需要装依赖：

  gallery_saver: ^2.3.2video_player: ^2.8.3

实现代码

import 'dart:async';
import 'dart:io';import 'package:flutter/material.dart';
import 'package:gallery_saver/gallery_saver.dart';
import 'package:path_provider/path_provider.dart';
import 'package:video_player/video_player.dart';
import 'package:http/http.dart' as http;void main() => runApp(const VideoApp());class VideoApp extends StatefulWidget {const VideoApp({super.key});@override_VideoAppState createState() => _VideoAppState();
}class _VideoAppState extends State<VideoApp> {late VideoPlayerController _controller;bool isMuted = false;double _currentSliderValue = 0.0;Timer? _timer;double _playbackSpeed = 1.0;@overridevoid initState() {super.initState();_controller = VideoPlayerController.networkUrl(Uri.parse('你的播放地址'))..initialize().then((_) {setState(() {});});_controller.setLooping(true);_controller.play();_timer = Timer.periodic(Duration(seconds: 1), (Timer timer) {if (_controller.value.isPlaying) {setState(() {_currentSliderValue = _controller.value.position.inMilliseconds.toDouble();});}});}Future<void> downloadAndSaveVideo(String url) async {var httpClient = http.Client();var response = await httpClient.get(Uri.parse(url));var bytes = response.bodyBytes;var tempDir = await getTemporaryDirectory();var tempFile = File('${tempDir.path}/temp_video.mp4');await tempFile.writeAsBytes(bytes);final result = await GallerySaver.saveVideo(tempFile.path);print('Video saved to gallery: $result,path: ${tempFile.path}');}@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Video Demo',home: Scaffold(appBar: AppBar(title: Text('Video Demo'),),body: Center(child: Column(mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[_controller.value.isInitialized? AspectRatio(aspectRatio: _controller.value.aspectRatio,child: VideoPlayer(_controller),):const  CircularProgressIndicator(),const SizedBox(height: 5),ElevatedButton(onPressed: () {setState(() {isMuted = !isMuted;_controller.setVolume(isMuted ? 0.0 : 1.0);});},child: Text(isMuted ? '静音模式' : '开启声音模式'),),ElevatedButton(onPressed: () {setState(() {if (_controller.value.isPlaying) {_controller.pause();} else {_controller.play();}});},child: Text(_controller.value.isPlaying ? '暂停' : '播放'),),Slider(value: _currentSliderValue,min: 0.0,max: _controller.value.duration.inMilliseconds.toDouble(),onChanged: (double value) {setState(() {_currentSliderValue = value;_controller.seekTo(Duration(milliseconds: value.toInt()));});},),const SizedBox(height: 5),Text('Playback Speed: ${_playbackSpeed.toStringAsFixed(1)}x'),Slider(value: _playbackSpeed,min: 0.5,max: 2.0,divisions: 15,label: '${_playbackSpeed.toStringAsFixed(1)}x',onChanged: (double value) {setState(() {_playbackSpeed = value;_controller.setPlaybackSpeed(_playbackSpeed);});},),ElevatedButton(onPressed: () {downloadAndSaveVideo(_controller.dataSource);},child: Text('下载'),),],),),),);}@overridevoid dispose() {super.dispose();_controller.dispose();_timer?.cancel();}
}