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• Uncaught Exception : TypeError : Cannot read properties of undefined (reading 'format')

  19 mai 2024, par gzhe1056

  I've been having trouble with sending the video files to be read by ffprobe. I have fluent-ffmpeg and ffprobe installed but this error shows. I'm not sure what I'm missing

  


  index.js

  


  const electron = require('electron')
const {app, BrowserWindow, ipcMain} = electron
const ffmpeg = require('fluent-ffmpeg')
let mainWindow
// const ffmpeg = require('@ffmpeg-installer/ffmpeg');
// app.on('ready', function(){
//     console.log('App is ready')
// })
app.on('ready', function(){
    mainWindow = new BrowserWindow({
        webPreferences:{
            nodeIntegration: true,
            contextIsolation: false
        }
    })
    mainWindow.loadURL(`file://${__dirname}/index.html`)
})

ipcMain.on('video:submit', (event, path)=>{
    ffmpeg.ffprobe(path, (err, metadata)=>{
        let duration = metadata.format.duration
        console.log(err)
        mainWindow.webContents.send(
            'video:metadata',
            duration
        )
    })
})


  


  index.html

  


  &#xA;&#xA;&#xA;&#xA;    <h1>Video info</h1>&#xA;    <form>&#xA;        <div>&#xA;            <label>Select new video</label>&#xA;            <input type="file" accept="video/*" />&#xA;        </div>&#xA;        <input type="submit" value="Get info" />&#xA;    </form>&#xA;    <h1></h1>&#xA;    <code class="echappe-js">&lt;script&gt;&amp;#xA;        const electron = require(&amp;#x27;electron&amp;#x27;)&amp;#xA;        const {ipcRenderer} = electron&amp;#xA;        document.querySelector(&amp;#x27;form&amp;#x27;).addEventListener(&amp;#x27;submit&amp;#x27;, (event)=&gt;{&amp;#xA;            event.preventDefault()&amp;#xA;            const {path} = document.querySelector(&amp;#x27;input&amp;#x27;).files[0]&amp;#xA;            ipcRenderer.send(&amp;#x27;video:submit&amp;#x27;, path)&amp;#xA;        })&amp;#xA;&amp;#xA;        ipcRenderer.on(&amp;#x27;video:metadata&amp;#x27;, (event,duration)=&gt;{&amp;#xA;            document.querySelector(&amp;#x27;#result&amp;#x27;).innerHTML =  `Video duration is ${duration} seconds`&amp;#xA;        })&amp;#xA;    &lt;/script&gt;&#xA;&#xA;

  


  I tried to reinstall and udpate the ffmpeg nodes but the error still persists

  


• C# FFmpeg bitmap frames to picturebox

  8 janvier 2019, par Denniss

  I have an existing C# winforms app with live videostreams from 4 ip cameras via VLC.net (rtsp) and we take every 100ms a snapshot to analize. This is working fine. Now we like to do this instead of VLC.net with FFmpeg to have more possibilities with the (faster) captured frame. I have already a working ffmpeg wrapper sending every frame as bitmap via an event. Then I have a class "FmpegVideoWindow" inherits from PictureBox, here we listen for incoming frames and draw them on the picturebox. So instead of using the vlc-control in the form we use now a picturebox :

   private void ffMpegWrapper_NewFrame1(object sender, NewFrameEventArgs e)
  
      {
  
  
  
          if (e != null)
  
          {                
  
  
  
              try
  
              {                   
  
  
  
                  using (Bitmap bm = new Bitmap(e.Frame))
  
                  {
  
                      frame = (Bitmap)bm.Clone();                                              
  
  
  
                  }
  
              }
  
              catch
  
              {
  
              }               
  
  
  
          }
  
  
  
          Invalidate();
  
      }
  
  
  
      protected override void OnPaint(PaintEventArgs pe)
  
      {
  
          base.OnPaint(pe);
  
          if (frame != null)
  
          {
  
              pe.Graphics.DrawImage(frame, 0, 0, this.Width, this.Height);
  
             //todo : disposing frame
  
          }
  
  
  
      }

  This is working ok to see the cameras live, they have @25fps and a D1 resolution 704*576.
  The problem is that every time we have other processing like opening a (settings)form, or analyzing the snapshot, the picture in the picturebox is freezing for a short time. The same program with VLC.net was never a problem.

  The Ffmpeg process is done in another thread. Why does the VLC.net control running smooth in the GUI thread, and this new approach not ? And what can we do to fix it ? The analyzing is also done in another thread, writing the results from the analyzer to the database is done in the GUI thread. And I don’t like to change that because with VLC.net it was also not needed to do that.
  Thank you in advance.

• FFmpeg audio problems

  9 juin 2017, par temp account

  Main question is, im not getting audio when the bat file first downloads the video, it only gets the video and not the audio

  Here is my code for my bat file that gets a youtube video URL from their servers via youtube-dl.exe

  It then moves that URL to FFmpeg.exe to download the video.

  @ECHO off
  
  
  
  :Input
  
  ECHO.
  
  SET url=
  
  ECHO Enter Youtube-url:
  
  SET /P url=
  
  IF "%url%" EQU "" GOTO End
  
  IF "%url: =%" NEQ "%url%" GOTO Input
  
  ECHO Enter start time (in seconds, or in hh:mm:ss[.xxx] form):
  
  SET /P start=
  
  ECHO Enter duration (in seconds, or in hh:mm:ss[.xxx] form):
  
  SET /P dur=
  
  ECHO.
  
  FOR /F "delims==" %%A IN ('youtube-dl.exe --no-warnings --get-filename "%url%"') DO SET filename=%%A
  
  FOR /F %%B IN ('youtube-dl.exe -g "%url%"') DO (
  
  ffmpeg.exe -hide_banner -ss "%start%" -i "%%B" -c:v copy -c:a aac -strict experimental -t "%dur%" "%filename%"
  
  )
  
  GOTO Input
  
  
  
  :End

  This is the main part of the bat file thats probably responsible for my audio problem

  ffmpeg.exe -hide_banner -ss "%start%" -i "%%B" -c:v copy -c:a aac -strict experimental -t "%dur%" "%filename%"

  When the video is done downloading, it will ask me

  File 'whatever_video_is_called.mp4' already exists. Overwrite ? [y/N]

  and then it will overwrite the video I just downloaded with its audio file.