Sur d’autres sites (9391)

• Error during the compilation of OpenCV with CUDA and FFMpeg on Ubuntu 18.04

  19 juillet 2019, par Karthik

  I have a requirement to install OpenCV compiled with CUDA and FFMpeg for an optical flow calculation.

  I followed this post to install on Ubuntu 18.04, but I am getting the following error shown in the below screenshot when I am trying to execute the following command :

    cmake -D CMAKE_BUILD_TYPE=RELEASE \
  
              -D CMAKE_INSTALL_PREFIX=/usr/local \
  
              -D INSTALL_C_EXAMPLES=ON \
  
              -D INSTALL_PYTHON_EXAMPLES=ON \
  
              -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
  
              -D BUILD_EXAMPLES=ON \
  
              -D BUILD_opencv_python2=OFF \
  
              -D WITH_FFMPEG=1 \
  
              -D WITH_CUDA=ON \
  
              -D CUDA_GENERATION=Pascal \
  
              -D ENABLE_FAST_MATH=1 \
  
              -D CUDA_FAST_MATH=1 \
  
              -D WITH_CUBLAS=1 \
  
              -D PYTHON_DEFAULT_EXECUTABLE=/opt/anaconda/bin/python \
  
              -D PYTHON3_INCLUDE_DIR=/opt/anaconda/include/python3.5m \
  
              -D PYTHON3_LIBRARY=/opt/anaconda/lib/libpython3.5m.so \
  
              -D PYTHON3_PACKAGES_PATH=/opt/anaconda/lib/python3.5 \
  
              -D WITH_LAPACK=OFF \
  
              -D PYTHON3_NUMPY_INCLUDE_DIRS=/opt/anaconda/lib/python3.5/site-packages/numpy/core/include ..

  

  I have installed the CUDA version 10.0

  It would be of a great help, if you can guide me to fix this error or suggest me a different procedure to install OpenCV compiled with CUDA and FFMpeg on Ubuntu 18.04.

  Thanks !

• How to enable LHLS in FFMPEG 4.1 ?

  27 décembre 2020, par mehdi.r

  I am trying to create a low latency CMAF video stream using FFMPEG.
To do so, I would like to enable the lhls option in FFMPEG in order to have the #EXT-X-PREFETCH tag written in the HLS manifest.

  



  From the FFMPEG doc :

  



  https://www.ffmpeg.org/ffmpeg-all.html

  



  


  Enable Low-latency HLS(LHLS). Adds #EXT-X-PREFETCH tag with current >segment’s URI. Apple doesn’t have an official spec for LHLS. Meanwhile >hls.js player folks are trying to standardize a open LHLS spec. The >draft spec is available in https://github.com/video-dev/hlsjs->rfcs/blob/lhls-spec/proposals/0001-lhls.md This option will also try >to comply with the above open spec, till Apple’s spec officially >supports it. Applicable only when streaming and hls_playlist options >are enabled. This is an experimental feature.

  


  



  I am using the following command with FFMPEG 4.1 :

  



  ffmpeg -re -i ~/Documents/videos/BigBuckBunny.mp4 \
    -map 0 -map 0 -map 0 -c:a aac -c:v libx264 -tune zerolatency \
    -b:v:0 2000k -s:v:0 1280x720 -profile:v:0 high \
    -b:v:1 1500k -s:v:1 640x340  -profile:v:1 main \
    -b:v:2 500k -s:v:2 320x170  -profile:v:2 baseline \
    -bf 1 \
    -keyint_min 24 -g 24 -sc_threshold 0 -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \
    -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" \
    -hls_playlist 1 -seg_duration 1 -streaming 1  -strict experimental -lhls 1 -remove_at_exit 1 \
    -f dash manifest.mpd



  



  The kind of HLS manifest I obtained for a specific resolution :

  



  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:1
#EXT-X-MEDIA-SEQUENCE:8
#EXT-X-MAP:URI="init-stream0.mp4"
#EXTINF:0.998458,
#EXT-X-PROGRAM-DATE-TIME:2019-06-21T18:13:56.966+0900
chunk-stream0-00008.mp4
#EXTINF:0.998458,
#EXT-X-PROGRAM-DATE-TIME:2019-06-21T18:13:57.964+0900
chunk-stream0-00009.mp4
#EXTINF:0.998458,
#EXT-X-PROGRAM-DATE-TIME:2019-06-21T18:13:58.963+0900
chunk-stream0-00010.mp4
#EXTINF:0.998458,
#EXT-X-PROGRAM-DATE-TIME:2019-06-21T18:13:59.961+0900
chunk-stream0-00011.mp4
#EXTINF:1.021678,
#EXT-X-PROGRAM-DATE-TIME:2019-06-21T18:14:00.960+0900
chunk-stream0-00012.mp4
...



  



  As you can see the #EXT-X-PREFETCH tag is missing.

  



  Any help would be highly appreciated.

  



  Edit

  



  I also compiled FFmpeg from its master branch by doing the following :

  



  nasm

  



  sudo apt-get install nasm mingw-w64


  



  Codecs

  



  sudo apt-get install libx265-dev libnuma-dev libx264-dev libvpx-dev libfdk-aac-dev libmp3lame-dev libopus-dev


  



  FFmpeg

  



  mkdir lhls
cd lhls 
git init 
git clone https://github.com/FFmpeg/FFmpeg.git
cd FFmpeg 
git checkout master


  



  AOM (inside FFmpeg dir)

  



  git -C aom pull 2> /dev/null || git clone --depth 1 https://aomedia.googlesource.com/aom && \
mkdir -p aom_build && \
cd aom_build && \
PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED=off -DENABLE_NASM=on ../aom && \
PATH="$HOME/bin:$PATH" make && \
make install
cd..


  



  Compiling

  



  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="$HOME/bin" \
  --enable-gpl \
  --enable-libaom \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265 \
  --enable-nonfree && \
PATH="$HOME/bin:$PATH" make 


  



  Unfortunately, the #EXT-X-PREFETCH is still missing in the HLS Manifest.

  



  I also tried nightly builds from https://ffmpeg.zeranoe.com/builds/ , same result.

  



  Any help would be highly appreciated.

  



  EDIT 2 :resolved

  



  Thanks to @aergistal and @Gyan , the #EXT-X-PREFETCH tag is now present in my HLS manifest.

  



  Here the FFMPEG command I am using :

  



  ./ffmpeg -re -i ~/videos/BigBuckBunny.mp4 -loglevel debug \
  -map 0 -map 0 -map 0 -c:a aac -c:v libx264 -tune zerolatency \
  -b:v:0 2000k -s:v:0 1280x720 -profile:v:0 high -b:v:1 1500k -s:v:1 640x340  -profile:v:1 main -b:v:2 500k -s:v:2 320x170  -profile:v:2 baseline -bf 1 \
 -keyint_min 24 -g 24 -sc_threshold 0 -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 -window_size 5 \
 -adaptation_sets "id=0,streams=v id=1,streams=a" -hls_playlist 1 -seg_duration 3 -streaming 1 \
 -strict experimental -lhls 1 -remove_at_exit 0 -master_m3u8_publish_rate 3 \
 -f dash -method PUT -http_persistent 1  https://example.com/manifest.mpd


  



  Apparently the mime types are not passed to the server & FFmpeg seems to ignore the -headers option.

  


• FLAC now depends on win_utf8_io

  14 avril 2019, par Vitaliy Kirsanov

  FLAC now depends on win_utf8_io
  Accidently found this missing dependency
  

  • [DH] CMakeLists.txt
  • [DH] examples/cpp/decode/file/CMakeLists.txt
  • [DH] examples/cpp/encode/file/CMakeLists.txt
  • [DH] src/libFLAC++/CMakeLists.txt
  • [DH] src/libFLAC/CMakeLists.txt
  • [DH] src/share/grabbag/CMakeLists.txt
  • [DH] src/test_libFLAC++/CMakeLists.txt
  • [DH] src/utils/flacdiff/CMakeLists.txt
  • [DH] src/utils/flactimer/CMakeLists.txt