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• 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

• ffmpeg bitrate/quality selection

  18 octobre 2020, par user209405

  I'm attempting to copy videos from a site. They are stored in 6 different resolutions, as an hls stream format. When I use the command ffmpeg -i http://c.brightcove.com/services/mobile/streaming/index/master.m3u8?videoId=5506754630001 -c copy output.ts I get the highest quality (1280x720). However, when I wget the .m3u8 I can see there are other qualities but am having trouble with how to copy those quality (i.e. 640x380). the original link is http://www.sportsnet.ca/hockey/nhl/analyzing-five-potential-trade-destinations-matt-duchene/.

  



  I'm hoping someone can help me out with this. Thank you.

  


• Build FFMPEG with x264 for Android

  26 mai 2023, par Kage

  I am trying to build FFMPEG with libx264 for Android.

  



  I can successfully build and use FFMPEG for Android but I realized that I need the ability to encode, therefore I am trying to build FFMPEG with x264.

  



  I am using this tutorial to build FFmpeg for Android http://www.roman10.net/how-to-build-ffmpeg-for-android/

  



  When trying to build FFMPEG I get an error :

  



  


  "ERROR : libx264 not found"

  


  



  And in my log it says :

  



  


  "/usr/local/lib/libx264.a : could not read symbols : Archive has no
 index ; run ranlib to add one..."

  


  



  I have the latest versions of both FFMPEG and x264.
I understand that FFMPEG looks for the header and libraries in usr/lib and usr/include, so in order to make it find x264 I use the cflags and ldflags :

  



  

  • —extra-cflags = " -I/usr/local/include "

  


  • —extra-ldflags = " -L/usr/local/lib "

  


  



  I have tried building x264 with many different options that other people on the internet have said that i need. eg. —enable-shared, —enable-static, —disable-pthreads etc.
Some forums say enable this, others say no disable that.

  



  Any help would be much appreciated,
Thanks

  



  EDIT :

  



  If I build FFmpeg with the simplest commands to include libx264 then it works.
ie.

  



  ./configure --enable-gpl --enable-libx264 --extra-cflags="-I/usr/local/include" --extra-ldflags="-L/usr/local/lib" --enable-static --enable-shared


  



  However I need it to work for Android. The script I am using is :

  



  NDK=~/Desktop/android-ndk-r7
PLATFORM=$NDK/platforms/android-8/arch-arm/
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86
function build_one
{
./configure --target-os=linux \
    --prefix=$PREFIX \
    --enable-cross-compile \
    --enable-shared \
    --enable-static \
    --extra-libs="-lgcc" \
    --arch=arm \
    --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
    --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
    --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
    --sysroot=$PLATFORM \
    --extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS -I/usr/local/include" \
    --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L $PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog -L/usr/local/lib " \
    --enable-gpl \
    --enable-libx264 \
    --disable-everything \
    --enable-demuxer=mov \
    --enable-demuxer=h264 \
    --disable-ffplay \
    --enable-protocol=file \
    --enable-avformat \
    --enable-avcodec \
    --enable-decoder=rawvideo \
    --enable-decoder=mjpeg \
    --enable-decoder=h263 \
    --enable-decoder=mpeg4 \
    --enable-decoder=h264 \
    --enable-encoder=mjpeg \
    --enable-encoder=h263 \
    --enable-encoder=mpeg4 \
    --enable-encoder=h264 \
    --enable-parser=h264 \
    --disable-network \
    --enable-zlib \
    --disable-avfilter \
    --disable-avdevice \
    $ADDITIONAL_CONFIGURE_FLAG

make clean
make  -j4 install
$PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
$PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
}

CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=
build_one


  



  I am guessing that some option in my configure command is conflicting with enabling libx264

  



  NOTE : If I remove —enable-libx264 then it works