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• Dailymotion Video Url to Audio Downloader

  27 août 2020, par Maisum Abbas

  I am trying to create Dailymotion Video URL to Audio Downloader. Since I have to deploy it on Firebase, I will have to use JavaScript, hence node.js. I have tried various approaches by following different links but didn't find anything that works for me. Most of them are based on terminal from where they can run which I don't require including ffmpeg. One ffmpeg tutorial I found was based on uploading videos and then converting it to audio which didn't work with the URL. Also, I didn't find any code from where I can use or read to manage ffmpeg in code, just found the guide of how to use it in terminal. So can anyone guide me where I can get a useful link that can help me. I have tried on GitHub as well. Really hoping to get help from here.

  


• How to kill command Exec in difference Function in Golang

  26 juillet 2022, par Tammam

  i'm making screen record web based using command exec to run FFMPEG. here I created a startRecording function but I am still confused about stopping the command process in the stopRecording function, because the command is executed in the startRecording function. How to stop a process that is already running in the srartRecording function in the stopRecording function ?

  


  here my code

  


  //Handler to create room/start record
func RoomCreate(c *fiber.Ctx) error {
    fileName := "out.mp4"
    fmt.Println(fileName)
    if len(os.Args) > 1 {
        fileName = os.Args[1]
    }

    

    errCh := make(chan error, 2)
    ctx, cancelFn := context.WithCancel(context.Background())
    // Call to function startRecording
    go func() { errCh <- startRecording(ctx, fileName) }()

    go func() {
        errCh <- nil
    }()
    err := <-errCh
    cancelFn()
    if err != nil && err != context.Canceled {
        log.Fatalf("Execution failed: %v", err)
    }
    
    return c.Redirect(fmt.Sprintf("/room/%s", guuid.New().String()))
}



//Function to run command FFMPEG
func startRecording(ctx context.Context, fileName string) error {
    ctx, cancelFn := context.WithCancel(ctx)
    defer cancelFn()
    // Build ffmpeg
    ffmpeg := exec.Command("ffmpeg",
        "-f", "gdigrab",
        "-framerate", "30",
        "-i", "desktop",
        "-f", "mp4",
        fileName,
    )
    // Stdin for sending data
    stdin, err := ffmpeg.StdinPipe()
    if err != nil {
        return err
    }
    //var buf bytes.Buffer
    defer stdin.Close()
    // Run it in the background
    errCh := make(chan error, 1)

    go func() {
        fmt.Printf("Executing: %v\n", strings.Join(ffmpeg.Args, " "))
        
        if err := ffmpeg.Run(); err != nil {
            return
        }
        //fmt.Printf("FFMPEG output:\n%v\n", string(out))
        errCh <- err
    }()
    // Just start sending a bunch of frames
    for {
        
        // Check if we're done, otherwise go again
        select {
        case <-ctx.Done():
            return ctx.Err()
        case err := <-errCh:
            return err
        default:
        }
    }
}

//Here function to stop Recording
func stopRecording(ctx context.Context) error {
//Code stop recording in here
} 


  


  Thanks for advance

  


• whats the difference between “&” and multiple terminals in Linux Multiprocessing [closed]

  11 mai 2022, par Ma XIaoyu

  I am using Linux for multi-task processing. Specifically, calling ffmpeg multiple times to transcoding multi source videos.

  


  Strangely, when I am using :
“
ffmpeg-cmds01 &
ffmpeg-cmds02 &
ffmpeg-cmds03 &
……
”
The ffmpeg process often get errors and stop after a few hours.

  


  However, if I open several terminals and using each terminal for only one ffmpeg cmd( i.e., terminal#1 only run ffmpeg-cmd01 ; ternimal#2 only for ffmpeg-cmd02, etc.) The transcoding procedure can last for dozens of days and no errors are reported.

  


  Could anyone kindly help us to analysis what’s there differences ? Opening multiple terminals is too difficult for managing especially when the number of video streams are up to 300+.

  


  Thanks a lot for help !