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Video Trimmer

A Flutter package for trimming videos

Features

  • Customizable video trimmer.
  • Supports two types of trim viewer, fixed length and scrollable.
  • Video playback control.
  • Retrieving and storing video file.

Also, supports conversion to GIF.

Migrating to v2.0.0: If you were using 1.x.x version of this package, checkout the BREAKING CHANGES by going to the Changelog tab on the pub.dev package page.

Following image shows the structure of the TrimViewer. It consists of the Duration on top (displaying the start, end, and scrubber time), TrimArea consisting of the thumbnails, and TrimEditor which is an overlay that let's you select a portion from the video.

Example

The example app running on a iPhone 13 Pro device:

Trimmer

Usage

Add the dependency video_trimmer to your pubspec.yaml file:

dependencies:
  video_trimmer: ^2.0.0

Android configuration

No additional configuration is needed for using on Android platform. You are good to go!

iOS configuration

  • 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 to 10.

    Refer to the FFmpeg Release section.

     platform :ios, '10'
    

FFmpeg Release

This package uses LTS version of the FFmpeg implementation.

LTS Release
Android API Level 16
Android Camera Access -
Android Architectures arm-v7a
arm-v7a-neon
arm64-v8a
x86
x86-64
iOS Min SDK 10
iOS Architectures armv7
arm64
i386
x86-64

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(trimmer: _trimmer)

Display the video trimmer area

TrimViewer(
  trimmer: _trimmer,
  viewerHeight: 50.0,
  viewerWidth: MediaQuery.of(context).size.width,
  maxVideoLength: const Duration(seconds: 10),
  onChangeStart: (value) => _startValue = value,
  onChangeEnd: (value) => _endValue = value,
  onChangePlaybackState: (value) =>
      setState(() => _isPlaying = value),
)

Example

Before using this example directly in a Flutter app, don't forget to add the video_trimmer & file_picker packages to your pubspec.yaml file.

You can try out this example by replacing the entire content of main.dart file of a newly created Flutter project.

import 'dart:io';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:video_trimmer/video_trimmer.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 {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Video Trimmer"),
      ),
      body: Center(
        child: Container(
          child: ElevatedButton(
            child: Text("LOAD VIDEO"),
            onPressed: () async {
              FilePickerResult? result = await FilePicker.platform.pickFiles(
                type: FileType.video,
                allowCompression: false,
              );
              if (result != null) {
                File file = File(result.files.single.path!);
                Navigator.of(context).push(
                  MaterialPageRoute(builder: (context) {
                    return TrimmerView(file);
                  }),
                );
              }
            },
          ),
        ),
      ),
    );
  }
}

class TrimmerView extends StatefulWidget {
  final File file;

  TrimmerView(this.file);

  @override
  _TrimmerViewState createState() => _TrimmerViewState();
}

class _TrimmerViewState extends State<TrimmerView> {
  final Trimmer _trimmer = Trimmer();

  double _startValue = 0.0;
  double _endValue = 0.0;

  bool _isPlaying = false;
  bool _progressVisibility = false;

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

    String? _value;

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

    return _value;
  }

  void _loadVideo() {
    _trimmer.loadVideo(videoFile: widget.file);
  }

  @override
  void initState() {
    super.initState();

    _loadVideo();
  }

  @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,
                  ),
                ),
                ElevatedButton(
                  onPressed: _progressVisibility
                      ? null
                      : () async {
                          _saveVideo().then((outputPath) {
                            print('OUTPUT PATH: $outputPath');
                            final snackBar = SnackBar(
                                content: Text('Video Saved successfully'));
                            ScaffoldMessenger.of(context).showSnackBar(
                              snackBar,
                            );
                          });
                        },
                  child: Text("SAVE"),
                ),
                Expanded(
                  child: VideoViewer(trimmer: _trimmer),
                ),
                Center(
                  child: TrimViewer(
                    trimmer: _trimmer,
                    viewerHeight: 50.0,
                    viewerWidth: MediaQuery.of(context).size.width,
                    maxVideoLength: const Duration(seconds: 10),
                    onChangeStart: (value) => _startValue = value,
                    onChangeEnd: (value) => _endValue = value,
                    onChangePlaybackState: (value) =>
                        setState(() => _isPlaying = value),
                  ),
                ),
                TextButton(
                  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 _trimmer.videPlaybackControl(
                      startValue: _startValue,
                      endValue: _endValue,
                    );
                    setState(() {
                      _isPlaying = playbackState;
                    });
                  },
                )
              ],
            ),
          ),
        ),
      ),
    );
  }
}

Troubleshooting

While running on the Android platform if it gives an error that the minSdkVersion needs to be 24, or on iOS platform that the Podfile platform version should be 11, first go to pubspec.lock file and see if the version of ffmpeg_kit_flutter has -LTS suffix. This should fix all issues for iOS platform.

On Android, if you still face the same issue, try adding the following to the <project_directory>/android/app/src/main/AndroidManifest.xml:

<manifest xmlns:tools="http://schemas.android.com/tools" ....... >
    <uses-sdk tools:overrideLibrary="com.arthenica.ffmpegkit.flutter, com.arthenica.ffmpegkit" />
</manifest>

License

Copyright (c) 2022 Souvik Biswas

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Libraries

video_trimmer