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• ffmpeg-php loading videos but not generating jpeg (thumbnails)

  16 mars 2021, par Ali Hamdar

  The website is now running on :
finlandbooking.online

  


  Sorry for this noob question first of all.
This is a social media script, when you upload a video, it shows a black thumbnail - you can play the video, but the thumbnail is black. I checked the issue with developers tools, it seems that it's showing error 404 - image not found. ffmpeg, as far as I understood, is supposed to generate an image and display it as a thumbnail. The image is supposed to be located in /uploads/images/ - Kindly check this part of the code and let me know why it's not working :

  


  else if ($action == 'upload_post_video') {
if (empty($cl["is_logged"])) {
    $data['status'] = 400;
    $data['error']  = 'Invalid access token';
}
else {
    $data['err_code'] = "invalid_req_data";
    $data['status']   = 400;
    $post_data        = $me['draft_post'];

    if (not_empty($_FILES['video']) && not_empty($_FILES['video']['tmp_name'])) {
        if (empty($post_data)) {
            $post_id   = cl_create_orphan_post($me['id'], "video");
            $post_data = cl_get_orphan_post($post_id);

            cl_update_user_data($me['id'],array(
                'last_post' => $post_id
            ));
        }

        if (not_empty($post_data) && $post_data["type"] == "video") {
            if (empty($post_data['media'])) {
                $file_info      =  array(
                    'file'      => $_FILES['video']['tmp_name'],
                    'size'      => $_FILES['video']['size'],
                    'name'      => $_FILES['video']['name'],
                    'type'      => $_FILES['video']['type'],
                    'file_type' => 'video',
                    'folder'    => 'videos',
                    'slug'      => 'original',
                    'allowed'   => 'mp4,mov,3gp,webm',
                );

                $file_upload = cl_upload($file_info);
                $upload_fail = false;
                $post_id     = $post_data['id'];

                if (not_empty($file_upload['filename'])) {
                    try {
                        require_once(cl_full_path("core/libs/ffmpeg-php/vendor/autoload.php"));

                        $ffmpeg         =  new FFmpeg(cl_full_path($config['ffmpeg_binary']));
                        $thumb_path     =  cl_gen_path(array(
                            "folder"    => "images",
                            "file_ext"  => "jpeg",
                            "file_type" => "image",
                            "slug"      => "poster",
                        ));

                        $ffmpeg->input($file_upload['filename']);
                        $ffmpeg->set('-ss','3');
                        $ffmpeg->set('-vframes','1');
                        $ffmpeg->set('-f','mjpeg');
                        $ffmpeg->output($thumb_path)->ready();
                    } 

                    catch (Exception $e) {
                        $upload_fail = true;
                    }

                    if (empty($upload_fail)) {
                        $img_id      =  $db->insert(T_PUBMEDIA, array(
                            "pub_id" => $post_id,
                            "type"   => "video",
                            "src"    => $file_upload['filename'],
                            "time"   => time(),
                            "json_data" => json(array(
                                "poster_thumb" => $thumb_path
                            ),true)
                        ));

                        if (is_posnum($img_id)) {
                            $data['status'] =  200;
                            $data['video']  =  array(
                                "source"    => cl_get_media($file_upload['filename']),
                                "poster"    => cl_get_media($thumb_path),
                            );
                        }
                    }
                }
            }
            else {
                $data['err_code'] = "total_limit_exceeded";
                $data['status']   = 400;
            }
        }
        else {
            cl_delete_orphan_posts($me['id']);
            cl_update_user_data($me['id'],array(
                'last_post' => 0
            ));
        }
    }
}


  


  }

  


• Muting ffmpeg warnings when loading video with OpenCV

  26 mai 2017, par cbuchart

  I’m using OpenCV to process a set of MPEG videos. For some of them following warning is displayed when reading a frame or seeking (it is printed by the ffmpeg library).

  [mpeg2video @ 026b0d20] warning : first frame is no keyframe

  The thing is that such messages are printed together other valid output of my application and they are bothering final users. Is there any way to suppress such warning messages programmatically, other than re-coding the videos with an external tool ?

  I’m already muting the standard output and error, as well as using a custom (dummy) OpenCV error handler. Below a MCVE for testing.

  PS : I understand the warning and actually the full project handles those scenarios so videos are correctly read.

  ---

  Example code to reproduce the problem

  #include <iostream>
  
  #include <opencv2></opencv2>core/core.hpp>
  
  #include <opencv2></opencv2>highgui/highgui.hpp>
  
  
  
  int handleError(int status, const char* func_name,
  
                  const char* err_msg, const char* file_name,
  
                  int line, void* userdata)
  
  {
  
    return 0;
  
  }
  
  
  
  int main()
  
  {
  
    std::cout &lt;&lt; "Start!" &lt;&lt; std::endl;
  
  
  
    cv::VideoCapture reader;
  
    if (!reader.open("Sample.mpg")) {
  
      std::cout &lt;&lt; "Failed opening video" &lt;&lt; std::endl;
  
      return 0;
  
    }
  
  
  
    cv::redirectError(handleError);
  
  
  
    std::cout.setstate(std::ios_base::failbit);
  
    std::cout &lt;&lt; "std::cout mute test..." &lt;&lt; std::endl; // OK, muted
  
  
  
    std::cerr.setstate(std::ios_base::failbit);
  
    std::cerr &lt;&lt; "std::cerr mute test..." &lt;&lt; std::endl; // OK, muted
  
  
  
    cv::Mat tmpImage;
  
    try {
  
      tmpImage = tmpImage * tmpImage; // OK, OpenCV error muted
  
    } catch (...) {}
  
  
  
    // Here the warning is printed
  
    reader.read(tmpImage);
  
  
  
    std::cout.clear();
  
    std::cerr.clear();
  
    std::cout &lt;&lt; "Finished!" &lt;&lt; std::endl;
  
  
  
    return 0;
  
  }
  
  </iostream>

  The Sample.mpg video can be downloaded from the Internet Archive : https://archive.org/download/ligouHDR-HC1_sample1/Sample.mpg

  This is the current output of the program :

  

  ---

  I’m using VS 2010 and OpenCV 2.4.10. Following DLLs are the only ones with the executable (no other OpenCV-related DLL is reachable in the PATH).

  • opencv_core2410.dll
  • opencv_ffmpeg2410.dll
  • opencv_highgui2410.dll

• VideoCapture always returns False in Python OPENCV [Linux]

  7 avril 2017, par Daniyal Shahrokhian

  Every time that I use VideoCapture trying to access the frames from a video file, the return value (ret) is false. See the sample code below :

  cap = cv2.VideoCapture('asd.mkv')
  
      vid = []
  
      while True:
  
          ret, img = cap.read()
  
          if not ret: # Always happens
  
              break
  
          vid.append(cv2.resize(img, (171, 128)))

  I have already tried absolutely everything I could find today by googling, including the OpenCV guide and this long issue on Github. Also, I read some solutions involving moving ffmpeg dll files, but that only was in the case of Windows.

  Any ideas ? Because I defenitely ran out of them.