  How to resolve this error ?

• Libsourcey : Segmentation fault

  12 décembre 2018, par Iranna Pattar

  I am running WebRTC Native Video Recorder demo Application,but getting Segmentation fault (core dumped).

  here is the cmake command :

  cmake .. -DCMAKE_BUILD_TYPE=DEBUG -DBUILD_SHARED_LIBS=OFF     -DBUILD_MODULES=OFF    -DBUILD_APPLICATIONS=OFF \
  
     -DBUILD_SAMPLES=ON         -DBUILD_TESTS=OFF         -DWITH_WEBRTC=ON -DWITH_FFMPEG=ON    -DBUILD_MODULE_base=ON \
  
     -DBUILD_MODULE_crypto=ON   -DBUILD_MODULE_http=ON       -DBUILD_MODULE_json=ON               -DBUILD_MODULE_av=ON    \
  
     -DBUILD_MODULE_net=ON      -DBUILD_MODULE_socketio=ON   -DBUILD_MODULE_symple=ON             -DBUILD_MODULE_stun=ON   \
  
     -DBUILD_MODULE_turn=ON     -DBUILD_MODULE_util=ON       -DBUILD_MODULE_uv=ON                 -DBUILD_MODULE_webrtc=ON \
  
     -DBUILD_SAMPLES_webrtc=ON  -DWEBRTC_INCLUDE_DIR=/home/ubuntu/temp/webrtc-22215-ab42706-linux-x64/include \
  
     -DWEBRTC_LIBRARIES=/home/ubuntu/temp/webrtc-22215-ab42706-linux-x64/lib/ \
  
     -DWEBRTC_ROOT_DIR=/home/ubuntu/temp/webrtc-22215-ab42706-linux-x64    \
  
     -DBUILD_MODULE_openssl=ON   -DOPENSSL_ROOT_DIR=/usr/local/ssl     -DOPENSSL_LIBRARIES=/usr/local/ssl/lib/ \
  
     -DOPENSSL_INCLUDE_DIR=/usr/local/ssl/include/openssl/

  and Resolution is 640*480 , bit rate 128000, profile level is 3.2 .

  [libx264 @ 0x7f63dc001600] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 LZCNT BMI1
  
  [libx264 @ 0x7f63dc001600] profile High, level 3.2
  
  Segmentation fault (core dumped)

  I have tried to track with gdb and backtrace but couldnt find

  [libx264 @ 0x7fffa4001600] profile High, level 3.2
  
  
  
  Thread 19 "IncomingVideoSt" received signal SIGSEGV, Segmentation fault.
  
  [Switching to Thread 0x7fffd76fd700 (LWP 21381)]
  
  0x00000001000001e0 in ?? ()
  
       bt
  
  #0  0x00000001000001e0 in ?? ()
  
  #1  0x00007ffff5380c6c in x264_stack_align () from /usr/lib/x86_64-linux-gnu/libx264.so.155
  
  #2  0x00007fffd76f710c in ?? ()
  
  #3  0x00007fffd76f7110 in ?? ()
  
  #4  0x0000000000000000 in ?? ()

  How to resolve this error ?