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• QCamera switch input pin number

  14 décembre 2017, par Preonix

  I have chinese video grabber which should work with my program. It has 2 connection variants : S-VIDEO and COMPOSITE.

  In native program bundled with this hardware I can switch input source from s-video to composite and vice versa. But I need to do it in my programm and I’ve founded solution with the help of FFMPEG. Just switch pin_number and that’s it. No need to know driver API of hardware.

  Another problem is that I can not attach this library to my CMAKE project, and I just thought that Qt could has some "switch pin_number" aswell, but I cant find anything useful in qt-docs.

  Thanks for any advices and sorry for my english, cheers !

• 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

  


• Revision 99981 : Sur Opera 40 sous Windows 10, ça provoquait un « Uncaught ...

  20 octobre 2016, par real3t@… — Log

  Sur Opera 40 sous Windows 10, ça provoquait un « Uncaught ReferenceError ? : tableau_sites is not defined » qui rendait les boutons calculer inutiles.