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• Have 2 blocking scripts interact with each other in linux

  18 novembre 2014, par Ortixx

  I have 2 blocking shell scripts which I want to have interact with each other. The scripts in question are peerflix (nodejs script) and ffmpeg (a simple bash script).

  What happens : Peerflix fires up, feeds data to ffmpeg bash scrip which terminates peerflix on completion.

  So once peerflix starts it outputs 2 lines and blocks immediately :

  [08:15 PM]-[vagrant@packer-virtualbox-iso]-[/var/www/test]-[git master] 
  
  $ node /var/www/test/node/node_modules/peerflix/app.js /var/www/test/flexget/torrents/test.torrent -r -q
  
  listening: http://10.0.2.15:38339/
  
  process: 9601

  I have to feed the listening address to the ffmpeg bash script :

  #!/bin/sh
  
  ffmpeg -ss 00:05:00 -i {THE_LISTENING_PORT} -frames:v 1 out1.jpg
  
  ffmpeg -ss 00:10:00 -i {THE_LISTENING_PORT} -frames:v 1 out2.jpg

  After the bash script is done I have to kill the peerflix script (hence me outputting the PID).

  My question is how do I achieve this ?

• ffmpeg concatenation with -filter_complex

  16 octobre 2018, par Igniter

  I’ve seen several similar questions but none of them actually helped in my case.
  Getting this error while trying to join 1 audio and 4 video files of different nature and resolutions.

  ffmpeg -i 0.mp3 -i 1.mp4 -i 2.mkv -i 3.mkv -i 4.webm \
  
      -filter_complex [0:a:0][1:v:0][2:v:0][3:v:0][4:v:0]concat=n=5:v=1:a=1[outv][outa] \
  
      -map "[outv]" -map "[outa]" output.mp4

  All this gives the following error :

  Stream specifier ':a:0' in filtergraph description [0:a:0][1:v:0][2:v:0][3:v:0][4:v:0]concat=n=5:v=1:a=1[outv][outa] matches no streams.

  Straight concatenation -i "concat:0.mp3|1.mp4..." also doesn’t work as expected due to different resolutions and video formats. All methods syntax was taken from official documentation but there should be something that I’ve missed here.

  Full output log :

  ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mp3, from 'mp3/10.mp3':
  
    Metadata:
  
      album_artist    : artist
  
      title           : title
  
      artist          : 10
  
      album           : 12
  
      track           : 1
  
      VideoKind       : 2
  
      date            : 2009
  
    Duration: 00:06:00.44, start: 0.025056, bitrate: 64 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 64 kb/s
  
      Metadata:
  
        encoder         : LAME3.98r
  
      Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 200x200 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        comment         : Cover (front)
  
  Input #1, matroska,webm, from '1.mp4':
  
    Metadata:
  
      MINOR_VERSION   : 0
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      ENCODER         : Lavf57.83.100
  
    Duration: 00:01:53.05, start: 0.007000, bitrate: 2292 kb/s
  
      Stream #1:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:01:53.048000000
  
  Input #2, matroska,webm, from '2.mkv':
  
    Metadata:
  
      MINOR_VERSION   : 0
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      ENCODER         : Lavf57.83.100
  
    Duration: 00:02:08.09, start: 0.007000, bitrate: 1607 kb/s
  
      Stream #2:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:02:08.090000000
  
  Input #3, matroska,webm, from '3.mkv':
  
    Metadata:
  
      MINOR_VERSION   : 0
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      ENCODER         : Lavf57.83.100
  
    Duration: 00:01:37.05, start: 0.007000, bitrate: 3525 kb/s
  
      Stream #3:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:01:37.048000000
  
  Input #4, matroska,webm, from '4.webm':
  
    Metadata:
  
      MINOR_VERSION   : 0
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      ENCODER         : Lavf57.83.100
  
    Duration: 00:01:45.13, start: 0.007000, bitrate: 3685 kb/s
  
      Stream #4:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:01:45.131000000
  
  Stream specifier ':a:0' in filtergraph description [0:a:0][1:v:0][2:v:0][3:v:0][4:v:0]concat=n=5:v=1:a=1[outv][outa] matches no streams.

• ffmpeg trouble with NetMaui and Android [closed]

  15 juin 2024, par Billy Vanegas

  I find myself in a following predicament. While I work with Visual Studio 2022, ffmpeg performs flawlessly on Windows platform. However, I'm encountering difficulties when attempting to replicate this functionality on Android. Despite exploring NuGet packages like FFMpegCore, which seem to be ffmpeg wrappers but lack ffmpeg itself, I'm still struggling to find a clear path forward. I've even tried integrating ffmpeg-kit for Android as per the instructions, only to face repeated failures and a sense of confusion. I must admit my puzzlement : why isn't there a straightforward method to seamlessly add ffmpeg to a .NET MAUI project that functions consistently across both iOS and Android platforms ?

  


  I want to convert MP3 files to WAV format using FFmpeg on the Android platform within a .NET MAUI project.

  


  I am using the FFmpegCore library and have downloaded the FFmpeg binaries from the official FFmpeg website. However, I encountered issues when attempting to pass the binary folder on the emulator, when I try to pass it, I get permission denied in working folder :
/data/user/0/com.companyname.projectname/files/ffmpeg on this part of code :

  


           await FFMpegArguments
               .FromFileInput(mp3Path)
               .OutputToFile(wavPath, true, options => options
                   .WithAudioCodec("pcm_s16le")
                   .WithAudioSamplingRate(44100)
                   .WithAudioBitrate(320000)
                   )
               .ProcessAsynchronously();


  


  This is the AndroidManifest.xml

  


  &lt;?xml version="1.0" encoding="utf-8"?>&#xA;<manifest>&#xA;    <application></application>&#xA;    &#xA;    &#xA;    &#xA;    &#xA;</manifest>&#xA;

  


   private async Task ConvertMp3ToWav(string mp3Path, string wavPath)
 {
     try
     {
         var directory = Path.GetDirectoryName(wavPath);
         if (!Directory.Exists(directory))
             Directory.CreateDirectory(directory!);
         if (!File.Exists(wavPath))
             Console.WriteLine($"File not found {wavPath}, creating empty file.");
             using var fs = new FileStream(wavPath, FileMode.CreateNew);
         if (!File.Exists(mp3Path))
             Console.WriteLine($"File not found {mp3Path}");

         string? ffmpegBinaryPath = await ExtractFFmpegBinaries(Platform.AppContext);
         FFMpegCore.GlobalFFOptions.Configure(new FFOptions { BinaryFolder = Path.GetDirectoryName(ffmpegBinaryPath!)! });

         await FFMpegArguments
               .FromFileInput(mp3Path)
               .OutputToFile(wavPath, true, options => options
                   .WithAudioCodec("pcm_s16le")
                   .WithAudioSamplingRate(44100)
                   .WithAudioBitrate(320000)
                   )
               .ProcessAsynchronously();
     }
     catch (Exception ex)
     {
         Console.WriteLine($"An error occurred during the conversion process: {ex.Message}");
         throw;
     }
 }


  


      private async Task<string> ExtractFFmpegBinaries(Context context)&#xA;    {&#xA;        var architectureFolder = "x86"; // "armeabi-v7a";&#xA;        var ffmpegBinaryName = "ffmpeg"; &#xA;        var ffmpegBinaryPath = Path.Combine(context.FilesDir!.AbsolutePath, ffmpegBinaryName);&#xA;        var tempFFMpegFileName = Path.Combine(FileSystem.AppDataDirectory, ffmpegBinaryName);&#xA;&#xA;        if (!File.Exists(ffmpegBinaryPath))&#xA;        {&#xA;            try&#xA;            {&#xA;                var assetPath = $"Libs/{architectureFolder}/{ffmpegBinaryName}";&#xA;                using var assetStream = context.Assets!.Open(assetPath);&#xA;               &#xA;                await using var tempFFMpegFile = File.OpenWrite(tempFFMpegFileName);&#xA;                await assetStream.CopyToAsync(tempFFMpegFile);&#xA;&#xA;                //new MainActivity().RequestStoragePermission();&#xA;                Java.Lang.Runtime.GetRuntime()!.Exec($"chmod 755 {tempFFMpegFileName}");&#xA;            }&#xA;            catch (Exception ex)&#xA;            {&#xA;                Console.WriteLine($"An error occurred while extracting FFmpeg binaries: {ex.Message}");&#xA;                throw;&#xA;            }&#xA;        }&#xA;        else&#xA;        {&#xA;            Console.WriteLine($"FFmpeg binaries already extracted to: {ffmpegBinaryPath}");&#xA;        }&#xA;&#xA;        return tempFFMpegFileName!;&#xA;    }&#xA;</string>