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• ffmpeg android porting help me

  13 février 2018, par Mr.Han

  My development environment is Windows10 - 64bit .
  It is set to Android development environment
  I am trying to compile ffmpeg.
  I installed cygwin and installed cygwin.
  gcc related all, dos2unix, make, automake.
  ffmpeg version is 3-2.10.

  1. configure file
     Before

     SLIBNAME_WITH_MAJOR=’$(SLIBNAME).$(LIBMAJOR)’
     LIB_INSTALL_EXTRA_CMD=’$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"’
     SLIB_INSTALL_NAME=’$(SLIBNAME_WITH_VERSION)’
     SLIB_INSTALL_LINKS=’$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)’

  After

  SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME)'

  2. build_android.sh

      !/bin/bash

     NDK=c :/Users/storm/AppData/Local/Android/Sdk/ndk-bundle
     SYSROOT=$NDK/platforms/android-16/arch-arm/
     TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
     CUR=cygpath -m $(pwd)
     TEMPDIR=cygpath -m /tmp
     TMP=cygpath -m /tmp
     function build_one
     
     sed -i ’s/ln_s="ln -s -f"/ln_s="cp -f"/g’ ./configure
     ./configure \
     — prefix=$PREFIX \
     — enable-shared \
     — disable-static \
     — disable-doc \
     — disable-ffmpeg \
     — disable-ffplay \
     — disable-ffprobe \
     — disable-ffserver \
     — disable-avdevice \
     — disable-doc\
     — disable-symver \
     — cross-prefix=$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"\
     $ADDITIONAL_CONFIGURE_FLAG
     sed -i’:a ;N ;$ !ba ;s/gcc 4.9\r/gcc 4.9/g’ ./config.h
     sed -i’:a ;N ;$ !ba ;s/gcc 4.9\r/gcc 4.9/g’ ./config.mak

     make clean

     make

     make install

     
     CPU=arm
     PREFIX=$CUR/android/$CPU
     ADDI_CFLAGS="-marm"
     build_one

  Where is the problem ?
  Please help me.

• Audio effect ( a 20ms delay between right and the left channel) using Web Audio API or any Javascript Audio Library like howler.js, tone.js ?

  15 juillet 2020, par questionare_101

  I was wondering if there any option in howler.js, tone.js or any other javascript audio library which I can use to add a 20ms delay between the right and the left channel which makes the audio listening experience more immersive.

  


  Can it be achieved using Audio sprites with howler.js ? (but I guess it can't separate the right and the left channels)
https://medium.com/game-development-stuff/how-to-create-audiosprites-to-use-with-howler-js-beed5d006ac1

  


  Is there any ?

  


  Have also asked the same quest here : https://github.com/goldfire/howler.js/issues/1374

  


  I usually enable this option under ffdshow audio processor while playing audio using MPC-HC (Mega Version) on my pc. I was wondering how can I do it using Web Audio API or howler.js ?

  


  

  


  Somewhat like this kind of effect : Just delay the either channel by 20ms
Like we do in Adobe Audition


  


• How to compile ffmpeg on Windows 10 ?

  13 février 2018, par Mr.Han

  My development environment is Windows 10 - 64bit. It is set to Android development environment. I am trying to compile ffmpeg.

  I installed cygwin and installed cygwin. gcc related all, dos2unix, make, automake. ffmpeg version is 3-2.10.

  Configure file

  Before

  SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

  After

  SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME)'

  build_android.sh

  #!/bin/bash
  
  NDK=c:/Users/storm/AppData/Local/Android/Sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-16/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
  
  CUR=`cygpath -m $(pwd)`
  
  TEMPDIR=`cygpath -m /tmp`
  
  TMP=`cygpath -m /tmp`
  
  function build_one
  
  {
  
  sed -i 's/ln_s="ln -s -f"/ln_s="cp -f"/g' ./configure
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --enable-shared \
  
  --disable-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
  
  sed -i':a;N;$!ba;s/gcc 4.9\r/gcc 4.9/g' ./config.h
  
  sed -i':a;N;$!ba;s/gcc 4.9\r/gcc 4.9/g' ./config.mak
  
  #make clean
  
  #make
  
  #make install
  
  }
  
  CPU=arm
  
  PREFIX=$CUR/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  Where is the problem ?