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• Grabbing a single image from a MS VS .NET 6.0 C# WPF process always returns the same image

  12 mai 2023, par Wolfgang Kurz

  I am trying to develop a MS VS .NET 6.0 C# WPF application to digitize my Super 8 cine films. To grab the frames of the film I want to use FFMPEG because Accord.NET6.0 DirectShow does not work under MS VS 2022 .
I use
FFmpeg 64-bit static Windows build from www.gyan.dev
Version : 2022-09-29-git-8089fe072e-full_build-www.gyan.dev

  


  FFMPEG is invoked from a Process in ma application whicch sets the process FFMPEG start parameters. The webcam parameter is "USB Webcam" ( digital Celestron handheld microscope connected via USB - is DirectShow compatible )
The video resolution parameter "camRes" is "1280x960"

  


  public void UpdateImage(string aString)
    {
        string startPath = "C:" + MainWindow.bSl + "ffmpeg" + MainWindow.bSl + "bin" + MainWindow.bSl + "ffmpeg.exe ";

        MainWindow.aResult = "";
        System.Drawing.Bitmap result;
        ProcessStartInfo psi;
        psi = new ProcessStartInfo();
        psi.FileName = startPath;
        string targPath;
        psi.Arguments = "-f dshow -video_size" + MainWindow.dQuote + webCam + MainWindow.dQuote +
             " -framerate 10  -i video=" + MainWindow.dQuote + camRes + MainWindow.dQuote +
            " -frames:v 1 test%3d.bmp -update 1";
        string errors = "";
        string results = "";
        psi.CreateNoWindow = false;
        psi.RedirectStandardOutput = true;
        psi.RedirectStandardError = true;
        psi.WindowStyle = ProcessWindowStyle.Normal;
        psi.WorkingDirectory = "C:" + MainWindow.bSl + "ffmpeg" + MainWindow.bSl + "bin" + MainWindow.bSl;

        using (Process theProcess = new Process())
        {
            theProcess.StartInfo = psi;
            theProcess.Start();

            theProcess.WaitForExit();
            while (theProcess.HasExited == false)
            {
                Thread.Sleep(50);
            }
            Thread.Sleep(50);

            try
            {
                if (File.Exists(pathCI) == true)
                {
                    DefineImage.ffmpegRes = new Bitmap(pathCI);
                    MainWindow.actMWInstance.UpdateMessage(DateTime.Now +
                        "- Old image disposed, new image grabbed");
                    File.Delete(pathCI);
                }
            }
            catch (System.Exception ex)
            {
                MainWindow.actMWInstance.UpdateMessage(DateTime.Now + "Image grabbing failed");
            }
            theProcess.Close();
            theProcess.Dispose();
        }

        if (aString.Length == 0)
        {
            File.Delete(pathCI);
            MainWindow.actMWInstance.DoMove("200", "0", true);
        }
        if (ffmpegRes != null)
        {
            BitmapSource aBMPSrc = BitmapConversion.ToWpfBitmap(ffmpegRes);
            IMGFrame.Source = aBMPSrc;
        }
        Show();
    }


  


  The attached screenshot shows the expected GUI content.
https://www.wkurz.com/wkurz/images/FFMPEGTEST.jpg

  


  My problem now is, when I try to refresh the image in the DefineDialog window, I always get the same image although the film has been moved by one frame.

  


  Is the first image cached by FFMPEG and always used again with the provided parameters.

  


  How to force FFMPEG to replace the image with a new one.

  


  ---

  


  -----------------------------------------------------------------------+this is additional information to the question.
I have managed to grab the film frame but still get always the same image during a session :*

  


  

  


  It is obvious that the cine film frame has been successfully grabbbed.
The next step should be to work at the image ( correct brightness contrast, gama and colors) and then store the evaluated correction values that have later to be applied to the frames during a batch process, which automatically transports the film, grabs the frames and corrects the colors and then stores the frames as consecutively numbered images which than can be used to generate a video with FFMPEG :

  


  Now the problem I cannot overcome :

  


  In the definition dialog there are 2 buttons ( Refresh and New Image). The intension is to reread / regrab a frame, if the current frame is not optimal to evaluate the correction values.

  


  Whenever I click one of the buttons FFMPEG seems to grab an image, but FFMPEG provides always the same (identcial to the first already available image) to the caller ( a .NET C# Process in my proggram).

  


  The output stream is a single jpg image ( test%04d.jpg ) in a specified target library . Here follows the generated output which seem to be OK according to my knowledge.

  


  I want to ask all interested persons to look over this provided information - may be someone has an idea, what causes the fact, that FFMPEG 6.0 van Neumann always delivers the first image grabbed. in a session.
It seems that there is something cached and reused over and over again.

  


  DefImg 147: UpdateImage started ( Lines starting with DefImg or DefineImage are test output statements provided by the C# program)


  


  DefineImage 155 11.05.2023 17:53:20 C :\ffmpeg\bin\ffmpeg.exe -y -nostdin -f dshow -an -video_size 1280x960 -framerate 10 -i video="USB Microscope" -filter:v "smartblur=luma_radius=0.9:luma_strength=0.7:luma_threshold=0" -frames:v 1 C :\FilmProjList\TEST\TEST%%04d.jpg -update 1
DefineImage 180 ffmpeg version 6.0-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
configuration : —enable-gpl —enable-version3 —enable-static —disable-w32threads —disable-autodetect —enable-fontconfig —enable-iconv —enable-gnutls —enable-libxml2 —enable-gmp —enable-bzlib —enable-lzma —enable-libsnappy —enable-zlib —enable-librist —enable-libsrt —enable-libssh —enable-libzmq —enable-avisynth —enable-libbluray —enable-libcaca —enable-sdl2 —enable-libaribb24 —enable-libdav1d —enable-libdavs2 —enable-libuavs3d —enable-libzvbi —enable-librav1e —enable-libsvtav1 —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs2 —enable-libxvid —enable-libaom —enable-libjxl —enable-libopenjpeg —enable-libvpx —enable-mediafoundation —enable-libass —enable-frei0r —enable-libfreetype —enable-libfribidi —enable-liblensfun —enable-libvidstab —enable-libvmaf —enable-libzimg —enable-amf —enable-cuda-llvm —enable-cuvid —enable-ffnvcodec —enable-nvdec —enable-nvenc —enable-d3d11va —enable-dxva2 —enable-libvpl —enable-libshaderc —enable-vulkan —enable-libplacebo —enable-opencl —enable-libcdio —enable-libgme —enable-libmodplug —enable-libopenmpt —enable-libopencore-amrwb —enable-libmp3lame —enable-libshine —enable-libtheora —enable-libtwolame —enable-libvo-amrwbenc —enable-libilbc —enable-libgsm —enable-libopencore-amrnb —enable-libopus —enable-libspeex —enable-libvorbis —enable-ladspa —enable-libbs2b —enable-libflite —enable-libmysofa —enable-librubberband —enable-libsoxr —enable-chromaprint
libavutil 58. 2.100 / 58. 2.100
libavcodec 60. 3.100 / 60. 3.100
libavformat 60. 3.100 / 60. 3.100
libavdevice 60. 1.100 / 60. 1.100
libavfilter 9. 3.100 / 9. 3.100
libswscale 7. 1.100 / 7. 1.100
libswresample 4. 10.100 / 4. 10.100
libpostproc 57. 1.100 / 57. 1.100
Trailing option(s) found in the command : may be ignored.
Input #0, dshow, from 'video=USB Microscope' :
Duration : N/A, start : 5368.514437, bitrate : N/A
Stream #0:0 : Video : rawvideo (YUY2 / 0x32595559), yuyv422(tv, bt470bg/bt709/unknown), 1280x960, 10 fps, 10 tbr, 10000k tbn
Stream mapping :
Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
[swscaler @ 000001442fdcebc0] deprecated pixel format used, make sure you did set range correctly ( that I do not understand )
Last message repeated 3 times
[mjpeg @ 00000144278b0d80] removing common factors from framerate
Output #0, image2, to 'C :\FilmProjList\TEST\TEST%04d.jpg' :
Metadata :
encoder : Lavf60.3.100
Stream #0:0 : Video : mjpeg, yuvj422p(pc, bt470bg/bt709/unknown, progressive), 1280x960, q=2-31, 200 kb/s, 10 fps, 10 tbn
Metadata :
encoder : Lavc60.3.100 mjpeg
Side data :
cpb : bitrate max/min/avg : 0/0/200000 buffer size : 0 vbv_delay : N/A
frame= 0 fps=0.0 q=3.6 size= 0kB time=00:00:00.00 bitrate=N/A speed=N/A
  
frame= 1 fps=0.0 q=3.6 Lsize=N/A time=00:00:00.00 bitrate=N/A speed= 0x
  
video:45kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  


  DefineImage 248 11.05.2023 17:53:23 ( test output from, the C# program)
Das Programm "[11724] Cine2Video.exe" wurde mit Code 0 (0x0) beendet.

  


  


  —

  


  Mit freundlichen Grüßen / Best regards
Ute & Wolfgang Kurz
Domaine : https://uwkurz.de ; Homepage : https://www.uwkurz.de/home
Location : 9° 11' 27,75" East, 48° 43' 32,80" North
E-Mail : wolfgang@uwkurz.de , ute@uwkurz.de
Gesendet über Glasfaser von HOMENET.de

  


  


• Transcode Adobe Media Encoder live stream using FFMPEG in node.js

  23 juin 2014, par user2757842

  I am using Adobe media live encoder to send a stream up to the adobe media server. What I would like to do is take that stream and transcode it to a local file on my machine in another format other that .f4m

  Here is the code I have so far, it is built using FFmpeg within a node.js app :

  var ffmpeg = require('fluent-ffmpeg');
  
  var fs = require('fs');
  
  
  
  //make sure you set the correct path to your video file
  
  var inStream = fs.createReadStream('rtmp://localhost/livepkgr/livestream live=1'); // this is where the streams are stored
  
  var command = new ffmpeg({ source: inStream});
  
  
  
  //Set the path to where FFmpeg is installed
  
  command.setFfmpegPath("C:\\Users\\Jay\\Documents\\FFMPEG\\bin\\ffmpeg.exe");
  
  
  
  command
  
  //set the size
  
  .withSize('100%')
  
  
  
  // set fps
  
  .withFps(24)
  
  
  
  // set output format to force
  
  .toFormat('ismv')
  
  
  
  // setup event handlers
  
  .on('end', function() {
  
      console.log('file has been converted successfully');
  
  })
  
  .on('error', function(err) {
  
      console.log('an error happened: ' + err.message);
  
  })
  
  // save to file <-- the new file I want -->
  
  .saveToFile('rtmp://localhost/livepkgr/livestream1'); //this is where i want to store the newly converted stream

  I have it working with a local file but when I try it with my live stream, I get this error

  events.js:72
  
          throw er; // Unhandled 'error' event
  
                ^
  
  Error: ENOENT, open 'C:\Users\Jay\workspace\FFMPEGtest\rtmp:\localhost\livepkgr\livestream live=1'

  Anyone seen this before ?

• Streaming mp3 using node http to Icecast server gives no output

  6 décembre 2024, par Roboroads

  I'm trying to stream a custom mp3 datastream to Icecast2. Icecast recognises there's a mountpoint, however the streamed data won't play and I have no idea why.

  


  import ffmpeg from 'fluent-ffmpeg';
import { request } from 'node:http';

const req = request(
  {
    host: 'localhost',
    port: 8000,
    path: '/radio',
    method: 'PUT',
    auth: 'source:password',
    headers: {
      'Content-Type': 'audio/mpeg',
      Expect: '100-continue',
      'Ice-Public': 0,
      'Ice-Name': 'Testing Stream!',
      'Ice-Description': 'Testing Stream!',
      'Ice-Genre': 'Various',
      'Icy-MetaData': 1
      //'Icy-MetaInt': metaInt
    }
  },
  (res) => {
    console.log('Server responded with status code:', res.statusCode);
    res.on('data', (chunk) => {
      console.log('Response chunk:', chunk.toString());
    });
  }
);

req.on('error', (err) => {
  console.error('Error streaming to Icecast server:', err);
});

req.on('close', () => {
  console.error('Icecast server closed connection');
  process.exit(1);
});

req.on('continue', () => {
  console.log('Continue event received');
  ffmpeg({ source: 'test.mp3' })
    .native()
    .outputOption(['-map 0:a'])
    .audioBitrate(320)
    .audioCodec('libmp3lame')
    .audioFrequency(44100)
    .audioChannels(2)
    .format('mp3')
    .on('progress', (progress) => {
      console.log('Is open:' + req.socket.writable + ' - ' + progress.timemark);
    })
    .on('start', function (commandLine) {
      console.log('Spawned Ffmpeg with command: ' + commandLine);
    })
    .on('end', () => {
      console.log('Processing finished !');
      req.end();
    })
    .on('error', (err) => {
      console.error('FFmpeg error:', err);
    })
    .pipe(req);
});


  


  Note that when I try to do this with ffmpeg using the icecast protocol, it works without issues : ffmpeg -re -i test.mp3 -b:a 320k -acodec libmp3lame -ar 44100 -ac 2 -map 0:a -f mp3 icecast://source:password@localhost:8000/radio. It looks like something is not right with request.