video_trimmer 0.2.0

A Flutter package for trimming videos. This supports retrieving, trimming, and storage of trimmed video files to the file system.

A Flutter package for trimming videos

Features

• Customizable video trimmer
• Video playback control
• Retrieving and storing video file

Also, supports conversion to GIF.

TRIM EDITOR

EXAMPLE APP

CUSTOMIZABLE VIDEO EDITOR

Usage

• Add the dependency video_trimmer to your pubspec.yaml file.

Android

• Go to <project root>/android/app/build.gradle and set the minSdkVersion to 24:

  minSdkVersion 24
  

• Go to <project root>/android/build.gradle and add the following line:

  ext.flutterFFmpegPackage = 'full'
  

iOS

• Add the following keys to your Info.plist file, located in <project root>/ios/Runner/Info.plist:

  <key>NSCameraUsageDescription</key>
  <string>Used to demonstrate image picker plugin</string>
  <key>NSMicrophoneUsageDescription</key>
  <string>Used to capture audio for image picker plugin</string>
  <key>NSPhotoLibraryUsageDescription</key>
  <string>Used to demonstrate image picker plugin</string>
  

• Set the platform version in ios/Podfile:

  platform :ios, '9.3'
  

• Replace with the following in the # Plugin Pods section of the ios/Podfile:

  # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
  # referring to absolute paths on developers' machines.
  
  system('rm -rf .symlinks')
  system('mkdir -p .symlinks/plugins')
  plugin_pods = parse_KV_file('../.flutter-plugins')
  plugin_pods.each do |name, path|
    symlink = File.join('.symlinks', 'plugins', name)
    File.symlink(path, symlink)
    if name == 'flutter_ffmpeg'
        pod name+'/full', :path => File.join(symlink, 'ios')
    else
        pod name, :path => File.join(symlink, 'ios')
    end
  end
  

Functionalities

Loading input video file

final Trimmer _trimmer = Trimmer();
await _trimmer.loadVideo(videoFile: file);

Saving trimmed video

Returns a string to indicate whether the saving operation was successful.

await _trimmer
    .saveTrimmedVideo(startValue: _startValue, endValue: _endValue)
    .then((value) {
  setState(() {
    _value = value;
  });
});

Video playback state

Returns the video playback state. If true then the video is playing, otherwise it is paused.

await _trimmer.videPlaybackControl(
  startValue: _startValue,
  endValue: _endValue,
);

Advanced Command

You can use an advanced FFmpeg command if you require more customization. Just define your FFmpeg command using the ffmpegCommand property and set an output video format using customVideoFormat.

Refer to the Official FFmpeg Documentation for more information.

NOTE: Passing a wrong video format to the customVideoFormat property may result in a crash.

// Example of defining a custom command

// This is already used for creating GIF by
// default, so you do not need to use this.

await _trimmer
    .saveTrimmedVideo(
        startValue: _startValue,
        endValue: _endValue,
        ffmpegCommand:
            '-vf "fps=10,scale=480:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0',
        customVideoFormat: '.gif')
    .then((value) {
  setState(() {
    _value = value;
  });
});

Widgets

Display a video playback area

VideoViewer()

Display the video trimmer area

TrimEditor(
  viewerHeight: 50.0,
  viewerWidth: MediaQuery.of(context).size.width,
  onChangeStart: (value) {
    _startValue = value;
  },
  onChangeEnd: (value) {
    _endValue = value;
  },
  onChangePlaybackState: (value) {
    setState(() {
      _isPlaying = value;
    });
  },
)

Example

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:video_trimmer/trim_editor.dart';
import 'package:video_trimmer/video_trimmer.dart';
import 'package:video_trimmer/video_viewer.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Video Trimmer',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  final Trimmer _trimmer = Trimmer();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Video Trimmer"),
      ),
      body: Center(
        child: Container(
          child: RaisedButton(
            child: Text("LOAD VIDEO"),
            onPressed: () async {
              File file = await ImagePicker.pickVideo(
                source: ImageSource.gallery,
              );
              if (file != null) {
                await _trimmer.loadVideo(videoFile: file);
                Navigator.of(context)
                    .push(MaterialPageRoute(builder: (context) {
                  return TrimmerView(_trimmer);
                }));
              }
            },
          ),
        ),
      ),
    );
  }
}

class TrimmerView extends StatefulWidget {
  final Trimmer _trimmer;
  TrimmerView(this._trimmer);
  @override
  _TrimmerViewState createState() => _TrimmerViewState();
}

class _TrimmerViewState extends State<TrimmerView> {
  double _startValue = 0.0;
  double _endValue = 0.0;

  bool _isPlaying = false;
  bool _progressVisibility = false;

  Future<String> _saveVideo() async {
    setState(() {
      _progressVisibility = true;
    });

    String _value;

    await widget._trimmer
        .saveTrimmedVideo(startValue: _startValue, endValue: _endValue)
        .then((value) {
      setState(() {
        _progressVisibility = false;
        _value = value;
      });
    });

    return _value;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Video Trimmer"),
      ),
      body: Builder(
        builder: (context) => Center(
          child: Container(
            padding: EdgeInsets.only(bottom: 30.0),
            color: Colors.black,
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              mainAxisSize: MainAxisSize.max,
              children: <Widget>[
                Visibility(
                  visible: _progressVisibility,
                  child: LinearProgressIndicator(
                    backgroundColor: Colors.red,
                  ),
                ),
                RaisedButton(
                  onPressed: _progressVisibility
                      ? null
                      : () async {
                          _saveVideo().then((value) {
                            final snackBar = SnackBar(content: Text(value));
                            Scaffold.of(context).showSnackBar(snackBar);
                          });
                        },
                  child: Text("SAVE"),
                ),
                Expanded(
                  child: VideoViewer(),
                ),
                Center(
                  child: TrimEditor(
                    viewerHeight: 50.0,
                    viewerWidth: MediaQuery.of(context).size.width,
                    onChangeStart: (value) {
                      _startValue = value;
                    },
                    onChangeEnd: (value) {
                      _endValue = value;
                    },
                    onChangePlaybackState: (value) {
                      setState(() {
                        _isPlaying = value;
                      });
                    },
                  ),
                ),
                FlatButton(
                  child: _isPlaying
                      ? Icon(
                          Icons.pause,
                          size: 80.0,
                          color: Colors.white,
                        )
                      : Icon(
                          Icons.play_arrow,
                          size: 80.0,
                          color: Colors.white,
                        ),
                  onPressed: () async {
                    bool playbackState =
                        await widget._trimmer.videPlaybackControl(
                      startValue: _startValue,
                      endValue: _endValue,
                    );
                    setState(() {
                      _isPlaying = playbackState;
                    });
                  },
                )
              ],
            ),
          ),
        ),
      ),
    );
  }
}