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• FFMPEG : Drawtext filter with word wrapping support [duplicate]

  18 août 2018, par Software Development Consultan

  This question already has an answer here :

  • FFMPEG : Creating video using drawtext along with word wrap and padding
    
    1 answer
    

  I need to draw max two line text at top of some backgroud. I need to wrap that text if that is longer. Text will be horizontal center align.

  I have tried and use DrawText filter but not able to find way to use text wrap automatically.

  Some developers suggesting to use subtitle but this is not related to video so I want to check with Drawtext if possible.
  Draw text using Subtitle filter

  Can someone please guide how we can achieve this ?

  Thank you.

• Remove Video background in ffmpeg-python

  22 juillet 2022, par Billi Alt

  Is there a way in ffmpeg-python to remove a single colored green screen background and to replace it with another video ?

  


  So I have a video "test.mp4". It is basically a man talking in front of a green screen. I would like to add multiple background videos. One from second 0-5 the next from second 5-15 and so on.

  


  The green screen is only one color so no shadows or anything else just one single green color. Is there a way to remove the green screen in ffmpeg-python or an other python library ?

  


• How to record screen using FFMPEG in Background and Stop It

  23 juillet 2022, par Tammam

  I'm making a video meeting application and implementing from this repository https://github.com/boratanrikulu/quik.do and I will make a screen record if I access the room/create room server side using FFMPEG. but I have a problem because after I access the FFMPEG command, the command does not run in the background so the handler to access the room does not run. I will also make a function to stop recording that does not affect the application (the application will still run)

  


  here my code

  


  func RoomCreate(c *fiber.Ctx) error {
    fileName := "out.mp4"
    fmt.Println(fileName)
    if len(os.Args) > 1 {
        fileName = os.Args[1]
    }
    // Record to video and wait for enter key asynchronously
    fmt.Printf("Starting...press enter to exit...")
    errCh := make(chan error, 2)
    ctx, _ := context.WithCancel(context.Background())
    // Record
    go func() { errCh <- recordToVideo(ctx, fileName) }()
    

    //The following program from FFMPEG will stop if you press enter, and will wait here so it doesn't enter create room
    // Wait for enter
    go func() {
        fmt.Scanln()
        errCh <- nil
    }()
    err := <-errCh
    //cancelFn()
    if err != nil && err != context.Canceled {
        log.Fatalf("Execution failed: %v", err)
    }
    // Wait a bit...
    //time.Sleep(4 * time.Second)
    return c.Redirect(fmt.Sprintf("/room/%s", guuid.New().String()))
}

func recordToVideo(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",
        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, " "))
        //Here if
        out, err := ffmpeg.CombinedOutput()
        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:
        }
    }
}


  


  How do I get the command to run in the background ? and how to stop recording without stopping the application ?