Aforge.Net不会向VideoFileWriter添加框架

Question

我正在尝试使用Aforge.Net从网络摄像头拍摄电影。我的代码很简单，看起来像这样：

class SessionFirstTab extends React.Component {
    constructor() {
        super();
        this.state = { 
            session: null,
            statechanged: false
        };  
        this.handleChange = this.handleChange.bind(this);
        this.handleSubmit = this.handleSubmit.bind(this);
        this.getSessionData = this.getSessionData.bind(this)

    }

    componentDidMount() {
        this.getSessionData()
    }

    getSessionData() {
        var myHeaders = new Headers();
        myHeaders.append("Content-Type", 'application/x-www-form-urlencoded');
        myHeaders.append("x-access-token", 'eyJhbGciOiJIUzI1....');
        myHeaders.append("userid", "5904ab94835a710868d19fa2");
        myHeaders.append("id", this.props.sessionid);

        var myInit = { method: 'GET',
               headers: myHeaders,
               mode: 'cors',
               cache: 'default' };


       fetch('http://localhost:3000/api/session',myInit) 
      .then(function(response) {  
          if (response.status !== 200) {  
            console.log('Looks like there was a problem. Status Code: ' +  
              response.status); 
            return;  
          }
        //   Examine the text in the response  
         response.json().then(function(data) {  
         data => this.setState({session: data});

          });  
        }  
      )  
      .catch(function(err) {    
        console.log('Fetch Error', err);  
      });



    } //////////////END getSessionInfo


    handleChange(event) {
        const target = event.target;
        const value = target.type === 'checkbox' ? target.checked : target.value;
        const name = target.name;

        this.setState({ statechanged: true});
        this.setState({session: {[name]: value}});
    }


    handleSubmit(event) {
    // console.log(this.state.session.name);
        event.preventDefault();
    }



    render() {
        return (

     <article className="article">
    <h2 className="article-title">Edit Session </h2>

    <section className="box box-default">
      <div className="box-body padding-xl">

        <section className="box box-default">
          <div className="box-body no-padding">
           <Tabs>
    <Tab label="Properties" >
      <div style={styles}>

       <form role="form" onSubmit={this.handleSubmit}>





          <div className="divider divider-lg" />
    <div className="row">

      <div className="col-xl-6">
        <div className="box box-default">
          <div className="box-body">
            <div className="icon-box ibox-center">
              <div className="ibox-icon">
                <a href="javascript:;"><i className="material-icons">settings</i></a>
              </div>
              <h3>General</h3>
               <div className="form-group">
             <TextField name="name" id="name" hintText="Give this session a description" floatingLabelText="Name"  floatingLabelFixed defaultValue={this.state.session.name} onChange={this.handleChange}/><br />
          </div>

问题是在完成录制电影后，文件总是＆＃34;空＆＃34;，没有任何帧。它看起来像Aforge in＆＃34; FinalVideo_NewFrame＆＃34;事件函数不会向videoWriter添加任何帧。一切都应该没问题，因为我可以看到pictureBox1中的帧。你有任何线索可能有什么问题吗？