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• How to build ffmpeg executable binary for Android ?

  22 février 2016, par Én Xinh Lung Linh

  I’m struggling how to build an executable binary of ffmpeg for Android command.
  I am very new to ffmpeg which I need to extract audio from video files such as mp4.

  I followed a tutorial here to build ffmpeg binary : http://www.roman10.net/how-to-build-ffmpeg-for-android/

  I dont need *.so file to use in NDK but only an executable binary.

  I tried to enable : --enable-ffmpeg in shell script build. It yielded a ffmpeg file too. Especially, the file size is small with around 2M. However, I am unable to use it in android execution as following :

  p = Runtime.getRuntime().exec("/data/data/example/ffmpeg -i /sdcard/test.mp4  -vn -acodec copy /sdcard/test.aac");

  The above executed very quickly and of course it didn’t give any result.

  I continued searching and found an example here : https://github.com/guardianproject/android-ffmpeg-java

  The ffmpeg binary in the project is nice, I can run some command with desired output. However, some conversions to mp3 format gets failed because probably it lacked libmp3lame when building. Specially, ffmpeg is heavier than mine quite much, it is about 15M. I don’t know how they build the binayr.

  I’m looking for is a proper guide which I can build with arbitrary options such as libmp3lame, libshine. I get stuck at m4a to mp3 conversion.

  Everybody who has experience in ffmpeg, please guide me. Thank you !

• FFProbe doesn't work

  24 février 2018, par Royal.O

  Argument /storage/emulated/0/Watermark/test.flv provided as input filename, but ffprobe was already specified.
  compile 'nl.bravobit:android-ffmpeg:1.1.1

             String [] command = {"ffprobe", videoPath };
  
             FFprobe ffprobe = FFprobe.getInstance(this);
  
  
  
              try {
  
              ffprobe.execute(command, new ExecuteBinaryResponseHandler() {
  
  
  
                  @Override
  
                  public void onSuccess(String message) {
  
                      addTextViewToLayout("SUCCESS with output : "+ message);
  
                      Logger.print("onSuccess : "+message);
  
  
  
                  }
  
                  @Override
  
                  public void onProgress(String message) {
  
                      addTextViewToLayout("Started command : ffmpeg "+command);
  
                      addTextViewToLayout("progress : "+message);
  
                      Logger.print("Started command : ffmpeg "+command.toString());
  
                      Logger.print("progress : "+message);
  
                  }
  
  
  
                  @Override
  
                  public void onFailure(String message) {
  
                      Logger.print("FAILED with output : "+message);
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
                      Logger.print("onStart");
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      Logger.print("onFinish");
  
                  }
  
  
  
              });
  
          } catch (FFprobeCommandAlreadyRunningException e) {
  
              e.printStackTrace();
  
          }
  
  
  
  
  
      }

  ffprobe works good in Windows, Mac, Ubuntu but doesn’t work in Android.

  If anybody experienced please share me your experience.

• How can I play audio file(.mp3, .flac, .wav) and then loop over it (mix every few seconds) another audio file(wav) using ffmpeg

  11 mars 2019, par lukistar

  I got two different commands.

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[0:a]atrim=end=10,asetpts=N/SR/TB[begin];[0:a]atrim=start=10,asetpts=N/SR/TB[end];[begin][1:a][end]concat=n=3:v=0:a=1[a]" -map "[a]" output

  This command inserts second.mp3 into input.mp3. It seems to always keep the parameters of input.mp3. It inserts it in exact 10 seconds of input.mp3.

  Here is the second command :

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[1:a]adelay=10000|10000[1a];[0:a][1a]amix=duration:first" output

  This command is closer to my final goal. It plays input.mp3 and in exact 10 seconds it plays along second.mp3 without stopping input.mp3’s sound.(I think that’s called mixing ?)

  My final goal is to create final.mp3.

  Its duration must always equal input.mp3 duration. It must keep the samplerate, the count of channels, etc of input.mp3

  When playing final.mp3, it must play the whole input.mp3.
  But each 10-15 seconds, it must play second.mp3 without stopping input.mp3.(mix)
  It could be said that I must use "Second command" but in a loop.
  It would be great if there is one-line command for that in ffmpeg.
  I am working with flac, mp3 and wav and both of the commands were suitable for that.

  For example :

  input.mp3 could be 40 seconds long.

  second.mp3 could be 2 seconds long.

  When I play final.mp3 it will be 40 seconds long, but each 10-15 seconds(on random) it will play second.mp3 at the same time as input.mp3.

  Sadly I have no experience with ffmpeg, both of the commands I got are answers to questions here in stackoverflow. Hope somebody can help me. Thank you !