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• FFmpeg : Image scrolling, with green background ?

  23 avril 2017, par John Reese

  Good morning, I hope you are well.

  Please, I need help with the following...

  I’m moving an image vertically, and I see that the background of the video is green.
  How can I change this background color ?

  Example code :

  ffmpeg -loop 1 -t 24 -i "image.jpg" -filter_complex "nullsrc=size=640x360[background] ;[background][0:v]overlay=shortest=1:y=’min(0,-(t)*26)’" -qscale 1 -y out.mpg

  Video Result : https://youtu.be/98rKLVO56wA

  I hope I can help,

  Thank you very much,
  Greetings,
  Hugo

• PHP readfile on a file which is increasing in size

  13 février 2013, par Sathiya Sundaram

  Is it possible to use PHP readfile function on a remote file whose size is unknown and is increasing in size ? Here is the scenario :

  I'm developing a script which downloads a video from a third party website and simultaneously trans-codes the video into MP3 format. This MP3 is then transferred to the user via readfile.

  The query used for the above process is like this :

  wget -q -O- "VideoURLHere" | ffmpeg -i - "Output.mp3" > /dev/null 2>&1 &

  So the file is fetched and encoded at the same time.
  Now when the above process is in progress I begin sending the output mp3 to the user via readfile. The problem is that the encoding process takes some time and therefore depending on the users download speed readfile reaches an assumed EoF before the whole file is encoded, resulting in the user receiving partial content/incomplete files.

  My first attempt to fix this was to apply a speed limit on the users download, but this is not foolproof as the encoding time and speed vary with load and this still led to partial downloads.

  So is there a way to implement this system in such a way that I can serve the downloads simultaneously along with the encoding and also guarantee sending the complete file to the end user ?

  Any help is appreciated.

  EDIT :
  In response to Peter, I'm actually using fread(read readfile_chunked) :

   <?php
  
   function readfile_chunked($filename,$retbytes=true) {
  
              $chunksize = 1*(1024*1024); // how many bytes per chunk
  
              $totChunk = 0;
  
              $buffer = '';
  
              $cnt =0;
  
              $handle = fopen($filename, 'rb');
  
              if ($handle === false) {
  
                  return false;
  
              }
  
              while (!feof($handle)) {
  
                  //usleep(120000); //Used to impose an artificial speed limit
  
                  $buffer = fread($handle, $chunksize);
  
                  echo $buffer;
  
                  ob_flush();
  
                  flush();
  
                  if ($retbytes) {
  
                      $cnt += strlen($buffer);
  
                  }
  
              }
  
                  $status = fclose($handle);
  
              if ($retbytes && $status) {
  
                  return $cnt;        // return num. bytes delivered like readfile() does.
  
              }
  
              return $status;
  
          }
  
          readfile_chunked($linkToMp3);
  
      ?>

  This still does not guarantee complete downloads as depending on the users download speed and the encoding speed, the EOF() may be reached prematurely.

  Also in response to theJeztah's comment, I'm trying to achieve this without having to make the user wait..so that's not an option.

• ffmpeg hardware accelaration using intel GPU gives green lines flasing

  19 juillet 2022, par stb cdot

  I'm trying to transcode and stream a video using ffmpeg hardware accelartion which utilizes intel GPU. But the output is resulting in green lines flashing.

  


  Command I used :

  


  ffmpeg -loglevel quiet -stats -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -itsoffset -0 -re -i "udp ://230.0.0.2:30502 ?fifo_size=102000000" -map 0:i:0x13ed -map 0:i:0x17d5 -compression_level 4 -c:v h264_vaapi -b:v 2M -maxrate 2M -c:a aac -ac 2 -b:a 128k -f flv rtmp ://192.168.47.191/TvApp/ch101 -async 1 -vsync 1

  


  Processor : i7-7700