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• FFMpeg v4l2m2m green output

  16 avril 2020, par Roman Honcharenko

  I'm using hardware encoding via FFMPEG and h264_v4l2m2m codec.

  



  If I'm using FFmpeg h264_v4l2m2m, the encoded video looks like this

  



  ffmpeg -i small.mp4 -vcodec h264_v4l2m2m grb_2-v4l2.avi

[h264_v4l2m2m @ 0x13d24d0] driver 'bcm2835-codec' on card 'bcm2835-codec-isp'
[h264_v4l2m2m @ 0x13d24d0] driver 'bcm2835-codec' on card 'bcm2835-codec-encode'
[h264_v4l2m2m @ 0x13d24d0] Using device /dev/video11
[h264_v4l2m2m @ 0x13d24d0] driver 'bcm2835-codec' on card 'bcm2835-codec-encode'
[h264_v4l2m2m @ 0x13d24d0] Failed to set number of B-frames
    Last message repeated 1 times
[h264_v4l2m2m @ 0x13d24d0] Failed to set header mode
[h264_v4l2m2m @ 0x13d24d0] Failed to set gop size
[h264_v4l2m2m @ 0x13d24d0] h264 profile not found
[h264_v4l2m2m @ 0x13d24d0] Encoder adjusted: qmin (0), qmax (51)
[h264_v4l2m2m @ 0x13d24d0] Failed to set minimum video quantizer scale
[h264_v4l2m2m @ 0x13d24d0] Failed to set maximum video quantizer scale


  



  And while processing :

  



  [avi @ 0x145aa20] Non-monotonous DTS in output stream 0:0; previous: 0, current: 0; changing 
to 1. This may result in incorrect timestamps in the output file.


  



  If the video container is not AVI, then the resulting video is blank.

  



  I want to use this encoder as a backend codec for OpenCV. If I'm trying to use it, I'm getting the following error :

  



  This encoder requires using the avcodec_send_frame() API


  



  What is the workaround and where should I look ?

  



  

  • Machine : Raspberry Pi 4B+

  


  • System : Custom Yocto Distribution (master branches)

  


  • OpenCV version : 4.1.0

  


  • FFMpeg version : 4.2.2

  


  


• FFmpeg cross compile for Android fails with on C compiler test for x86_64

  5 novembre 2018, par nLL

  I am trying to cross compile FFmpeg for Android with NDK r16b
  I have manged to compile without any issues for all platforms but x86_64.

  Here is my compile script

          #!/bin/bash
  
  
  
  
  
  
  
      function build_one
  
      {
  
      ./configure \
  
      --prefix=$PREFIX \
  
      --enable-shared \
  
      --disable-static \
  
      --enable-pic \
  
      --enable-small \
  
      --disable-programs \
  
      --disable-symver \
  
      --target-os=android \
  
      --enable-cross-compile \
  
      --cross-prefix=$CROSS_PREFIX \
  
      --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
      --extra-ldflags="$ADDI_LDFLAGS" \
  
      --sysroot=$TOOLCHAIN/sysroot $ADDITIONAL_CONFIG_FLAG \
  
      --disable-all --disable-autodetect --disable-network --enable-pthreads \
  
      --enable-protocol=file --enable-protocol=pipe --enable-protocol=concat \
  
      --disable-all --disable-autodetect --disable-network --enable-pthreads \
  
      --enable-avcodec --enable-avformat --enable-swresample --enable-avfilter --enable-filter=aresample \
  
      --enable-parser=aac --enable-parser=aac_latm --enable-parser=flac --enable-parser=mpegaudio --enable-parser=vorbis \
  
      --enable-muxer=mp3,wav --enable-encoder=pcm*,libmp3lame --enable-nonfree --enable-gpl \
  
      --enable-jni --enable-mediacodec --enable-libmp3lame
  
  
  
  
  
      make -j4
  
      make install
  
      make distclean
  
      }
  
  
  
      HOME_PATH=/home/nll/Desktop
  
      CPU=x86_64
  
      TOOLCHAIN=$HOME_PATH/my_toolchains/x86_64
  
      CROSS_PREFIX=$TOOLCHAIN/bin/x86_64-linux-android-
  
      mkdir -p $(pwd)/android/$CPU
  
      PREFIX=$(pwd)/android/$CPU
  
      ADDI_CFLAGS="-march=x86-64 -I$INCLUDE_PATH"
  
      ADDI_LDFLAGS="-shared -L$LIBS_PATH"
  
      ADDITIONAL_CONFIG_FLAG="--arch=x86_64 --enable-x86asm"
  
      build_one

  Above script fails with

          WARNING: /home/nll/Desktop/my_toolchains/x86_64/bin/x86_64-linux-android-pkg-config not found, library detection may fail.
  
      mktemp -u XXXXXX
  
      5ZpQya
  
      test_ld cc
  
      test_cc
  
      BEGIN /tmp/ffconf.KWqViHoN/test.c
  
          1   int main(void){ return 0; }
  
      END /tmp/ffconf.KWqViHoN/test.c
  
      /home/nll/Desktop/my_toolchains/x86_64/bin/x86_64-linux-android-gcc --sysroot=/home/nll/Desktop/my_toolchains/x86_64/sysroot -Os -fpic -march=x86-64 -I -c -o /tmp/ffconf.KWqViHoN/test.o /tmp/ffconf.KWqViHoN/test.c
  
      /home/nll/Desktop/my_toolchains/x86_64/bin/x86_64-linux-android-gcc -shared -L --sysroot=/home/nll/Desktop/my_toolchains/x86_64/sysroot -o /tmp/ffconf.KWqViHoN/test /tmp/ffconf.KWqViHoN/test.o
  
      /home/nll/Desktop/my_toolchains/x86_64/bin/../lib/gcc/x86_64-linux-android/4.9.x/../../../../x86_64-linux-android/bin/ld: error: /tmp/ffconf.KWqViHoN/test.o: unsupported ELF file type 2
  
      collect2: error: ld returned 1 exit status
  
      C compiler test failed.

  So, error is "unsupported ELF file type 2" which means 64 bit. But, I am trying to build 64 bit library anyway.

  I do not understand what is the issue here. Can anyone give me some direction ?

• Evolution #3865 (En cours) : URL ressources + compression CSS -> Cross-Origin Request Blocked

  24 novembre 2016, par denis -

  En ajoutant une URL ressouces, l’affichage des police ne fonctionne plus. Firebug me dit "Cross-Origin Request Blocked : The Same Origin Policy disallows reading the remote resource at http://medias.nova-cinema.org/squelettes/css/font-osp-din/osp-din-webfont.woff. (Reason : CORS header ’Access-Control-Allow-Origin’ missing)."

  Le problème se règle en rajoutant Header set Access-Control-Allow-Origin "*" dans le .htaccess comme indiqué ici http://connect.adfab.fr/developpement-front/utiliser-tous-les-verbes-http-avec-cors