Recherche avancée

Sur d’autres sites (9102)

• How to stream rawvideo x11grab desktop with zero latency

  14 septembre 2017, par J. Unknwo

  I would like to stream my linux desktop with ffmpeg rawvideo
  i use this command on server :

  sudo ffmpeg -f x11grab -s 1280x720 -i :0.0 -vcodec rawvideo -pix_fmt bgr0 -threads 1 -f mpegts udp ://localhost:1234

  its take almost 900Mb/s bandwidth but its over LAN
  I dont wanna use codecs cause its create to big latency for playing games.

  But i cant use ffplay to recognize this stream

  ffplay ’udp ://localhost:1234 ?fifo_size=999000&overrun_nonfatal=1’

  I got error :
  Failed to open file ’udp ://localhost:1234 ?fifo_size=875000&overrun_nonfatal=1’ or configure filtergraph

  When i save to file after second i have large file but i can open it with vlc i cant open udp stream

  Edit2 :
  sudo ffplay -f rawvideo -pixel_format bgr0 -video_size 1280x720 udp ://localhost:1234 ?fifo_size=999000&overrun_nonfatal=1

  working but i have green artifacts everywhere

• Encoding RGB frames using x264 and AVCodec in C

  6 novembre 2016, par deepwork

  I have RGB24 frames streamed from camera and i want to encode them into h264 ,i found that AVCodec and x264 can do so, the problem is x264 as default accepts YUV420 as input so what i wrote was a program which convert RGB frames to YUV420 .that was by sws_scale function .this works well except that it does not satisfy the required FPS because the converting (RGB->YUV420) takes time.

  This is how i setup my encoder context :

  videoStream->id = 0;
  
  vCodecCtx = videoStream->codec;
  
  
  
  vCodecCtx->coder_type       = AVMEDIA_TYPE_VIDEO;
  
  vCodecCtx->codec_id         = AV_CODEC_ID_H264;
  
  vCodecCtx->bit_rate         = 400000;
  
  vCodecCtx->width            = Width;
  
  vCodecCtx->height           = Height;
  
  vCodecCtx->time_base.den    = FPS;
  
  vCodecCtx->time_base.num    = 1;
  
  //vCodecCtx->time_base      = (AVRational){1,};
  
  vCodecCtx->gop_size         = 12;
  
  vCodecCtx->max_b_frames     = 1;
  
  vCodecCtx->pix_fmt          = AV_PIX_FMT_YUV420P;
  
  
  
  if(formatCtx->oformat->flags & AVFMT_GLOBALHEADER)
  
      vCodecCtx->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  
  
  av_opt_set(vCodecCtx->priv_data, "preset", "ultrafast", 0);
  
  av_opt_set(vCodecCtx->priv_data, "profile", "baseline", AV_OPT_SEARCH_CHILDREN);
  
  
  
  if (avcodec_open2(vCodecCtx, h264Codec, NULL) < 0){
  
      return 0;
  
  }

  when i changes AV_PIX_FMT_YUV420P to AV_PIX_FMT_RGB24 ,avcodec_open2 will fail.
  i read that there is a version of libx264 for RGB called libx264rgb but i even dont know whether i have to rebuild x264 with enabling this option or to download another source or i have to do it programmatically with the first x264 lib.

  the question is how to enable RGB as input to libx264 to use with libavcodec in C .or how to make the encoding or sws_scale more fast .

  Edit :

  How i built ffmpeg :

  NDK=D:/AndroidDev/android-ndk-r9
  
  PLATFORM=$NDK/platforms/android-18/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64
  
  
  
  GENERAL="\
  
  --enable-small \
  
  --enable-cross-compile \
  
  --extra-libs="-lgcc" \
  
  --arch=arm \
  
  --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
  --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
  --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
  --extra-cflags="-I../x264/android/arm/include" \
  
  --extra-ldflags="-L../x264/android/arm/lib" "
  
  
  
  
  
  MODULES="\
  
  --enable-gpl \
  
  --enable-libx264"
  
  
  
  function build_ARMv6
  
  {
  
    ./configure \
  
    --target-os=linux \
  
    --prefix=./android/armeabi \
  
    ${GENERAL} \
  
    --sysroot=$PLATFORM \
  
    --enable-shared \
  
    --disable-static \
  
    --extra-cflags=" -O3 -fpic -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 -mfloat-abi=softfp -mfpu=vfp -marm -march=armv6" \
  
    --extra-ldflags="-lx264 -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
    --enable-zlib \
  
    ${MODULES} \
  
    --disable-doc \
  
    --enable-neon
  
  
  
    make clean
  
    make
  
    make install
  
  }
  
  
  
  build_ARMv6
  
  
  
  echo Android ARMEABI builds finished

  How i built x264 :

  NDK=D:/AndroidDev/android-ndk-r9
  
  PLATFORM=$NDK/platforms/android-18/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64
  
  PREFIX=./android/arm
  
  
  
  function build_one
  
  {
  
    ./configure \
  
    --prefix=$PREFIX \
  
    --enable-static \
  
    --enable-pic \
  
    --host=arm-linux \
  
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
    --sysroot=$PLATFORM
  
  
  
    make clean
  
    make
  
    make install
  
  }
  
  
  
  build_one
  
  
  
  echo Android ARM builds finished

• android nkd no include path in which to search for limits.h #include_next

  3 octobre 2018, par Yunga

  When i build the x264 ndk library , i face a problem .
  I’ve compiled both in window and liunx environment.i got the same mistakes...

  like this :

  In file included 
  
  from c:\users\xxx\appdata\local\android\sdk\ndk-bundle\toolchains\
  
  aarch64-linux-android-4.9\prebuilt\windows-x86_64\lib\gcc\aarch64-linux-android\4.9.x\include-fixed\syslimits.h:7:0,
  
  from c:\users\xxx\appdata\local\android\sdk\ndk-bundle\toolchains\
  
  aarch64-linux-android-4.9\prebuilt\windows-x86_64\lib\gcc\aarch64-linux-android\4.9.x\include-fixed\limits.h:34,
  
  from ./common/common.h:123,
  
  from ./x264cli.h:30,
  
  from ./input/input.h:31,
  
  from ./filters/video/video.h:29,
  
  from ./filters/video/depth.c:26:
  
  c:\users\xxx\appdata\local\android\sdk\ndk-bundle\toolchains\aarch64-linux-android-4.9\
  
  prebuilt\windows-x86_64\lib\gcc\aarch64-linux-android\4.9.x\include-fixed\limits.h:168:61: 
  
  error: no include path in which to search for limits.h
  
  #include_next   /* recurse down to the real one */
  
  
  
  make: *** [.depend] Error 1

  Here is my script :

  SYSROOT=$NDK/platforms/android-21/arch-arm64
  
  TOOLCHAIN=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/windows-x86_64
  
  CC=$TOOLCHAIN/bin/aarch64-linux-android-gcc-4.9.x
  
  #CXX=$TOOLCHAIN/bin/aarch64-linux-android-g++
  
  CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
  
  EXTRA_CFLAGS="-march=armv8-a -D__ANDROID__"
  
  EXTRA_LDFLAGS="-nostdlib"
  
  
  
  ./configure --prefix=$PREFIX \
  
          --host=arm-linux \
  
          --sysroot=$SYSROOT \
  
          --cross-prefix=$CROSS_PREFIX \
  
          --extra-cflags="$EXTRA_CFLAGS" \
  
          --extra-ldflags="$EXTRA_LDFLAGS" \
  
          --enable-pic \
  
          --enable-static \
  
          --enable-strip \
  
          --disable-cli \
  
          --disable-win32thread \
  
          --disable-avs \
  
          --disable-swscale \
  
          --disable-lavf \
  
          --disable-ffms \
  
          --disable-gpac \
  
          --disable-lsmash \
  
          --disable-asm \
  
          --disable-opencl

  does anyone know how to solve it ? thanks every much.