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• How to make RedirectStandardOutput sends output while the process is running (realtime)

  19 février 2017, par Wayne

  I have this simple GUI for ffmpeg video convertion I made using VS2015 (visual basic)

  So far everything works except for the status text box where I want the current status to show while the conversion process is at work.

  Here is the code where I tried to capture the status

  'LET'S GET READY TO CONVERT
  
  ConvertProcessInfo.FileName = theApp
  
  ConvertProcessInfo.Arguments = theOptions
  
  
  
  'LET'S TRY TO CAPTURE STATUS
  
  ConvertProcessInfo.RedirectStandardError = True
  
  ConvertProcessInfo.RedirectStandardOutput = True
  
  ConvertProcessInfo.UseShellExecute = False
  
  ConvertProcessInfo.CreateNoWindow = True
  
  
  
  procFFMPEG.StartInfo = ConvertProcessInfo
  
  
  
  'LET'S CONVERT
  
  procFFMPEG.Start()
  
  
  
  Dim theStat As StreamReader = procFFMPEG.StandardError
  
  Dim theStatOut As String = theStat.ReadToEnd()
  
  txtProcessInfo.Text = theStatOut
  
  
  
  'LET'S WAIT FOR PROCESS TO EXIT
  
  procFFMPEG.WaitForExit()

  The problem, my status textbox only gets the status after the conversion is done, not during conversion. Only last/final status is returned.

• Issue with creating an empty video and adding images using FFmpeg in C#

  14 juillet 2023, par hello world

  I'm working on a C# project where I need to create an empty video file and then add images to it using FFmpeg. However, the code I have implemented doesn't seem to be working as expected.

  


  Here's the code snippet I have :

  


  using System;
using System.Diagnostics;
using System.Drawing;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace VideoProcessingApp
{
    public partial class MainForm : Form
    {
        private bool render = false;

        public MainForm()
        {
            InitializeComponent();
        }

        private async void button6_Click(object sender, EventArgs e)
        {
            ProcessStartInfo createVideoInfo = new ProcessStartInfo
            {
                FileName = "ffmpeg.exe",
                Arguments = $"-f lavfi -i nullsrc -t 10 -s {pictureBox2.Width}x{pictureBox2.Height} -r 30 -c:v libx264 output.mp4",
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                CreateNoWindow = true
            };

            using (Process createVideoProcess = new Process())
            {
                createVideoProcess.StartInfo = createVideoInfo;
                createVideoProcess.Start();

                render = true;
                await Task.Run(() =>
                {
                    for (int i = 0; i < 10; i++)
                    {
                        if (!render)
                            break;

                        Bitmap bmp = new Bitmap(1, 1);
                        pictureBox1.Invoke((MethodInvoker)(() =>
                        {
                            bmp = (Bitmap)pictureBox1.Image.Clone();
                        }));

                        while (bmp == pictureBox1.Image)
                        {
                            Thread.Sleep(10);
                        }

                        bmp.Save("a.jpg");

                        ProcessStartInfo addImageInfo = new ProcessStartInfo
                        {
                            FileName = "ffmpeg.exe",
                            Arguments = $"-i output.mp4 -i a.jpg -filter_complex \"overlay=10:10\" -c:v libx264 -c:a copy -f mp4 -",
                            UseShellExecute = false,
                            RedirectStandardOutput = true,
                            RedirectStandardError = true,
                            RedirectStandardInput = true,
                            CreateNoWindow = true
                        };

                        using (Process addImageProcess = new Process())
                        {
                            addImageProcess.StartInfo = addImageInfo;
                            addImageProcess.Start();

                            addImageProcess.WaitForExit();
                        }
                    }
                });
            }

            File.Delete("a.jpg");
        }
    }
}


  


  In this code, I'm attempting to create an empty video by executing an FFmpeg command to generate a nullsrc video. Then, I'm using a loop to capture images from a PictureBox control and overlay them onto the video using FFmpeg.

  


  The issue I'm facing is that the video is not being created at all. I have verified that FFmpeg is installed on my system and the paths to the FFmpeg executable are correct.

  


  I would appreciate any insights or suggestions on what could be causing this issue and how to resolve it. Thank you !

  


• openCV connect and process an ip camera stream (rtsp protocol)

  12 mai 2020, par aviram_Piletzki

  i am trying to connect and process a video stream from my ip camera
i am using 360Eye(s) camera.

  



  this is my code trying to connect :

  



  import cv2
cap = cv2.VideoCapture('rtsp://admin:123456@192.168.0.333')
while True:
    ret, img = cap.read()
    if ret == True:
        cv2.imshow('video output', img)
        k = cv2.waitKey(10)& 0xff
        if k == 27:
            break
cap.release()
cv2.destroyAllWindows()


  



  and i never get inside the if statment