[Flutter] video_playerで複数音声、動画再生の対処法

video_player

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(() {});
      })
      ..addListener(() {
        print('Is playing: ${videoPlayerController.value.isPlaying}');
      });
  }

  @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();
  }
}

一つの画面で複数VideoPlayerController使って、音声、動画を再生すると、先に再生する_controllerのaddListenerはあとで再生する_controllerは前を上書きされる。
addListenerの戻り値がおかしくなる

解决方法

VideoPlayerOptions.mixWithOthers追加する
違うVideoPlayerControllerは同時再生しても、上書はされるない、音声がmixされる

    _controller = VideoPlayerController.network(
        'https://flutter.github.io/assets-for-api-docs/assets/videos/bee.mp4')
          videoPlayerOptions: VideoPlayerOptions(mixWithOthers: true),
        )..initialize().then((_) {