Recherche avancée

Sur d’autres sites (10094)

• PHP Ignoring my max_execution_time

  13 décembre 2016, par Muhammad Resna Rizki Pratama

  I have some task in my script that is about converting video with ffmpeg . I do this with codeigniter 2.0.3 and locate the script at libraries and use shell_exec() to run ffmpeg.

  There are 3 tasks in my php script.

  1. Upload File
  2. Convert video to .flv
  3. Generate thumb
  4. Save to db.

  When I upload file, my php script start to convert my uploaded video. But when converting is end about over 5 minutes. Its not continue to generate thumb. And Its say

  PHP Fatal error : Maximum execution time of 300 seconds exceeded in C :\AppServ\www\mis\application\libraries\my_video_utility.php on line 102, referer : http://localhost/mis/test/

  I have set my max_execution time, max_input_time, etc to 3600 in php.ini also add set_time_limit() and set_ini() in my php script. But, its still get error.

  But, when I uploaded short video, its done.

• How to calculate ffmpeg output file size ?

  25 septembre 2011, par poundifdef

  I am using ffmpeg to convert home videos to DVD format and want to calculate the output file size before doing the conversion.

  My input file has a bit rate of 7700 kbps and is 114 seconds long. The audio bitrate is 256 kbit (per second ?) The input file is 77MB. To get this information I ran :

  mplayer -vo null -ao null -frames 0 -identify input.MOD

  So in theory, the input file should have (roughly) a file size of :

  ((7700 / 8) * 114) / 1024

  That is, (7700 / 8) is kilobytes/second, multiplied by 114 seconds, and then converted to megabytes. This gives me 107MB, which is way beyond my 77. Thus I am skeptical of his formula.

  That said, after converting the video :

  ffmpeg -i input.MOD -y -target ntsc-dvd -sameq -aspect 4:3 output.mpg

  The numbers seem to make more sense. Bitrate is 9000 kbps, and applying the above formula, I get 125MB, and my actual output file size is 126MB.

  So, two questions :

  1. How do I factor the audio bitrate into this calculation ? Is it additive (video file size + audio file size) ?

  2. Do DVDs always have a 9000 kilobit/second rate ? Is that the definition of a DVD ? Or might that change depending on video quality of my input video ? What does "-target ntsc-dvd" guarantee about my video ?

  3. Why does my input file not "match" the calculation, but the output file does ? Is there some other variable I'm not accounting for ?

  What is the correct way to calculate filesize ?

• Tell a java servlet when to return from an external command line call

  20 septembre 2011, par Morgan

  I have a java servlet api, that when requested, starts a live conversion of a video file using ffmpeg and pipes it to mediastreamsegmenter to segment it for http live streaming. What I want is for the java servlet to return the url of the index file as soon as it has been generated (after the 4th transport stream file is written) so the user can start watching the video without waiting for it to fully finish converting.

  How I was thinking of achieving this was to pass a command into the -file-complete-command argument of mediastreamsegmenter, and have it call some sort of a command that could tell the java servlet to return its response if the last file completed was the index file.

  Another idea I had was to just segment the first 30 seconds or so of the video, and then return the response, and add the remainder of the video into some sort of a background task in the servlet. I'm not sure how this would be done though. Could I create a separate thread to do this conversion that will continue to run after the servlet returns ? I'm sure there must be a better way of doing this. Any thoughts would be appreciated.