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Description:

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.

NOTE: Versions 3.0.0 and above uses the "Full" version of Flutter FFmpeg. To install the "LTS" version, use the "x.x.x-LTS" version of this package.

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 an iPhone 13 Pro device:

Usage #
Add the dependency video_trimmer to your pubspec.yaml file:
For using main version of FFmpeg package:
dependencies:
video_trimmer: ^3.0.0
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For using LTS version of FFmpeg package:
dependencies:
video_trimmer: ^3.0.0-LTS
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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>
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FFmpeg Release #
This package supports both Main and LTS version of the FFmpeg implementation.

Main Release
LTS Release

Android API Level
24
16

Android Camera Access
Yes
-

Android Architectures
arm-v7a-neonarm64-v8ax86x86-64
arm-v7aarm-v7a-neonarm64-v8ax86x86-64

iOS Min SDK
12.1
10

iOS Architectures
arm64arm64-simulatorarm64-mac-catalystx86-64x86-64-mac-catalyst
armv7arm64i386x86-64

Functionalities #
Loading input video file #
final Trimmer _trimmer = Trimmer();
await _trimmer.loadVideo(videoFile: file);
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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;
});
});
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Video playback state #
Returns the video playback state. If true then the video is playing, otherwise it is paused.
await _trimmer.videoPlaybackControl(
startValue: _startValue,
endValue: _endValue,
);
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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;
});
});
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Widgets #
Display a video playback area #
VideoViewer(trimmer: _trimmer)
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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),
)
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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.videoPlaybackControl(
startValue: _startValue,
endValue: _endValue,
);
setState(() {
_isPlaying = playbackState;
});
},
)
],
),
),
),
),
);
}
}
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Troubleshooting LTS version #
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>
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License #
Copyright (c) 2023 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.