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• FFMPEG sidechaincompress not working as it should ?

  23 octobre 2017, par Taapo

  I have been trying to get sidechaining to work with FFMPEG, but my complex filter skills are lacking.

  I’m running two aif files into ffmpeg, hoping the voice would "duck" the background music when the voice-over is speaking. But I get an error with this command-line (on Windows, with latest FFMPEG binary) :

  ffmpeg.exe -i temp_music.aif -i temp_voice.aif \
  
  -filter_complex "[1:a]asplit=2[sc][mix];[0:a] \
  
  [sc]sidechaincompress=threshold=0.1:ratio=5[bg]; \
  
  [bg][mix]amerge[fin‌​al]" -map [final] final.mp3

  Everything decodes fine :

      ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, aiff, from 'temp_music.aif':
  
    Duration: 00:01:26.68, start: 0.000000, bitrate: 1536 kb/s
  
      Stream #0:0: Audio: pcm_s16be, 48000 Hz, stereo, s16, 1536 kb/s
  
  Guessed Channel Layout for Input Stream #1.0 : stereo
  
  Input #1, aiff, from 'temp_voice.aif':
  
    Duration: 00:01:26.68, start: 0.000000, bitrate: 1536 kb/s
  
      Stream #1:0: Audio: pcm_s16be, 48000 Hz, stereo, s16, 1536 kb/s
  
  Output with label 'final' does not exist in any defined filter graph, or was already used elsewhere.

  But then I receive an error :

  Output with label ’final’ does not exist in any defined filter graph,
  or was already used elsewhere.

  Anybody knows why ?

• Extract audio from video in mp3 format using android-ffmpeg-library

  28 mai 2014, par user2870161

  I want extrat audio from any type of video file and save it in mp3 format using android-ffmpeg-library.

  My most of work is done here i am create wav file using this code but problame is when i create mp3 file it make only 0kb file in sdcard.

  I hope I’ve made myself clear, and thanks for taking the time to read this.

      if (inputPath == null || outputPath == null) {
  
          throw new IllegalStateException("Need an input and output filepath!");
  
      }   
  
  
  
      final List<string> cmd = new LinkedList<string>();
  
  
  
  
  
      String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
  
      String fileName = "3.mp4";
  
      String fileName1 = "2.mp3";
  
  
  
      String path  = baseDir + "/" + fileName;
  
      String path1  = baseDir + "/" + fileName1;
  
  
  
        File f = new File(path);
  
  
  
        if(f.exists()){
  
            System.out.println("File existed");
  
        }else{
  
            System.out.println("File not found!");
  
        }
  
  
  
        cmd.add(mFfmpegPath);
  
        cmd.add("-i");
  
        cmd.add(path);
  
  
  
        cmd.add("-vn");
  
        cmd.add("-acodec");
  
        cmd.add("copy");
  
  
  
        cmd.add(path1);
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
      final ProcessBuilder pb = new ProcessBuilder(cmd);
  
      return new ProcessRunnable(pb);
  
  </string></string>

• Unrecognized option 'crf'

  6 septembre 2022, par Arjit Kaushal

  I am trying compress video using ffmpeg but i am facing errors in the command.
Although it runs perfectly fine on my linux terminal.( ffmpeg -i input.avi -vcodec libx264 -crf 24 output.avi).

  


  my code :

  


  void _compress() {
        if (_videoModel == null) return;
        String inputPath = _videoModel!.originalCachePath;
        String outputPath = _videoModel!.editCachePath;
    
        FFmpegKit.execute("-i $inputPath -vcodec libx264 -crf 24 -y $outputPath")
            .then((session) async {
          final returnCode = await session.getReturnCode();
          if (ReturnCode.isSuccess(returnCode)) {
            Navigator.pushNamed(context, PreviewPage.routeName,
                arguments: _videoModel);
          } else if (ReturnCode.isCancel(returnCode)) {
            print("compress cancel");
          } else {
            print("compress error : $returnCode");
            FFmpegKitConfig.enableLogCallback((log){
              final message = log.getMessage();
              print(message);
            });
    
    
          }
        });
      }


  


  I am facing the following errors :
Unrecognized option 'crf',
I/flutter (31056) : Error splitting the argument list,
Option not found.