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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.

• Is the output ts file size when using ffmpeg convert rtmp to hls with adaptive bitrate too large ?

  21 juillet 2022, par bui the vuong

  I want to convert rtmp to hls that supports adaptive bitrate , when referencing in many sources I use this configuration , but I found the ts file size of 240 to 720 bitrates is larger than I thought , I thought src will have to be the maximum size or 720p , please explain to me why , and is it possible to reduce the file size ( does any option in ffmpeg increase it ) ? Thanks everyone.

  


  My ffmpeg command :

  


  ffmpeg -i rtmp://localhost:1935/$app/$name -async 1 -vsync -1
                    -c:v libx264 -c:a aac -b:v 256k -b:a 64k -g 2 -vf "scale=426:trunc(ow/a/2)*2" -tune zerolatency -preset ultrafast -crf 23 -f flv rtmp://localhost:1935/show/$name_240
                    -c:v libx264 -c:a aac -b:v 768k -b:a 128k -g 2 -vf "scale=720:trunc(ow/a/2)*2" -tune zerolatency -preset ultrafast -crf 23 -f flv rtmp://localhost:1935/show/$name_360
                    -c:v libx264 -c:a aac -b:v 1024k -b:a 128k -g 2 -vf "scale=960:trunc(ow/a/2)*2" -tune zerolatency -preset ultrafast -crf 23 -f flv rtmp://localhost:1935/show/$name_480
                    -c:v libx264 -c:a aac -b:v 1920k -b:a 128k -g 2 -vf "scale=1280:trunc(ow/a/2)*2" -tune zerolatency -preset ultrafast -crf 23 -f flv rtmp://localhost:1935/show/$name_720
                    -c copy -f flv rtmp://localhost:1935/show/$name_src;


  


• 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