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• While ffmpeg convers via php website doesnt work

  29 octobre 2013, par Xenos Trojanowicz

  So im using

                  if ($success_msg) 
  
              {
  
                  $tmp_parts = explode('.', $file['name']);
  
                  $ext = array_pop($tmp_parts);
  
                  $ext = strtolower($ext);
  
                  if($ext == "avi" && $convert_avi == true)
  
                      {
  
                          $convert_source = _VIDEOS_DIR_PATH.$new_name;
  
                          $conv_name = substr(md5($file['name'].rand(1,888)), 2, 10).".mp4";
  
                          $converted_file  = _VIDEOS_DIR_PATH.$conv_name;
  
                          $ffmpeg_command = 'ffmpeg -i '.$convert_source.'-acodec libfaac -vcodec libx264 -s 1280x720 -ar 44100 -async 44100 -r 29.970 -ac 2 -qscale 5 '.$converted_file;
  
                          echo exec($ffmpeg_command);
  
                          $sql = "UPDATE pm_temp SET url = '".$conv_name."' WHERE url = '".$new_name."' LIMIT 1";
  
                          $result = @mysql_query($sql);
  
                          unlink($convert_source);    
  
                      }
  
                  echo $success_msg;
  
              }

  This code to convert videos from avi to mp4 but i have another big issue when i upload big file let say 170 mb it converts about 25 minutes or so and while it converts website doesnt work for me.

  NOW I KNOW WHY WEBSITE DOESNT WORK :

  • its only for me becose system doesnt open extra slot to enter to website while it converts
  • i know how to solve this problem with cronjob but im afraid that if something goes wrong it will be biggest fail i ever had

  so im hopping that u guys will suggest something smart and easy to deal with this issue

• Is it safe to set AVPacket::duration to one ?

  9 septembre 2021, par Vivekanand V

  I am new to the world of programming of multimedia applications. I just managed to get a hold of FFMPEG's libraries to perform video encoding and decoding in C/C++ and I feel that I have a lack of understanding in many aspects of the whole process.

  


  My application converts an RGB24 array referenced by unsigned char* to a AVFrame, and encodes it to a video file.

  


  During initialization, I set the time base in codec context to 1/fps, where fps is the frame rate.

  


  AVStream::time_base is also set to the same value.

  


  Is there is a mathematical relationship between these time bases to AV_TIME_BASE constant ?

  


  How should AVFrame::pts be set. Here I am just incrementing by one for every encoding operation.

  


  How should AVPacket::duration be set, before calling av_interleaved_write_frame ?

  


  What is the significance of AVPacket::pts and AVPacket::dts ?

  


• Using FFmpeg native libraries with Android-NDK

  24 octobre 2013, par ssrp

  I could write a simple "Hello World" app and got it to compile and run ok, I know how to setup basic structure of an Android project to use native libraries. Could any one tell me how to use FFmpeg libraries to decode a video ;

  • How to write a .cpp file to decode a video file using the libraries(Open, Decode, Save)
  • How to setup source files(in my case .cpp files) with Android.mk file

  Please could anyone help.