flutter_ffmpeg #

FFmpeg plugin for Flutter. Supports iOS and Android.

1. Features #

• Based on MobileFFmpeg

• Supports

  • Both Android and IOS

  • FFmpeg v4.2-dev-x (master) releases

  • arm-v7a, arm-v7a-neon, arm64-v8a, x86 and x86_64 architectures on Android

  • armv7, armv7s, arm64, arm64e, i386 and x86_64 architectures on IOS

  • 24 external libraries

    fontconfig, freetype, fribidi, gmp, gnutls, kvazaar, lame, libaom, libass, libiconv, libilbc, libtheora, libvorbis, libvpx, libwebp, libxml2, opencore-amr, opus, shine, snappy, soxr, speex, twolame, wavpack

  • 4 external libraries with GPL license

    vid.stab, x264, x265, xvidcore

  • zlib and MediaCodec Android system libraries

  • bzip2, zlib IOS system libraries and AudioToolbox, CoreImage, VideoToolbox, AVFoundation IOS system frameworks

• Licensed under LGPL 3.0, can be customized to support GPL v3.0

• Includes eight different packages with different external libraries enabled in FFmpeg

2. Installation #

Add flutter_ffmpeg as a dependency in your pubspec.yaml file.

2.1 Packages

Installation of FlutterFFmpeg using pub enables the default package, which is based on https package. It is possible to enable other packages using the following steps.

1. Use the following dependency block in your pubspec.yaml file.

   dependencies:
     flutter_ffmpeg:
       git:
         url: git://github.com/tanersener/flutter-ffmpeg.git
         ref: v0.2.0
         path: packages/flutter_ffmpeg_<package_name>
   
   

2. Update version in ref: argument.

3. Set package name in path: packages/flutter_ffmpeg_<package_name>[_lts] section. Include _lts postfix only if you want to depend on an LTS release.

2.2 LTS Releases

flutter_ffmpeg is published in two different variants: Main Release and LTS Release. Both releases share the same source code but is built with different settings. Below you can see the changes between the two.

3. Using #

1. Execute commands.

   • Use execute() method with a single command line

   import 'package:flutter_ffmpeg/flutter_ffmpeg.dart';
   
   final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
   
   _flutterFFmpeg.execute("-i file1.mp4 -c:v mpeg4 file2.mp4").then((rc) => print("FFmpeg process exited with rc $rc"));
   

   • Use executeWithArguments() method with an array of arguments

   import 'package:flutter_ffmpeg/flutter_ffmpeg.dart';
   
   final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
   
   var arguments = ["-i", "file1.mp4", "-c:v", "mpeg4", "file2.mp4"];
   _flutterFFmpeg.executeWithArguments(arguments).then((rc) => print("FFmpeg process exited with rc $rc"));
   

2. Check execution output. Zero represents successful execution, non-zero values represent failure.

   _flutterFFmpeg.getLastReturnCode().then((rc) => print("Last rc: $rc"));
   
   _flutterFFmpeg.getLastCommandOutput().then((output) => print("Last command output: $output"));
   

3. Stop an ongoing operation. Note that this function does not wait for termination to complete and returns immediately.

   _flutterFFmpeg.cancel();
   

4. Get media information for a file.

   • Print all fields

   _flutterFFmpeg.getMediaInformation("<file path or uri>").then((info) => print(info));
   

   • Print selected fields

   _flutterFFmpeg.getMediaInformation("<file path or uri>").then((info) {
       print("Media Information");
   
       print("Path: ${info['path']}");
       print("Format: ${info['format']}");
       print("Duration: ${info['duration']}");
       print("Start time: ${info['startTime']}");
       print("Bitrate: ${info['bitrate']}");
   
       if (info['streams'] != null) {
           final streamsInfoArray = info['streams'];
   
           if (streamsInfoArray.length > 0) {
               for (var streamsInfo in streamsInfoArray) {
                   print("Stream id: ${streamsInfo['index']}");
                   print("Stream type: ${streamsInfo['type']}");
                   print("Stream codec: ${streamsInfo['codec']}");
                   print("Stream full codec: ${streamsInfo['fullCodec']}");
                   print("Stream format: ${streamsInfo['format']}");
                   print("Stream full format: ${streamsInfo['fullFormat']}");
                   print("Stream width: ${streamsInfo['width']}");
                   print("Stream height: ${streamsInfo['height']}");
                   print("Stream bitrate: ${streamsInfo['bitrate']}");
                   print("Stream sample rate: ${streamsInfo['sampleRate']}");
                   print("Stream sample format: ${streamsInfo['sampleFormat']}");
                   print("Stream channel layout: ${streamsInfo['channelLayout']}");
                   print("Stream sar: ${streamsInfo['sampleAspectRatio']}");
                   print("Stream dar: ${streamsInfo['displayAspectRatio']}");
                   print("Stream average frame rate: ${streamsInfo['averageFrameRate']}");
                   print("Stream real frame rate: ${streamsInfo['realFrameRate']}");
                   print("Stream time base: ${streamsInfo['timeBase']}");
                   print("Stream codec time base: ${streamsInfo['codecTimeBase']}");
               }
           }
       }
   
   

5. Enable log callback and redirect all FFmpeg logs to a console/file/widget.

   void logCallback(int level, String message) {
       print(message);
   }
   ...
   _flutterFFmpeg.enableLogCallback(this.logCallback);
   

6. Enable statistics callback and follow the progress of an ongoing operation.

   void statisticsCallback(int time, int size, double bitrate, double speed, int videoFrameNumber, double videoQuality, double videoFps) {
       print("Statistics: time: $time, size: $size, bitrate: $bitrate, speed: $speed, videoFrameNumber: $videoFrameNumber, videoQuality: $videoQuality, videoFps: $videoFps");
   }
   ...
   _flutterFFmpeg.enableStatisticsCallback(this.statisticsCallback);
   

7. Poll statistics without implementing statistics callback.

   _flutterFFmpeg.getLastReceivedStatistics().then((stats) => print(stats));
   

8. Reset statistics before starting a new operation.

   _flutterFFmpeg.resetStatistics();
   

9. Set log level.

   _flutterFFmpeg.setLogLevel(LogLevel.AV_LOG_WARNING);
   

10. Register your own fonts by specifying a custom fonts directory, so they are available to use in FFmpeg filters.

    _flutterFFmpeg.setFontDirectory("<folder with fonts>");
    

11. Use your own fontconfig configuration.

    _flutterFFmpeg.setFontconfigConfigurationPath("<fontconfig configuration directory>");
    

12. Disable log functionality of the library. Logs will not be printed to console and log callback will be disabled.

    _flutterFFmpeg.disableLogs();
    

13. Disable statistics functionality of the library. Statistics callback will be disabled but the last received statistics data will be still available.

    _flutterFFmpeg.disableStatistics();
    

14. List enabled external libraries.

    _flutterFFmpeg.getExternalLibraries().then((packageList) {
         packageList.forEach((value) => print("External library: $value"));
    });
    

4. Tips #

• You should not use double quotes (") to define your complex filters or map definitions.

   -filter_complex [0:v]scale=1280:-1[v] -map [v]
  

• If your commands include unnecessary quotes or space characters, your command will fail with No such filter: ' ' errors. Please check your command and remove them.

• FlutterFFmpeg.execute method has an optional delimiter parameter. Delimiter defines how a command string will be split into arguments. When a delimiter is not specified then space character is used as default delimiter. Consequently if you have a space character in one of your command arguments, in filename or in -filter_complex block, then your command string will be split into invalid arguments and execution will fail. You can fix this error by splitting your command string into array yourself and calling executeWithArguments method or using a different delimiter character in your command string and specifying it in the execute call.

• Enabling ProGuard on Android causes linking errors. Please add the following rule inside your proguard-rules.pro file to preserve necessary method names and prevent linking errors.

  -keep class com.arthenica.mobileffmpeg.Config {
      native <methods>;
      void log(int, byte[]);
      void statistics(int, float, float, long , int, double, double);
  }
  

• By default, Xcode compresses PNG files during packaging. If you use .png files in your commands make sure you set the following two settings to NO. If one of them is set to YES, your operations may fail with Error while decoding stream #0:0: Generic error in an external library error.

  

• Some flutter_ffmpeg packages include libc++_shared.so native library. If a second library which also includes libc++_shared.so is added as a dependency, gradle fails with More than one file was found with OS independent path 'lib/x86/libc++_shared.so' error message.

  You can fix this error by adding the following block into your build.gradle.

  android {
      packagingOptions {
          pickFirst 'lib/x86/libc++_shared.so'
          pickFirst 'lib/x86_64/libc++_shared.so'
          pickFirst 'lib/armeabi-v7a/libc++_shared.so'
          pickFirst 'lib/arm64-v8a/libc++_shared.so'
      }
  }
  

5. Updates #

Refer to Changelog for updates.

6. License #

This project is licensed under the LGPL v3.0. However, if installation is customized to use a package with -gpl postfix (min-gpl, https-gpl, full-gpl) then FlutterFFmpeg is subject to the GPL v3.0 license.

Digital assets used in test applications are published in the public domain.

7. Contributing #

Feel free to submit issues or pull requests.

8. See Also #

• FFmpeg
• Mobile FFmpeg Wiki
• FFmpeg License and Legal Considerations