How to Capture Video With Flutter

How to Capture Video With Flutter?

Now a day almost every application requires functionality like Video Conferencing  So in this article, Today we are going to Discuss How to Capture Video With Flutter ?

How to Capture Video With Flutter?

Video recording is now enabled by our team on the official camera plugin v0.2.0.

The example app for this plugin uses additional plugins path_provider
and video_player to display a sample of the video recorded.

Flutter provides a packages “camera” and “video_player“. The camera is used for accessing the camera of the phone and video_plater is used for video recording. You can use the camera package and record the video.

Go to your pubspec.yaml file and put a plugin like below:

dependencies:
   camera: 0.10.5+9
   fluttertoast: 
   path_provider:
   video_player:

Now consider a code snippet like the below:

import 'dart:async';
import 'dart:io';

import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:video_player/video_player.dart';
import 'package:fluttertoast/fluttertoast.dart';

class VideoRecorderExample extends StatefulWidget {
  @override
  _VideoRecorderExampleState createState() {
    return _VideoRecorderExampleState();
  }
}

class _VideoRecorderExampleState extends State<VideoRecorderExample> {
  CameraController controller;
  String videoPath;

  List<CameraDescription> cameras;
  int selectedCameraIdx;

  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

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

    // Get the listonNewCameraSelected of available cameras.
    // Then set the first camera as selected.
    availableCameras()
        .then((availableCameras) {
      cameras = availableCameras;

      if (cameras.length > 0) {
        setState(() {
          selectedCameraIdx = 0;
        });

        _onCameraSwitched(cameras[selectedCameraIdx]).then((void v) {});
      }
    })
        .catchError((err) {
      print('Error: $err.code\nError Message: $err.message');
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      appBar: AppBar(
        title: const Text('Camera example'),
      ),
      body: Column(
        children: <Widget>[
          Expanded(
            child: Container(
              child: Padding(
                padding: const EdgeInsets.all(1.0),
                child: Center(
                  child: _cameraPreviewWidget(),
                ),
              ),
              decoration: BoxDecoration(
                color: Colors.black,
                border: Border.all(
                  color: controller != null && controller.value.isRecordingVideo
                      ? Colors.redAccent
                      : Colors.grey,
                  width: 3.0,
                ),
              ),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(5.0),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.start,
              children: <Widget>[
                _cameraTogglesRowWidget(),
                _captureControlRowWidget(),
                Expanded(
                  child: SizedBox(),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  IconData _getCameraLensIcon(CameraLensDirection direction) {
    switch (direction) {
      case CameraLensDirection.back:
        return Icons.camera_rear;
      case CameraLensDirection.front:
        return Icons.camera_front;
      case CameraLensDirection.external:
        return Icons.camera;
      default:
        return Icons.device_unknown;
    }
  }

  // Display 'Loading' text when the camera is still loading.
  Widget _cameraPreviewWidget() {
    if (controller == null || !controller.value.isInitialized) {
      return const Text(
        'Loading',
        style: TextStyle(
          color: Colors.white,
          fontSize: 20.0,
          fontWeight: FontWeight.w900,
        ),
      );
    }

    return AspectRatio(
      aspectRatio: controller.value.aspectRatio,
      child: CameraPreview(controller),
    );
  }

  /// Display a row of toggle to select the camera (or a message if no camera is available).
  Widget _cameraTogglesRowWidget() {
    if (cameras == null) {
      return Row();
    }

    CameraDescription selectedCamera = cameras[selectedCameraIdx];
    CameraLensDirection lensDirection = selectedCamera.lensDirection;

    return Expanded(
      child: Align(
        alignment: Alignment.centerLeft,
        child: FlatButton.icon(
            onPressed: _onSwitchCamera,
            icon: Icon(
                _getCameraLensIcon(lensDirection)
            ),
            label: Text("${lensDirection.toString()
                .substring(lensDirection.toString().indexOf('.')+1)}")
        ),
      ),
    );
  }

  /// Display the control bar with buttons to record videos.
  Widget _captureControlRowWidget() {
    return Expanded(
      child: Align(
        alignment: Alignment.center,
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            IconButton(
              icon: const Icon(Icons.videocam),
              color: Colors.blue,
              onPressed: controller != null &&
                  controller.value.isInitialized &&
                  !controller.value.isRecordingVideo
                  ? _onRecordButtonPressed
                  : null,
            ),
            IconButton(
              icon: const Icon(Icons.stop),
              color: Colors.red,
              onPressed: controller != null &&
                  controller.value.isInitialized &&
                  controller.value.isRecordingVideo
                  ? _onStopButtonPressed
                  : null,
            )
          ],
        ),
      ),
    );
  }

  String timestamp() => DateTime.now().millisecondsSinceEpoch.toString();

  Future<void> _onCameraSwitched(CameraDescription cameraDescription) async {
    if (controller != null) {
      await controller.dispose();
    }

    controller = CameraController(cameraDescription, ResolutionPreset.high);

    // If the controller is updated then update the UI.
    controller.addListener(() {
      if (mounted) {
        setState(() {});
      }

      if (controller.value.hasError) {
        Fluttertoast.showToast(
            msg: 'Camera error ${controller.value.errorDescription}',
            toastLength: Toast.LENGTH_SHORT,
            gravity: ToastGravity.CENTER,
            timeInSecForIos: 1,
            backgroundColor: Colors.red,
            textColor: Colors.white
        );
      }
    });

    try {
      await controller.initialize();
    } on CameraException catch (e) {
      _showCameraException(e);
    }

    if (mounted) {
      setState(() {});
    }
  }

  void _onSwitchCamera() {
    selectedCameraIdx = selectedCameraIdx < cameras.length - 1
        ? selectedCameraIdx + 1
        : 0;
    CameraDescription selectedCamera = cameras[selectedCameraIdx];

    _onCameraSwitched(selectedCamera);

    setState(() {
      selectedCameraIdx = selectedCameraIdx;
    });
  }

  void _onRecordButtonPressed() {
    _startVideoRecording().then((String filePath) {
      if (filePath != null) {
        Fluttertoast.showToast(
            msg: 'Recording video started',
            toastLength: Toast.LENGTH_SHORT,
            gravity: ToastGravity.CENTER,
            timeInSecForIos: 1,
            backgroundColor: Colors.grey,
            textColor: Colors.white
        );
      }
    });
  }

  void _onStopButtonPressed() {
    _stopVideoRecording().then((_) {
      if (mounted) setState(() {});
      Fluttertoast.showToast(
          msg: 'Video recorded to $videoPath',
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER,
          timeInSecForIos: 1,
          backgroundColor: Colors.grey,
          textColor: Colors.white
      );
    });
  }

  Future<String> _startVideoRecording() async {
    if (!controller.value.isInitialized) {
      Fluttertoast.showToast(
          msg: 'Please wait',
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER,
          timeInSecForIos: 1,
          backgroundColor: Colors.grey,
          textColor: Colors.white
      );

      return null;
    }

    // Do nothing if a recording is on progress
    if (controller.value.isRecordingVideo) {
      return null;
    }

    final Directory appDirectory = await getApplicationDocumentsDirectory();
    final String videoDirectory = '${appDirectory.path}/Videos';
    await Directory(videoDirectory).create(recursive: true);
    final String currentTime = DateTime.now().millisecondsSinceEpoch.toString();
    final String filePath = '$videoDirectory/${currentTime}.mp4';

    try {
      await controller.startVideoRecording(filePath);
      videoPath = filePath;
    } on CameraException catch (e) {
      _showCameraException(e);
      return null;
    }

    return filePath;
  }

  Future<void> _stopVideoRecording() async {
    if (!controller.value.isRecordingVideo) {
      return null;
    }

    try {
      await controller.stopVideoRecording();
    } on CameraException catch (e) {
      _showCameraException(e);
      return null;
    }
  }

  void _showCameraException(CameraException e) {
    String errorText = 'Error: ${e.code}\nError Message: ${e.description}';
    print(errorText);

    Fluttertoast.showToast(
        msg: 'Error: ${e.code}\n${e.description}',
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIos: 1,
        backgroundColor: Colors.red,
        textColor: Colors.white
    );
  }
}

class VideoRecorderApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: VideoRecorderExample(),
    );
  }
}

Future<void> main() async {
  runApp(VideoRecorderApp());
}

Conclusion:

In this article, We have been through How to Capture Video With Flutter?

Thanks for being with us a Flutter Journey !!!

Keep Learning !!! Keep Fluttering !!!

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Nirali Patel

Written by Nirali Patel

Nirali Patel is a dedicated Flutter developer with over two years of experience, specializing in creating seamless mobile applications using Dart. With a passion for crafting user-centric solutions, Nirali combines technical proficiency with innovative thinking to push the boundaries of mobile app development.

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