Flutter video recording example

main.dart

import 'package:camera/camera.dart';
import 'package:flutter/material.dart';

import 'video_recorder_screen.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final cameras = await availableCameras();
  final firstCamera = cameras.firstWhere((camera) {
    return camera.lensDirection == CameraLensDirection.front;
  });

  runApp(MaterialApp(
    theme: ThemeData.dark(),
    home: VideoRecorderScreen(camera: firstCamera),
  ));
}

video_player_screen.dart

import 'dart:io';

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

class VideoPlayerScreen extends StatefulWidget {
  final String videoPath;

  const VideoPlayerScreen({super.key, required this.videoPath});

  @override
  State<VideoPlayerScreen> createState() => _VideoPlayerScreenState();
}

class _VideoPlayerScreenState extends State<VideoPlayerScreen> {
  late VideoPlayerController _controller;
  late Future<void> _initializeControllerFuture;

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

    _controller = VideoPlayerController.file(File(widget.videoPath));
    _initializeControllerFuture = _controller.initialize();
    _controller.setLooping(true);
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Video player screen')),
      body: FutureBuilder(
        future: _initializeControllerFuture,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            return AspectRatio(
              aspectRatio: _controller.value.aspectRatio,
              child: VideoPlayer(_controller),
            );
          } else {
            return const Center(
              child: CircularProgressIndicator(),
            );
          }
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            if (_controller.value.isPlaying) {
              _controller.pause();
            } else {
              _controller.play();
            }
          });
        },
        child: Icon(
          _controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
        ),
      ),
    );
  }
}

video_recorder_screen.dart

import 'package:camera/camera.dart';
import 'package:flutter/material.dart';

import 'video_player_screen.dart';

class VideoRecorderScreen extends StatefulWidget {
  final CameraDescription camera;

  const VideoRecorderScreen({
    super.key,
    required this.camera,
  });

  @override
  State<VideoRecorderScreen> createState() => _VideoRecorderScreenState();
}

class _VideoRecorderScreenState extends State<VideoRecorderScreen> {
  late CameraController _controller;
  late Future<void> _initializeControllerFuture;
  bool _isRecording = false;

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

    _controller = CameraController(
      widget.camera,
      ResolutionPreset.medium,
    );

    _initializeControllerFuture = _controller.initialize();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Video recorder screen')),
      body: FutureBuilder<void>(
        future: _initializeControllerFuture,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            return CameraPreview(_controller);
          } else {
            return const Center(child: CircularProgressIndicator());
          }
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () async {
          try {
            await _initializeControllerFuture;

            if (!mounted) {
              return;
            }

            if (_isRecording) {
              final video = await _controller.stopVideoRecording();

              await Navigator.of(context).push(
                MaterialPageRoute(
                  builder: (context) => VideoPlayerScreen(
                    videoPath: video.path,
                  ),
                ),
              );
            } else {
              await _controller.prepareForVideoRecording();
              await _controller.startVideoRecording();
            }

            setState(() {
              _isRecording = !_isRecording;
            });
          } catch (e) {
            print(e);
          }
        },
        child: Icon(_isRecording ? Icons.stop : Icons.circle),
      ),
    );
  }
}