Very easy Flutter video player example, using chewie and and video_player library.

The app plays video from a remote HTTP URL and it plays in portrait mode, when you exit the video player it maintains portrait mode on your device.

pubspec.yaml

name: video_player
description: Flutter video player project.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.12.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  video_player: ^2.1.14
  chewie: ^1.2.2
  

dev_dependencies:
  flutter_test:
    sdk: flutter

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  #assets:
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

In your main function, make sure you run the app in portrait mode,

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
      .then((_) {
    runApp(MyApp());
  });
}

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:inspiration_show/pages/home.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
      .then((_) {
    runApp(MyApp());
  });
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Video Player',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.red,
      ),
      home: MyHomePage(title: 'Video Player Demo Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  String appBarTitle = "Home";

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(appBarTitle),
      ),
      body: HomeWidget(),
    );
  }
}

home.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:video_player/video_player.dart';
import 'package:chewie/chewie.dart';

class HomeWidget extends StatefulWidget {
  @override
  _VideoWidget createState() => _VideoWidget();
}

class _VideoWidget extends State<HomeWidget> {
  late VideoPlayerController videoPlayerController;
  late ChewieController chewieController;

  bool isReady = false;

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

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.all(16),
      child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
        Center(
          child: Container(
            height: 200,
            child: isReady == true
                ? Chewie(controller: chewieController)
                : Center(child: CircularProgressIndicator()),
          ),
        ),
      ]),
    );
  }

  @override
  void dispose() {
    super.dispose();
    videoPlayerController.dispose();
    chewieController.videoPlayerController.dispose();

    SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
  }

  Future<void> initializeVideoPlayer() async {
    videoPlayerController = VideoPlayerController.network(
        "https://file-examples-com.github.io/uploads/2017/04/file_example_MP4_1920_18MG.mp4");
    await Future.wait([videoPlayerController.initialize()]);

    chewieController = ChewieController(
        videoPlayerController: videoPlayerController,
        autoPlay: false,
        aspectRatio: 16 / 9,
        autoInitialize: true);

    setState(() {
      isReady = true;
    });

    chewieController.addListener(() {
      if (!chewieController.isFullScreen) {
        SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
      }
    });
  }
}

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