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• avformat/dvdvideodec : Do not EOF on WAIT events

  27 juin 2024, par Marth64

  avformat/dvdvideodec : Do not EOF on WAIT events
  A DVDNAV_WAIT event by itself should not warrant an
  
  EOF when navigating the program stream. Some discs
  
  have WAIT events in the middle of a title, causing
  
  playback to end prematurely prior to this fix.
  Signed-off-by : Marth64 <marth64@proxyid.net>
  

  • [DH] libavformat/dvdvideodec.c

• php exec statement and single and double quotes confusion

  4 octobre 2015, par Anay Bose

  I am trying to overlay a png on the middle of a video. I am using ffmpeg. My syntax works well when I hardcode the image location (i.e. frames/watermark.png). But, I need to use a variable $dst to indicate the folder that contains the png image. The other variable i.e. $output_file fits well. I have tried various configurations, but cannot make it work. Maybe, your experienced eyes would readily detect the problems with single and double quotes.

  $dst = 'frames';
  
  $output_file = $dst . "/cut.mp4";
  
  
  
  $command = 'ffmpeg -i ' .$output_file. '  -vf "movie=' . $dst . '/watermark.png [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2: (main_h-overlay_h)/2 [out]" ' .$dst. '/part4.mp4';
  
  exec($command, $return, $array);
  
  var_dump($array); 

• Performant AV1 encoding, does it exist ?

  29 novembre 2022, par V O

  I'm developing a VoD application as a white label product that runs in a SaaS context using K8s. To enable streaming, I take the input video and re-convert it into HLS segments in multiple version and codecs to reach maximum compatibility.

  


  Yesterday I started implementing AV1 as codec, as it will in near future detach h264 as it's more efficient with the same level of compatibility across all the available browsers.
That was the point where things started to get strange, as I want to have this codec instead of h264 ^^.

  


  If you take a look at the following doc pages from ffmpeg : https://trac.ffmpeg.org/wiki/Encode/AV1

  


  You will notice that there are 3 main encoders available to handle encoding to av1. These are : libaom, SVT-AV1 and rav1e. No matter which one of these I try, the performance is slow, even slower than with HEVC. Recently I came along a news article about Netflix and that they are upgrading their library to AV1. If I take a look at the numbers of media elements Netflix offers, the amount is just huge, and I really don't understand how they did it. From what I know, SVT-AV1 is developed by Netflix in cooperation with Intel, So I assume they somehow rely on hardware encoding using an Intel CPU extension.

  


  Does somebody maybe know more and how they did it ? I really can't imagine that they just do CPU only encoding. A movie would take days to get encoded.

  


  Thanks in advance