agora和mux都是实时音视频解决方案提供商，它们的主要区别在于技术实现和功能特点。对于Flutter上的实时音视频解决方案，建议使用Agora SDK和Flutter SDK进行集成。

以下是在Flutter中实时流式传输直播视频的代码示例：

1. 通过Agora SDK实现直播视频：

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

const appId = "";

class LiveScreen extends StatefulWidget {
  @override
  _LiveScreenState createState() => _LiveScreenState();
}

class _LiveScreenState extends State {

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

  void _initAgora() {
    AgoraRtcEngine.create(appId);
    AgoraRtcEngine.enableAudio();
    AgoraRtcEngine.enableVideo();
    AgoraRtcEngine.setChannelProfile(ChannelProfile.LiveBroadcasting);
    AgoraRtcEngine.setClientRole(ClientRole.Broadcaster);
    AgoraRtcEngine.joinChannel(null, "channel", null, 0);
  }

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Live Stream"),
      ),
      body: SingleChildScrollView(
        child: Center(
          child: Column(
            children: [
              SizedBox(height: 20),
              AgoraRenderWidget(0, local: true, preview: true),
              SizedBox(height: 20),
              Text("Local Stream", style: TextStyle(fontSize: 20)),
              SizedBox(height: 20),
              Text("Remote Stream", style: TextStyle(fontSize: 20)),
              SizedBox(height: 20),
              AgoraRenderWidget(0),
            ],
          ),
        ),
      ),
    );
  }
}

2. 通过Flutter SDK实现直播视频：

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

class LiveScreen