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• mix two audio files fmpeg Android

  21 mars 2016, par Adroid Freak

  I’m using ffmpeg for android and I’m trying to mix two audio files but I’m getting the following error

   [NULL @ 0xb60c8c00] Unable to find a suitable output format for ' -filter_complex amerge -c:a libmp3lame -q:a 4 '
  
  -filter_complex amerge -c:a libmp3lame -q:a 4 : Invalid argument

  This is the ffmpeg library details when

  ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Dec 22 2014 21:35:30 with gcc 4.8 (GCC)
  
  configuration: --target-os=linux --cross-prefix=/home/android/Downloads/ffmpeg-android-pie/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/android/Downloads/ffmpeg-android-pie/toolchain-android/sysroot --enable-decoders --enable-encoders --enable-filters --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --enable-pic --enable-libx264 --enable-version3 --disable-debug --disable-ffserver --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/android/Downloads/ffmpeg-android-pie/ffmpeg-pkg-config --prefix=/home/android/Downloads/ffmpeg-android-pie/build/armeabi-v7a --extra-cflags='-I/home/android/Downloads/ffmpeg-android-pie/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/android/Downloads/ffmpeg-android-pie/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
  libavutil      54.  7.100 / 54.  7.100
  
  libavcodec     56.  1.100 / 56.  1.100
  
  libavformat    56.  4.101 / 56.  4.101
  
  libavdevice    56.  0.100 / 56.  0.100
  
  libavfilter     5.  1.100 /  5.  1.100
  
  libswscale      3.  0.100 /  3.  0.100
  
  libswresample   1.  1.100 /  1.  1.100
  
  libpostproc    53.  0.100 / 53.  0.100

  My function is this

  public Clip mixTwoAudioFiles (String audio1, String audio2, Clip out, ShellCallback sc) throws Exception
  
  {
  
      ArrayList<string> cmd = new ArrayList<string>();
  
  
  
      cmd.add(mFfmpegBin);
  
      cmd.add("-y");
  
  
  
      cmd.add("-i");
  
      cmd.add(audio1);
  
  
  
      cmd.add("-i");
  
      cmd.add(audio2);
  
  //  cmd.add("-strict");
  
  //  cmd.add("-2");//experimental
  
  
  
      cmd.add(" -filter_complex amerge -c:a libmp3lame -q:a 4 ");   
  
      File fileOut = new File(out.path);
  
      cmd.add(fileOut.getCanonicalPath());    
  
      execFFMPEG(cmd, sc); 
  
      return out;
  
  
  
  }
  
  </string></string>

  and the output command is this

  ffmpeg -y -i /storage/emulated/0/audio1.mp3 -i /storage/emulated/0/audio2.3gp -strict -2  -filter_complex amerge -c:a libmp3lame -q:a 4  /storage/emulated/0/out.mp4 

  Now as you can see above I don’t have libmp3lame enabled but it looks like the error above is not related to that, correct ?

  I tried many other filter variations but all are failing with the same error, the questions I have are as follow :

  1- Since I don't have libmp3lame, what is the next option? please note that mp3 is not mandatory here.
  
  2- If it is possible can you please show me how?

• Build FFMPEG 3.1.4 for Android

  20 octobre 2016, par Vladimir Kulyk

  I used this and this methods to build latest (3.1.4) FFMPEG version for Android.
  Build was succeed.
  I got several folders with sources / headers / .o files.
  But unfortunately there are no .so files I need.
  Are there some updated script for building latest FFMPEG for android ?
  Or, how to convert .o and other files to .so ?

• Advice about older android, VideoView and resolutions

  20 avril 2016, par Diogo Garcia

  I’ve been testing webm and mp4 for videoView and looking around for quite some time and right now the best way for me to play a video in a older android(2.3.3+) is using mp4 AVC-Baseline using the code

  "ffmpeg.exe" -i "intro.mp4" -codec:v libx264 -profile:v baseline
  -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=432:320 -codec:a aac -strict experimental -b:a 96k -f mp4 "intro_result.mp4"

  By far this is the best solution for my android 2.3.3 device... But this resolution is very low when using it in a bigger device for example it gets blurry, so I tried to increase the resolution but it crashes the video when I try to run in my android 2.3.3 device.

  Does anyone has any idea how to be able to view this video no matter the resolution of the device ?

  I was thinking about keep a high quality video inside the app and then check if the device has a low resolution and somehow try to resize the hiquality video before injecting it inside the VideoView. But I don’t even know if it is possible...