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• how to stop the FFmpeg process programmatically without using Ctrl + C ?

  30 septembre 2024, par bee

  const shell = require("shelljs");

const processShell = shell.exec(
  `ffmpeg -i "https://pull-hls-f16-va01.tiktokcdn.com/game/stream-2998228870023348312_or4/index.m3u8?expire=1728629296&session_id=000-2024092706481532076B1319E1100113F8&sign=1016b521d08053bc0ae8eddb0881b029" -movflags use_metadata_tags -map_metadata 0 -metadata title="Chill chill kiß║┐m k├¿o Warthunder" -metadata artist="bacgaucam" -metadata year="2024" -c copy "downloads/bacgaucam-927202491939.mp4" -n -stats -hide_banner -loglevel error`,
  { async: true }
);

setTimeout(() => {
  // processShell.kill();
  process.exit();
}, 20000);


  


  my video only works when I use Ctrl+C to stop it. I’ve tried using process.exit(), .kill(pid, "SIGINT"), and the .kill() method from the shell.exec() ffmpeg() of fluent-ffmpeg or spawn() of child_process reference, but none of them work

  


  If you want to test it directly, please message me to get a new live url in case it expires (https://t.me/ppnam15) or clone this :
https://github.com/loo-kuhs/tiktok-live-downloader

  


  can anyone help ? Thanks !

  


• Trying to capture display output for real-time analysis with OpenCV ; I need help with interfacing with the OS for input

  26 juillet 2024, par mirari

  I want to apply operations from the OpenCV computer vision library, in real time, to video captured from my computer display.
The idea in this particular case is to detect interesting features during gameplay in a popular game and provide the user with an enhanced experience ; but I could think of several other scenarios where one would want to have live access to this data as well. 
At any rate, for the development phase it might be acceptable using canned video, but for the final application performance and responsiveness are obviously critical.

  



  I am trying to do this on Ubuntu 10.10 as of now, and would prefer to use a UNIX-like system, but any options are of interest.
My C skills are very limited, so whenever talking to OpenCV through Python is possible, I try to use that instead.
Please note that I am trying to capture NOT from a camera device, but from a live stream of display output ; and I'm at a loss as to how to take the input. As far as I can tell, CaptureFromCAM works only for camera devices, and it seems to me that the requirement for real-time performance in the end result makes storage in file and reading back through CaptureFromFile a bad option.

  



  The most promising route I have found so far seems to be using ffmpeg with the x11grab option to capture from an X11 display ;
(e.g. the command
ffmpeg -f x11grab -sameq -r 25 -s wxga -i :0.0 out.mpg
captures 1366x768 of display 0 to 'out.mpg').
I imagine it should be possible to treat the output stream from ffmpeg as a file to be read by OpenCV (presumably by using the CaptureFromFile function) maybe by using pipes ; but this is all on a much higher level than I have ever dealt with before and I could really use some directions. 
Do you think this approach is feasible ? And more importantly can you think of a better one ? How would you do it ?

  


• Unity : Converting Texture2D to YUV420P and sending with UDP using FFmpeg

  22 juin 2018, par potu1304

  In my Unity game each frame is rendered into a texture and then put together into a video using FFmpeg. Now my questions is if I am doing this right because avcodec_send_frame throws every time an exception.
  I am pretty sure that I am doing something wrong or in the wrong order or simply missing something.

  Here is the code for capturing the texture :

  void Update() {
  
          //StartCoroutine(CaptureFrame());
  
  
  
          if (rt == null)
  
          {
  
              rect = new Rect(0, 0, captureWidth, captureHeight);
  
              rt = new RenderTexture(captureWidth, captureHeight, 24);
  
              frame = new Texture2D(captureWidth, captureHeight, TextureFormat.RGB24, false);
  
          }
  
  
  
          Camera camera = this.GetComponent<camera>(); // NOTE: added because there was no reference to camera in original script; must add this script to Camera
  
          camera.targetTexture = rt;
  
          camera.Render();
  
  
  
          RenderTexture.active = rt;
  
          frame.ReadPixels(rect, 0, 0);
  
          frame.Apply();
  
  
  
          camera.targetTexture = null;
  
          RenderTexture.active = null;
  
  
  
          byte[] fileData = null;
  
          fileData = frame.GetRawTextureData();
  
          encoding(fileData, fileData.Length);
  
  
  
      }
  
  </camera>

  And here is the code for encoding and sending the byte data :

  private unsafe void encoding(byte[] bytes, int size)
  
      {
  
          Debug.Log("Encoding...");
  
          AVCodec* codec;
  
          codec = ffmpeg.avcodec_find_encoder(AVCodecID.AV_CODEC_ID_H264);
  
          int ret, got_output = 0;
  
  
  
          AVCodecContext* codecContext = null;
  
          codecContext = ffmpeg.avcodec_alloc_context3(codec);
  
          codecContext->bit_rate = 400000;
  
          codecContext->width = captureWidth;
  
          codecContext->height = captureHeight;
  
          //codecContext->time_base.den = 25;
  
          //codecContext->time_base.num = 1;
  
  
  
          AVRational timeBase = new AVRational();
  
          timeBase.num = 1;
  
          timeBase.den = 25;
  
          codecContext->time_base = timeBase;
  
          //AVStream* videoAVStream = null;
  
          //videoAVStream->time_base = timeBase;
  
  
  
  
  
  
  
          AVRational frameRate = new AVRational();
  
          frameRate.num = 25;
  
          frameRate.den = 1;
  
          codecContext->framerate = frameRate;
  
  
  
          codecContext->gop_size = 10;
  
          codecContext->max_b_frames = 1;
  
          codecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P;
  
  
  
          AVFrame* inputFrame;
  
          inputFrame = ffmpeg.av_frame_alloc();
  
          inputFrame->format = (int)codecContext->pix_fmt;
  
          inputFrame->width = captureWidth;
  
          inputFrame->height = captureHeight;
  
          inputFrame->linesize[0] = inputFrame->width;
  
  
  
          AVPixelFormat dst_pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P, src_pix_fmt = AVPixelFormat.AV_PIX_FMT_RGBA;
  
          int src_w = 1920, src_h = 1080, dst_w = 1920, dst_h = 1080;
  
          SwsContext* sws_ctx;
  
  
  
          GCHandle pinned = GCHandle.Alloc(bytes, GCHandleType.Pinned);
  
          IntPtr address = pinned.AddrOfPinnedObject();
  
  
  
          sbyte** inputData = (sbyte**)address;
  
          sws_ctx = ffmpeg.sws_getContext(src_w, src_h, src_pix_fmt,
  
                               dst_w, dst_h, dst_pix_fmt,
  
                               0, null, null, null);
  
  
  
          fixed (int* lineSize = new int[1])
  
          {
  
              lineSize[0] = 4 * captureHeight;
  
              // Convert RGBA to YUV420P
  
              ffmpeg.sws_scale(sws_ctx, inputData, lineSize, 0, codecContext->width, inputFrame->extended_data, inputFrame->linesize);
  
          }
  
  
  
          inputFrame->pts = counter++;
  
  
  
          if (ffmpeg.avcodec_send_frame(codecContext, inputFrame) < 0)
  
              throw new ApplicationException("Error sending a frame for encoding!");
  
  
  
          AVPacket pkt;
  
          pkt = new AVPacket();
  
          //pkt.data = inData;
  
          AVPacket* packet = &pkt;
  
          ffmpeg.av_init_packet(packet);
  
  
  
          Debug.Log("pkt.size " + pkt.size);
  
          pinned.Free();
  
          AVDictionary* options = null;
  
          ffmpeg.av_dict_set(&options, "pkt_size", "1300", 0);
  
          ffmpeg.av_dict_set(&options, "buffer_size", "65535", 0);
  
          AVIOContext* server = null;
  
          ffmpeg.avio_open2(&server, "udp://192.168.0.1:1111", ffmpeg.AVIO_FLAG_WRITE, null, &options);
  
          Debug.Log("encoded");
  
          ret = ffmpeg.avcodec_encode_video2(codecContext, &pkt, inputFrame, &got_output);
  
          ffmpeg.avio_write(server, pkt.data, pkt.size);
  
          ffmpeg.av_free_packet(&pkt);
  
          pkt.data = null;
  
          pkt.size = 0;
  
      }

  And every time I start the game

    if (ffmpeg.avcodec_send_frame(codecContext, inputFrame) < 0)
  
              throw new ApplicationException("Error sending a frame for encoding!");

  throws the exception.
  Any help in fixing the issue would be greatly appreciated :)