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• OpenCV [[mjpeg @ 0000000000428480] overread 8] during reading a frame from camera

  8 octobre 2015, par wojcienty

  I have a very annoying OpenCV error, that i can’t understand, and handle with.
  I write an application which gets mjpg’s stream from ip camera, and process it, but when i try to load image from stream, sometimes i have

  [mjpeg @ 0000000000428480] overread 8

  error, and i don’t know why.
  Even if i try to skip this issue, and try to load next frame from the stream, the application stucks on

  frameStatus = cameraHandler->read(mat);

  This is code for connection establishing :

  void ImageProcessor::connectWithCamera(VideoCapture * cameraHandler) {
  
      if (cameraHandler != nullptr) {
  
          Logger::log("Closing existing camera stream.");
  
          cameraHandler->release();
  
          delete cameraHandler;
  
      }
  
      Logger::log("Camera configuration and connection establishing.");
  
      cameraHandler = new VideoCapture();
  
      cameraHandler->set(CV_CAP_PROP_FRAME_WIDTH, config.RESOLUTION_WIDTH);
  
      cameraHandler->set(CV_CAP_PROP_FRAME_HEIGHT, config.RESOLUTION_HEIGHT);
  
      cameraHandler->set(CV_CAP_PROP_FPS, config.CAMERA_FPS);
  
      cameraHandler->set(CV_CAP_PROP_FOURCC, CV_FOURCC('M', 'J', 'P', 'G'));
  
      while (!cameraHandler->open(config.LINK)) {
  
          Logger::log("Cannot connect to camera! Trying again.");
  
      }
  
  }

  And this is code for capturing images :

  void ImageProcessor::start() {
  
  
  
      VideoCapture * cameraHandler = new VideoCapture();
  
      this->connectWithCamera(cameraHandler);
  
      this->connectWithServer(this->serverConnection);
  
  
  
      Logger::log("Id sending.");
  
      serverConnection->send(config.TOKEN + "\n");
  
      Logger::log("Computations starting.");
  
  
  
      Mat mat;
  
      Result * result = nullptr;
  
      int delta = 1000 / cameraHandler->get(CV_CAP_PROP_FPS);
  
      char frameErrorCounter = 0;
  
      bool frameStatus;
  
  
  
      while (true) {
  
          frameStatus = false;
  
          cv::waitKey(delta);
  
  
  
          try {
  
              frameStatus = cameraHandler->read(mat);
  
          } catch (std::exception& e) {
  
              std::string message = e.what();
  
              Logger::log("Critical camera error! : " + message);
  
          }
  
  
  
          if (!frameStatus) {
  
              Logger::log("Cannot read a frame from source. ");
  
              ++frameErrorCounter;
  
              if (!cameraHandler->isOpened() || frameErrorCounter >= this->GET_FRAME_ERROR_COUNTER) {
  
                  Logger::log("Probably camera is disconnected. Trying to establish connection again.");
  
                  frameErrorCounter = 0;
  
                  this->connectWithCamera(cameraHandler);
  
                  Logger::log("Computations starting.");
  
              }
  
              continue;
  
          }
  
  
  
          result = processImage(mat);
  
  
  
          std::string stringResult;
  
          if (result == nullptr) {
  
              stringResult = this->NO_RESULT;
  
              delete result;
  
              result = nullptr;
  
          } else {
  
              stringResult = result->toJson();
  
          }
  
  
  
          if (!serverConnection->send(stringResult)) {
  
              Logger::log("Server connection lost, trying to establish it again.");
  
              serverConnection->close();
  
              while (!serverConnection->isOpen()) {
  
                  this->connectWithServer(serverConnection);
  
              }
  
          }
  
  
  
          mat.release();
  
      }
  
  
  
  }

  Thanks in advance !

• Encoding for HTTP Live Streaming with Xuggle

  26 mai 2012, par Luuk D. Jansen

  I have created a server system based on Xuggle to encode an incoming file to H264 and segment it. However, when playing the video back in Quicktime it almost works (with a small hiccup in the audio sometimes) but when changing fro one quality stream to another the image gets lost.

  So I ran the 'mediastreamvalidator'and got the following error :

  ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
  ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

  So I used FFMPEG to get some info on the codex :
  The result of my Xuggler encoding :

  Input #0, mpegts, from 'segment_0.ts':
  
    Duration: 00:00:09.40, start: 0.000000, bitrate: 3618 kb/s
  
    Program 1 
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0.0[0x100]: Video: mpeg2video (Main), yuv420p, 960x540 [PAR 1:1 DAR 16:9], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0.1[0x101]: Audio: mp2, 48000 Hz, stereo, s16, 128 kb/s

  The result of a file created by Compressor :

  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 25.00 (25/1)
  
  Input #0, mpegts, from 'fileSequence1.ts':
  
    Duration: 00:00:09.97, start: 19.984578, bitrate: 5308 kb/s
  
    Program 1 
  
      Stream #0.0[0x101]: Video: h264 (Main), yuv420p, 960x540, 25 tbr, 90k tbn, 180k tbc
  
      Stream #0.1[0x102]: Audio: aac, 22050 Hz, stereo, s16, 32 kb/s

  The main difference seems to me that for the Xuggler encoded file it says Video : mpeg2video instead of h264. However, while encoding I did specifically set the Coder to ICodec.ID.CODEC_ID_H264.

  How can I force it to use h264. The same with audio. I specified AAC and get MP2.

  I subsequent used FFMPEG directly and that results in :

  Input #0, mpegts, from 'encoded.ts':
  
    Duration: 00:00:24.16, start: 1.400000, bitrate: 360 kb/s
  
    Program 1 
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0.0[0x100]: Video: h264 (Main), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0.1[0x101](eng): Audio: aac, 48000 Hz, stereo, s16, 57 kb/s

  That looks better. I could use FFMPEG directly, but by using Xuggler I can segment the file while easier keep track of progress of the process.

• Fluent-FFMPEG : Failed to configure output pad on Parsed_concat_0 [duplicate]

  16 septembre 2020, par Suo

  Merging videos with Fluent-FFMPEG

  


  Environment

  


  

  • NodeJS v10

  


  • Fluent-FFMPEG

  


  


  Description

  


  I'm currently trying to make a webservice merging videos with Fluent-FFMPEG.

  


  It's quite simple :

  


  INPUT

  


  You have N Videos with the same resolution, format, codec (both audio and video), framerate and bitrate (also for audio and video).

  


  prepareAndExecuteMergeProcess(entity, files) {
    let mergeProcess = ffmpeg()
    for (let file in files) {
        let video = files[file];
        mergeProcess.addInput(this.getInputTempDir(video)); //InputTempDir is the temporary folder where the video is stored
    }
    mergeProcess.mergeToFile(this.getOutputTempDir(entity), this.getProcessTempDir(entity));

    mergeProcess.on('error', (err, stdout, stderr) => {
        console.error('An error occurred: ' + err.message);
        console.log("ffmpeg stdout:\n" + stdout);
        console.log("ffmpeg stderr:\n" + stderr);
    })
    mergeProcess.on('progress', (progress) => {
        console.log("Merging... : " + progress.percent + "%");
    });
    mergeProcess.on('end', () => {
        console.info('Merging finished !');
    })
}


  


  VIDEO FORMAT

  


  All the videos that are used by this service were converted by this process beforehand :

  


   let process = ffmpeg({source: this.getInputTempDir(entity)});
 process.output(this.getOutputTempDir(entity))
        .size(entity.profile.resolution)
        .format(entity.profile.format)
        .audioBitrate(128)
        .aspect('16:9')
        .autopad()
        .run()



  


  OUTPUT

  


  This is what I get :

  


  [Parsed_concat_0 @ 000001c190524300] Input link in1:v0 parameters (size 720x480, SAR 0:1) do not match the corresponding output link in0:v0 parameters (720x480, SAR 404:405)
[Parsed_concat_0 @ 000001c190524300] Failed to configure output pad on Parsed_concat_0
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #1:0
[aac @ 000001c19043b740] Qavg: 9636.813
[aac @ 000001c19043b740] 2 frames left in the queue on closing


  


  Am I missing something ? I'm quite lost on this one and the documentation isn't really clear about those cases....

  


  Thank you in advance