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• How can I stream a video from localhost to web browser using the video tag ?

  3 septembre 2021, par kup

  Basically what I want to stream a video to my browser both on localhost, using Flask, OpenCV, or FFmpeg.

  


  But I am not sure how to do it.

  


  I tried this :

  


  #!/usr/bin/env python
from flask import Flask, render_template, Response
import cv2
import sys
import numpy

app = Flask(__name__)

def get_frame():
    c=cv2.VideoCapture("output.mkv")

    while True:
        retval, im = c.read()
        imgencode=cv2.imencode('.jpg',im)[1]
        stringData=imgencode.tostring()
        yield (b'--frame\r\n'
            b'Content-Type: text/plain\r\n\r\n'+stringData+b'\r\n')

    del(c)

@app.route('/vid')
def vid():
     return Response(get_frame(),mimetype='multipart/x-mixed-replace; boundary=frame')


if __name__ == '__main__':
    app.run(host='localhost',port=5000, debug=True, threaded=True)


  


  But it's not working. Maybe because it is sending images. How can I stream video ?

  


• Keep getting WIN32Exception when running FFMPEG in ASP.NET project

  23 octobre 2014, par Lance Bloom

  I have an ASP.NET project and I want to use FFMPEG to help create thumbails for my videos. I’ve loaded FFMPEG into the project, and whenever I run my code I get the same error :

  ’ffmpeg.MainModule’ threw an exception of type ’System.ComponentModel.Win32Exception’
  "A 32 bit processes cannot access modules of a 64 bit process."

  I’m using VS 2013, and I’ve set my target platform to x86, and made 100% sure I am using the 32bit version of ffmpeg. I’m using the static libraries from this site (http://ffmpeg.zeranoe.com/builds/) I also tried to change the target platform to All CPUs or x64, and tried with both 32 and 64 bit versions of FFMPEG. Always the same error. I am running IIS Express when I test in my local environment.

  Here is my code. Would appreciate any help !

  String vSource = "http://example.com/myvideo.mp4";
  
  String path1 = HttpContext.Current.Request.PhysicalApplicationPath;
  
  
  
  Process ffmpeg = new Process();
  
  ProcessStartInfo startinfo = new ProcessStartInfo(HostingEnvironment.MapPath("~/App_Data/exe/ffmpeg.exe"), "-i " + vSource + "-ss 00:00:05.000 -f image2 -vframes 1 " + path1 +"thumbnail1.jpg");
  
  
  
  startinfo.RedirectStandardError = true;
  
  startinfo.RedirectStandardOutput = true;
  
  startinfo.RedirectStandardInput = true;
  
  startinfo.UseShellExecute = false;
  
  startinfo.CreateNoWindow = true;
  
  ffmpeg.StartInfo = startinfo;
  
  
  
  ffmpeg.Start();

• Adding an image overlay to a video using C# and ffmpeg.exe

  14 juillet 2023, par hello world

  I'm working on a project where I need to add an image overlay to a video using C# and ffmpeg.exe. I want to place the image at a specific position on the video and make sure it remains visible throughout the entire duration of the video. Can someone guide me on how to achieve this using the ffmpeg library in conjunction with C# ?

  


  I've looked into the documentation, but I couldn't find a straightforward example that demonstrates how to accomplish this task programmatically. Specifically, I'm interested in :

  


  

  1. How to specify the position and size of the image overlay on the video.

  


  2. How to ensure the image stays visible throughout the duration of the video, even if the video has varying resolutions or aspect ratios.

  


  3. How to execute the ffmpeg command from C# code and capture any potential error messages or status updates.
If anyone has experience with using C# and ffmpeg.exe to add image overlays to videos, your insights and code examples would be greatly appreciated. Thank you !

  


  


  Edit :
Here is my code :

  


          private async void button6_Click(object sender, EventArgs e)
        {
            ProcessStartInfo startInfo = new ProcessStartInfo
            {
                FileName = "ffmpeg.exe",
                Arguments = $"-f lavfi -i nullsrc -t 1 -s {pictureBox2.Width}x{pictureBox2.Height} -r 30 -c:v libx264 {"file.mp4"}",
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                CreateNoWindow = true
            };

            using (Process process = new Process())
            {
                process.StartInfo = startInfo;
                process.Start();
                process.WaitForExit();
            }
            render = true;
            await Task.Run(() =>
            {
                for (int i = 0; i < 10; i++)
                {
                    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 startInfo = new ProcessStartInfo
                    {
                        FileName = "ffmpeg.exe",
                        Arguments = $"-i file.mp4 -i a.jpg -filter_complex \"[0:v][1:v] overlay=25:25:enable='between(t,0,20)'\" -pix_fmt yuv1080p -c:a copy file.mp4",
                        UseShellExecute = false,
                        RedirectStandardOutput = true,
                        RedirectStandardError = true,
                        CreateNoWindow = true
                    };

                    using (Process process = new Process())
                    {
                        process.StartInfo = startInfo;
                        process.Start();
                        process.WaitForExit();
                    }
                }
            });
            File.Delete("a.jpg");
        }