Flutter 无法显示视频

Question

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

void main() => runApp(VideoApp());
class VideoApp extends StatefulWidget {
@override
_VideoAppState createState() => _VideoAppState();
}
class _VideoAppState extends State<VideoApp> {
VideoPlayerController _controller;
@override
void initState() {
super.initState();
_controller = VideoPlayerController.network(
    'https://flutter.github.io/assets-for-api-docs/assets/videos/bee.mp4')
  ..initialize().then((_) {
    // Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.
    setState(() {});
  });
  }
@override
Widget build(BuildContext context) {
return MaterialApp(
  title: 'Video Demo',
  home: Scaffold(
    body: Center(
      child: _controller.value.isInitialized
          ? AspectRatio(
              aspectRatio: _controller.value.aspectRatio,
              child: VideoPlayer(_controller),
            )
          : Container(),
    ),
    floatingActionButton: FloatingActionButton(
      onPressed: () {
        setState(() {
          _controller.value.isPlaying
              ? _controller.pause()
              : _controller.play();
        });
      },
      child: Icon(
        _controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
      ),
    ),
  ),
);
 }
 @override
 void dispose() {
super.dispose();
_controller.dispose();
}
}

即使我尝试添加依赖项并将视频链接更改为 YouTube 链接，它仍然是相同的并且不显示视频。我可以知道如何解决这个问题吗？有一些错误，我列出如下：

1. 没有为类型“_VideoAppState”定义方法“VideoPlayer”
2. 未定义名称“VideoPlayerController”。
3. 未定义类“VideoPlayerController”。
4. URI 的目标不存在：'package:video_player/video_player.dart'

Pubspec.yml 下面

    name: icseat
description: A new Flutter 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:
  
  dio: ^4.0.0
  file_picker: ^4.0.0
  video_player:
  advance_pdf_viewer: ^2.0.0
  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
  http: ^0.13.0

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/logoicseat.png
    - images/person.png
  #   - images/a_dot_burr.jpeg
  #   - 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

@Tommie C. 以下是我在运行代码时遇到的错误：

Launching lib\View\Video.dart on sdk gphone x86 arm in debug mode...
Running Gradle task 'assembleDebug'...
√  Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...
Debug service listening on ws://127.0.0.1:57805/tl8ztZ-XWag=/ws
Syncing files to device sdk gphone x86 arm...
W/e.icseattestin( 4832): Accessing hidden method Landroid/media/AudioTrack;->getLatency()I (greylist, reflection, allowed)
I/ExoPlayerImpl( 4832): Init bda4bd9 [ExoPlayerLib/2.14.1] [generic_x86_arm, sdk_gphone_x86_arm, Google, 30]
I/Choreographer( 4832): Skipped 54 frames!  The application may be doing too much work on its main thread.
I/OpenGLRenderer( 4832): Davey! duration=921ms; Flags=0, IntendedVsync=313961916316, Vsync=314861916280, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=314868026700, AnimationStart=314868094000, PerformTraversalsStart=314871530500, DrawStart=314873232800, SyncQueued=314874438400, SyncStart=314875924800, IssueDrawCommandsStart=314875998400, SwapBuffers=314879263000, FrameCompleted=314885090400, DequeueBufferDuration=1230100, QueueBufferDuration=3509200, GpuCompleted=0, 
I/TetheringManager( 4832): registerTetheringEventCallback:com.example.icseattesting
I/VideoCapabilities( 4832): Unsupported profile 4 for video/mp4v-es
I/OMXClient( 4832): IOmx service obtained
D/SurfaceUtils( 4832): connecting to surface 0xe4d1c578, reason connectToSurface
I/MediaCodec( 4832): [OMX.android.goldfish.h264.decoder] setting surface generation to 4947969
D/SurfaceUtils( 4832): disconnecting from surface 0xe4d1c578, reason connectToSurface(reconnect)
D/SurfaceUtils( 4832): connecting to surface 0xe4d1c578, reason connectToSurface(reconnect)
E/ACodec  ( 4832): [OMX.android.goldfish.h264.decoder] setPortMode on output to DynamicANWBuffer failed w/ err -1010
I/ACodec  ( 4832): codec does not support config priority (err -1010)
D/SurfaceUtils( 4832): disconnecting from surface 0xe4d1c578, reason setNativeWindowSizeFormatAndUsage
D/SurfaceUtils( 4832): connecting to surface 0xe4d1c578, reason setNativeWindowSizeFormatAndUsage
D/SurfaceUtils( 4832): set up nativeWindow 0xe4d1c578 for 1280x720, color 0x13, rotation 0, usage 0x1002900
W/Gralloc4( 4832): allocator 3.x is not supported
Lost connection to device.

Answer 1

更新：

Nota Bene：在下面的示例中，您可以注释掉尝试加载 srt 字幕文件 (closedCaptionFile: _loadCaptions,) 的行。

将 pubspec.yaml 中的以下内容更改为 video_player: ^2.1.15

注意 - 另外，您是要在 iOS 还是 Android 上运行它？确保你打开 Runner.xcworkspace 文件并执行标准的 Xcode 例程。制作 确保 Runner 项目和 pods 项目可见。尝试 从终端运行flutter build ios。

然后重新运行 flutter pub get 或单击 UI 中的获取依赖项。我还会制作一个演示项目（存根 - flutter create --org com.yoursite stub01）并添加提供的示例以查看在线示例是否有效。

原创：

这是来自plugin website 的 video_player 的完整示例。您可以将其粘贴到您的环境中，以确保一切正常。您还应该确保按照设置步骤授予您的 iOS/Android 应用程序访问 Internet 的权限（请参阅网站自述文件部分的 installation notes）。我还要确保在您的终端上运行 flutter upgrade。

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// ignore_for_file: public_member_api_docs

/// An example of using the plugin, controlling lifecycle and playback of the
/// video.

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

void main() {
  runApp(
    MaterialApp(
      home: _App(),
    ),
  );
}

class _App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 3,
      child: Scaffold(
        key: const ValueKey<String>('home_page'),
        appBar: AppBar(
          title: const Text('Video player example'),
          actions: <Widget>[
            IconButton(
              key: const ValueKey<String>('push_tab'),
              icon: const Icon(Icons.navigation),
              onPressed: () {
                Navigator.push<_PlayerVideoAndPopPage>(
                  context,
                  MaterialPageRoute<_PlayerVideoAndPopPage>(
                    builder: (BuildContext context) => _PlayerVideoAndPopPage(),
                  ),
                );
              },
            )
          ],
          bottom: const TabBar(
            isScrollable: true,
            tabs: <Widget>[
              Tab(
                icon: Icon(Icons.cloud),
                text: "Remote",
              ),
              Tab(icon: Icon(Icons.insert_drive_file), text: "Asset"),
              Tab(icon: Icon(Icons.list), text: "List example"),
            ],
          ),
        ),
        body: TabBarView(
          children: <Widget>[
            _BumbleBeeRemoteVideo(),
            _ButterFlyAssetVideo(),
            _ButterFlyAssetVideoInList(),
          ],
        ),
      ),
    );
  }
}

class _ButterFlyAssetVideoInList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ListView(
      children: <Widget>[
        _ExampleCard(title: "Item a"),
        _ExampleCard(title: "Item b"),
        _ExampleCard(title: "Item c"),
        _ExampleCard(title: "Item d"),
        _ExampleCard(title: "Item e"),
        _ExampleCard(title: "Item f"),
        _ExampleCard(title: "Item g"),
        Card(
            child: Column(children: <Widget>[
          Column(
            children: <Widget>[
              const ListTile(
                leading: Icon(Icons.cake),
                title: Text("Video video"),
              ),
              Stack(
                  alignment: FractionalOffset.bottomRight +
                      const FractionalOffset(-0.1, -0.1),
                  children: <Widget>[
                    _ButterFlyAssetVideo(),
                    Image.asset('assets/flutter-mark-square-64.png'),
                  ]),
            ],
          ),
        ])),
        _ExampleCard(title: "Item h"),
        _ExampleCard(title: "Item i"),
        _ExampleCard(title: "Item j"),
        _ExampleCard(title: "Item k"),
        _ExampleCard(title: "Item l"),
      ],
    );
  }
}

/// A filler card to show the video in a list of scrolling contents.
class _ExampleCard extends StatelessWidget {
  const _ExampleCard({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  Widget build(BuildContext context) {
    return Card(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          ListTile(
            leading: const Icon(Icons.airline_seat_flat_angled),
            title: Text(title),
          ),
          ButtonBar(
            children: <Widget>[
              TextButton(
                child: const Text('BUY TICKETS'),
                onPressed: () {
                  /* ... */
                },
              ),
              TextButton(
                child: const Text('SELL TICKETS'),
                onPressed: () {
                  /* ... */
                },
              ),
            ],
          ),
        ],
      ),
    );
  }
}

class _ButterFlyAssetVideo extends StatefulWidget {
  @override
  _ButterFlyAssetVideoState createState() => _ButterFlyAssetVideoState();
}

class _ButterFlyAssetVideoState extends State<_ButterFlyAssetVideo> {
  late VideoPlayerController _controller;

  @override
  void initState() {
    super.initState();
    _controller = VideoPlayerController.asset('assets/Butterfly-209.mp4');

    _controller.addListener(() {
      setState(() {});
    });
    _controller.setLooping(true);
    _controller.initialize().then((_) => setState(() {}));
    _controller.play();
  }

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

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Column(
        children: <Widget>[
          Container(
            padding: const EdgeInsets.only(top: 20.0),
          ),
          const Text('With assets mp4'),
          Container(
            padding: const EdgeInsets.all(20),
            child: AspectRatio(
              aspectRatio: _controller.value.aspectRatio,
              child: Stack(
                alignment: Alignment.bottomCenter,
                children: <Widget>[
                  VideoPlayer(_controller),
                  _ControlsOverlay(controller: _controller),
                  VideoProgressIndicator(_controller, allowScrubbing: true),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _BumbleBeeRemoteVideo extends StatefulWidget {
  @override
  _BumbleBeeRemoteVideoState createState() => _BumbleBeeRemoteVideoState();
}

class _BumbleBeeRemoteVideoState extends State<_BumbleBeeRemoteVideo> {
  late VideoPlayerController _controller;

  Future<ClosedCaptionFile> _loadCaptions() async {
    final String fileContents = await DefaultAssetBundle.of(context)
        .loadString('assets/bumble_bee_captions.srt');
    return SubRipCaptionFile(fileContents);
  }

  @override
  void initState() {
    super.initState();
    _controller = VideoPlayerController.network(
      'https://flutter.github.io/assets-for-api-docs/assets/videos/bee.mp4',
     // closedCaptionFile: _loadCaptions(),
      videoPlayerOptions: VideoPlayerOptions(mixWithOthers: true),
    );

    _controller.addListener(() {
      setState(() {});
    });
    _controller.setLooping(true);
    _controller.initialize();
  }

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

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Column(
        children: <Widget>[
          Container(padding: const EdgeInsets.only(top: 20.0)),
          const Text('With remote mp4'),
          Container(
            padding: const EdgeInsets.all(20),
            child: AspectRatio(
              aspectRatio: _controller.value.aspectRatio,
              child: Stack(
                alignment: Alignment.bottomCenter,
                children: <Widget>[
                  VideoPlayer(_controller),
                  ClosedCaption(text: _controller.value.caption.text),
                  _ControlsOverlay(controller: _controller),
                  VideoProgressIndicator(_controller, allowScrubbing: true),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _ControlsOverlay extends StatelessWidget {
  const _ControlsOverlay({Key? key, required this.controller})
      : super(key: key);

  static const _examplePlaybackRates = [
    0.25,
    0.5,
    1.0,
    1.5,
    2.0,
    3.0,
    5.0,
    10.0,
  ];

  final VideoPlayerController controller;

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        AnimatedSwitcher(
          duration: Duration(milliseconds: 50),
          reverseDuration: Duration(milliseconds: 200),
          child: controller.value.isPlaying
              ? SizedBox.shrink()
              : Container(
                  color: Colors.black26,
                  child: Center(
                    child: Icon(
                      Icons.play_arrow,
                      color: Colors.white,
                      size: 100.0,
                    ),
                  ),
                ),
        ),
        GestureDetector(
          onTap: () {
            controller.value.isPlaying ? controller.pause() : controller.play();
          },
        ),
        Align(
          alignment: Alignment.topRight,
          child: PopupMenuButton<double>(
            initialValue: controller.value.playbackSpeed,
            tooltip: 'Playback speed',
            onSelected: (speed) {
              controller.setPlaybackSpeed(speed);
            },
            itemBuilder: (context) {
              return [
                for (final speed in _examplePlaybackRates)
                  PopupMenuItem(
                    value: speed,
                    child: Text('${speed}x'),
                  )
              ];
            },
            child: Padding(
              padding: const EdgeInsets.symmetric(
                // Using less vertical padding as the text is also longer
                // horizontally, so it feels like it would need more spacing
                // horizontally (matching the aspect ratio of the video).
                vertical: 12,
                horizontal: 16,
              ),
              child: Text('${controller.value.playbackSpeed}x'),
            ),
          ),
        ),
      ],
    );
  }
}

class _PlayerVideoAndPopPage extends StatefulWidget {
  @override
  _PlayerVideoAndPopPageState createState() => _PlayerVideoAndPopPageState();
}

class _PlayerVideoAndPopPageState extends State<_PlayerVideoAndPopPage> {
  late VideoPlayerController _videoPlayerController;
  bool startedPlaying = false;

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

    _videoPlayerController =
        VideoPlayerController.asset('assets/Butterfly-209.mp4');
    _videoPlayerController.addListener(() {
      if (startedPlaying && !_videoPlayerController.value.isPlaying) {
        Navigator.pop(context);
      }
    });
  }

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

  Future<bool> started() async {
    await _videoPlayerController.initialize();
    await _videoPlayerController.play();
    startedPlaying = true;
    return true;
  }

  @override
  Widget build(BuildContext context) {
    return Material(
      elevation: 0,
      child: Center(
        child: FutureBuilder<bool>(
          future: started(),
          builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
            if (snapshot.data == true) {
              return AspectRatio(
                aspectRatio: _videoPlayerController.value.aspectRatio,
                child: VideoPlayer(_videoPlayerController),
              );
            } else {
              return const Text('waiting for video to load');
            }
          },
        ),
      ),
    );
  }
}