Recherche avancée

Sur d’autres sites (11854)

• Multi core theora encoding

  26 octobre 2012, par Jamie Taylor

  We convert uploaded video to MP4 and OGV, but while trying to speed up the process we've hit a wall. We found the bottleneck is the OGV encoding, While it might take 5 minutes to convert a 350mb AVI to MP4, it takes roughly 25-30 minutes to convert the same file to OGV.

  avconv supports multithreading/multiple cores but it seems that libtheora doesn't, does anyone have any way of encoding over multiple cores ? I found an old mail group which discussed a patch but I can't find much else about it, or if it even still works 5 years on.

  So. Is multi-core theora processing possible and what should I use to do it ?

  For Reference :

  avconv -y -i big_buck_bunny_720p_surround.avi -vcodec libtheora -qscale 10 -bufsize 20M -same_quant -acodec libvorbis -ac 2 -ar 44100 -ab 128k buck.ogv

• Best Web Video Encoding Practices for IOS (FFMpeg)

  21 juin 2012, par MagicMushroom

  I am working on an online video repository system for a client, written mostly in PHP. At the moment I am building a mobile version of our desktop website. Our desktop site allows users to watch videos in the browser, much like YouTube.

  My client uploads videos through the manager interface I have created, and my application uses FFmpeg on the server to transcode his videos into several resolutions and bitrates. I am no expert on FFmpeg, and while I do not know the ins and outs of each individual setting, I do understand how it works as a whole. Right now, we are using the mp4 container format with the h.264 codec to encode our videos. Our command looks like :

  ffmpeg -y -i "INPUT FILE.mov" -f mp4 -s 640x480 -vcodec libx264 -preset fast -maxrate 1500 -bitrate 1000 -bufsize 4096 -acodec libfaac -ab 192 -ac 2 "OUTPUT_FILE.mp4" >> "FILE.log" 2>&1 &

  I'm hoping to gain information about best practices with encoding video for web streaming on IOS and other mobile devices using FFmpeg. What resolutions and settings make for good mobile streaming video ? How can I ensure maximum compatibility across the sea of Android devices ?

• sting up ffmpeg to work in XAMPP

  1er juin 2012, par danny

  I'm trying to figuring out how to install and use ffmpeg on windows 64 with XAMPP.

  I have flow this tutorial and install the ffmpeg-php librarys and I can see the expansion in the phpinfo().

  Now I put my ffmpeg.exe in the site root folder and I run this php script :

  extension_loaded('ffmpeg') or die('Error in loading ffmpeg');
  
  
  
  function convertTo( $input, $output ) 
  
  {
  
  echo $cmd = "ffmpeg -i $input $output";
  
  $outputData = array();
  
  exec( $cmd , $outputData);
  
  echo "<br />";
  
  print_r($outputData);
  
  }
  
  
  
  convertTo( "input.mp4", "output.flv" );

  and I get this output :

  ffmpeg -i input.mp4 output.flv
  
  Array ( )

  but no encoded file.
  My php safe mode is off and the movie file is in the root folder too.

  workplace info :

  • win7 64bit
  • XAMPP 1.7.2
  • Apache 2.2
  • php 5.3.5

  Help will be appreciated.