flutter_video_trimmer 3.1.0

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

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 flutter_video_trimmer to your pubspec.yaml file:

For using main version of FFmpeg package:

dependencies:  
 flutter_video_trimmer: ^3.1.0  

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> ```
  

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.videoPlaybackControl(  
 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 flutter_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:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
import 'package:flutter_video_trimmer/flutter_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(runCommand: (cmd) => FFmpegKit.execute(cmd),); 
 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; }); }, ) ], ), ), ), ), ); }}  

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>  

👨‍💻 About the Maintainer

Hi, I'm Kasun Thilina – a passionate Flutter developer focused on performance, scalability, and clean architecture.

• 🔗 LinkedIn

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