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• ffmpeg processing the live screen streaming has high latency

  27 février 2020, par Ant's

  I’m trying to do live screen sharing using ffmpeg using the following command :

  ffmpeg -f avfoundation -i "1:1" -c:v libx264 -threads 4 -preset ultrafast -c:a aac -ar 44100 -f flv rtmp://localhost/live/test

  Now I have a rtmp server, which receives the data and using flv.js, I’m showing the live stream video on the browser. The integration works perfectly fine, but the problem was the stream is getting delayed very much. There is a delay for say atleast 10s ; I’m not sure, whether we can make it less delay (more like instant screen share).

  Note : I’m using the Node RTMP server using https://github.com/illuspas/Node-Media-Server. The code for that is over here :

  const NodeMediaServer = require('node-media-server');
  
  
  
  const config = {
  
    rtmp: {
  
      port: 1935,
  
      chunk_size: 6000,
  
      gop_cache: true,
  
      ping: 30,
  
      ping_timeout: 60
  
    },
  
    http: {
  
      port: 8000,
  
      allow_origin: '*'
  
    }
  
  };
  
  
  
  var nms = new NodeMediaServer(config)
  
  nms.run();

  Any suggestions ? I’m on MacOS

• Revision 36982 : Certaines valeurs ne passent pas dans presets ... on améliore de ce coté ...

  6 avril 2010, par kent1@… — Log

  Certaines valeurs ne passent pas dans presets ... on améliore de ce coté là
  On affiche les boutons sous les documents même dans le cas d’un retour ajax

• Compile error for a simple library in Android using latest FFmpeg library with NDK

  21 mars 2017, par satyres

  I’m trying to get FFmpeg working in Android , and after successfuly compiled it on Ubuntu 64bit , and created the Android.mk under source/ffmpeg-3.4.2/android/arm folder and also the Android.mk in my own Android project
   ! i’m unable to compile a simple program and create the .so file !
  By the way i’ve searched over the net and in Stackoverflow for 2 days now without luck !
  here is the code Android.mk

  LOCAL_PATH:= $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := MyLibrary
  
  LOCAL_SRC_FILES := MyNativeFunctions.c
  
  LOCAL_LDLIBS := -lz -llog
  
  LOCAL_STATIC_LIBRARIES := libavformat_static libavcodec_static libavutil_static
  
  include $(BUILD_SHARED_LIBRARY)
  
  
  
  $(call import-module,ffmpeg-3.2.4/android/arm)

  The native functions

      #include <libavformat></libavformat>avformat.h>
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavutil></libavutil>avutil.h>
  
  
  
      #include <android></android>log.h>
  
      #define LOG_TAG "mylib"
  
      #define LOGI(...)  __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
  
      #define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
  
      jint Java_com_example_home_hellondk_MyNativeFunctions_TestNdk(JNIEnv * env, jobject this, jstring filename)
  
      {
  
           av_register_all();
  
  
  
  return 0;
  
  }

  when i use NDK-BUILD here is the error i got :

  /home/home/Android/Sdk/ndk-bundle/sources/ffmpeg-3.2.4/android/arm/lib/libavformat.a: error adding symbols: File in wrong format
  
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
  make: *** [obj/local/arm64-v8a/libMyLibrary.so] Error 1

  [EDIT]
  Build_android.sh

  #!/bin/bash
  
  NDK=/home/home/Android/Sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-24/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
   function build_one
  
  {
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --disable-shared \
  
  --enable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-avdevice \
  
  --disable-doc \
  
  --disable-symver \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  --extra-ldflags="$ADDI_LDFLAGS" \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  [EDIT]
  The problem has been solved by adding the missing library in
  LOCAL_STATIC_LIBRARIES := libavformat_static libavcodec_static libswscale_static libavutil_static libswresample_static
  and for all users of Android Studio do not forget to add this line to your gradle otherwise it won’t work.

  sourceSets.main {
  
          jni.srcDirs = []
  
          jniLibs.srcDir 'src/main/libs'
  
      }

  Best regards