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• Error -138 returns "Error number -138 occurred"

  29 avril 2016, par bot1131357

  I am trying to create a program that listens for a period of time, and then times out so that it can return to work on other tasks and retry again later. Here is the code I am testing with :

  AVFormatContext *pFormatCtx = NULL;
  
  AVCodecContext *codecCtx = NULL;
  
  AVCodec *codec;
  
  int ret = 0;
  
  
  
  // Register all formats and codecs
  
  av_register_all();
  
  avformat_network_init(); // for network streaming
  
  
  
  AVDictionary *d = NULL;           // "create" an empty dictionary
  
  av_dict_set(&d, "timeout", "5", 0); // add an entry
  
  av_dict_set(&d, "rtsp_flags", "listen", 0); // add an entry
  
  
  
  char filename[100];
  
  sprintf_s(filename, sizeof(filename), "%s", "rtsp://127.0.0.1:8554/demo");
  
  
  
  
  
  //:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
  
  printf_s("Open video file.\n");
  
  // Open video file
  
  ret = avformat_open_input(&pFormatCtx, filename, NULL, &d);   // Returns -138 here 
  
  if (ret <0)
  
  {
  
      printf_s("Failed: cannot open input.\n");
  
      av_strerror(ret, errbuf, ERRBUFFLEN);
  
      fprintf(stderr, "avformat_open_input() fail: %s\n", errbuf);
  
      continue;
  
      //return -1; // Couldn't find stream information
  
  }

  In the listening mode, avformat_open_input() returns -138. Using av_strerror() gives the following explanation : "Error number -138 occurred"

  Is this an Easter egg ? What does -138 stand for ?

• FFMPEG : sws_scale returns error : Slice parameters 0, 2160 are invalid

  21 janvier 2020, par Matthew Czarnek

  I’m trying to follow a tutorial to display ffmpeg AVFrame output in SDL. The tutorial(and all examples I’m seeing online) are still using ’sws_getContext’, which has been deprecated and removed from the newest version of ffmpeg. Trying to change current pixel format from whatever it currently is to PIX_FMT_YUV420P, so I can display it. I believe I need the sws_scale function to accomplish this.

  However, sws_scale is the function that causes a command line error of :
  Slice parameters 0, 2160 are invalid

  Here is all my code associate with swsContext :

  struct SwsContext* av_sws_ctx = NULL;
  
  av_sws_ctx = sws_alloc_context();
  
  
  
  sws_init_context(av_sws_ctx, NULL, NULL);
  
  
  
  sws_scale(av_sws_ctx, (uint8_t const* const*)av_frame->data,
  
                          av_frame->linesize, 0, av_codec_context->height,
  
                          av_frame->data, av_frame->linesize);

  Further complicating the matter, SwsContext is only defined internal to ffmpeg, externally I can’t set/get any variables or even view them in the debugger.

  int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[] )

  The vales of other parameters, other than av_sws_ctx :

  srcSlice: av_frame->data = 
  
       8 arrays, first is filled with "\x10\x10\x10\x10\x10..."
  
       second and third are "€€€€€€€€€€€€€€€€€..."
  
       rest are NULL
  
  linesize(av_frame->linesize) is an array:
  
      3840,1920,1920,0,0,0,0,0
  
  srcSliceY:0
  
  srcSliceH:2160
  
  dest: same as second parameter (av_frame->data)
  
  dstStride: av_frame->linesize again

  If I drill into sws_scale source code, I find that this error is thrown by this chunk of code :

  if ((srcSliceY & (macro_height-1)) ||
  
          ((srcSliceH& (macro_height-1)) && srcSliceY + srcSliceH != c->srcH) ||
  
          srcSliceY + srcSliceH > c->srcH) {
  
          av_log(c, AV_LOG_ERROR, "Slice parameters %d, %d are invalid\n", srcSliceY, srcSliceH);
  
          return AVERROR(EINVAL);
  
      }

  I assume that the issue therefore is that the height of my video is bigger than sws_context(4k video). But can’t figure out how to tell sws_context what it’s height should be using sws_alloc_context or sws_init_context or any other function.

  See something I’m missing ? Thank you.

• PHP Create video thumbnail with FFMPEG - returns error code 1

  27 février 2013, par Light

  I am trying to create a video thumbnail with FFMPEG using the following script.
  However I am getting return value of 1. What does it mean ? What is error code 1 ? I have Googled it and didn't find and answer. Thanks.
  Here is the code :

  <?php
  
  
  
          //thumb path should be added in the below code
  
          //test for thumb
  
          $dir_img='uploads/';
  
          $mediapath='thumb.jpg';
  
          $file_thumb=create_movie_thumb('test.mp4',$mediapath,$mediaid);
  
  
  
          $name_file=explode(".",$mediapath);
  
          $imgname="thumb_".$name_file[0].".jpg";     
  
  
  
          /*
  
            Function to create video thumbnail using ffmpeg
  
          */
  
          function create_movie_thumb($src_file,$mediapath,$mediaid)
  
          {
  
  
  
              global $CONFIG, $ERROR;
  
  
  
              $CONFIG['ffmpeg_path'] = '/usr/bin/'; // Change the path according to your server.
  
              $dir_img='uploads/';
  
              $CONFIG['fullpath'] = $dir_img."thumbs/";
  
  
  
              $src_file = $src_file;
  
              $name_file=explode(".",$mediapath);
  
              $imgname="thumb_".$name_file[0].".jpg";
  
              $dest_file = $CONFIG['fullpath'].$imgname;
  
  
  
              if (preg_match("#[A-Z]:|\\\\#Ai", __FILE__)) {
  
                  // get the basedir, remove '/include'
  
                  $cur_dir = substr(dirname(__FILE__), 0, -8);
  
                  $src_file = '"' . $cur_dir . '\\' . strtr($src_file, '/', '\\') . '"';
  
                  $ff_dest_file = '"' . $cur_dir . '\\' . strtr($dest_file, '/', '\\') . '"';
  
              } else {
  
                  $src_file = escapeshellarg($src_file);
  
                  $ff_dest_file = escapeshellarg($dest_file);
  
              }
  
  
  
              $output = array();
  
  
  
              if (eregi("win",$_ENV['OS'])) {
  
                  // Command to create video thumb
  
                  $cmd = "\"".str_replace("\\","/", $CONFIG['ffmpeg_path'])."ffmpeg\" -i ".str_replace("\\","/" ,$src_file )." -an -ss 00:00:05 -r 1 -vframes 1 -y ".str_replace("\\","/" ,$ff_dest_file);
  
                  exec ("\"$cmd\"", $output, $retval);
  
                  echo "exec1";
  
  
  
              } else {
  
                  // Command to create video thumb
  
                  $cmd = "{$CONFIG['ffmpeg_path']}ffmpeg -i $src_file -an -ss 00:00:05 -r 1 -vframes 1 -y $ff_dest_file";
  
                  exec ($cmd, $output, $retval);
  
                  echo "exec2";
  
              }
  
  
  
  
  
              if ($retval) {
  
                  $ERROR = "Error executing FFmpeg - Return value: $retval";
  
                  if ($CONFIG['debug_mode']) {
  
                      // Re-execute the command with the backtick operator in order to get all outputs
  
                      // will not work if safe mode is enabled
  
                      $output = `$cmd 2>&1`;
  
                      $ERROR .= "<br /><br /><div align="\&quot;left\&quot;">Cmd line : <br /><span style="&quot;font-size:120%&quot;">" . nl2br(htmlspecialchars($cmd)) . "</span></div>";
  
                      $ERROR .= "<br /><br /><div align="\&quot;left\&quot;">The ffmpeg program said:<br /><span style="&quot;font-size:120%&quot;">";
  
                      $ERROR .= nl2br(htmlspecialchars($output));
  
                      $ERROR .= "</span></div>";
  
                  }
  
                  echo $ERROR;
  
                  @unlink($dest_file);
  
                  return false;
  
              }
  
  
  
              $return = $dest_file;
  
              //@chmod($return, octdec($CONFIG[&#39;default_file_mode&#39;])); //silence the output in case chmod is disabled
  
              return $return;
  
          } 
  
  ?>