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• fate/matroska : Add test for zero-length Block

  25 avril 2020, par Andreas Rheinhardt

  fate/matroska : Add test for zero-length Block
  It furthermore tests the demuxer's handling of chained SeekHeads,
  
  level 1-elements after the Clusters and the muxer's capability of
  
  writing huge TrackNumbers as well as expanding the Cues' length field
  
  by one byte if necessary to fill the reserved space. It also tests
  
  propagation of metadata.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] tests/fate/matroska.mak
  • [DH] tests/ref/fate/matroska-zero-length-block

• How to get video length using ffmpeg

  21 janvier 2019, par Kevin

  I am getting the duration of video using following code,

  if (substr(php_uname(), 0, 7) == "Windows"){            
  
      $time = exec("{$ffmpeg} -i $path 2>&1 | findstr Duration"); 
  
  
  
      echo $time;
  
      exit;
  
  
  
      $duration = explode(":", $time);                
  
      $seconds = ($duration[0] * 3600) + ($duration[1] * 60) + round($duration[2]);   
  
      $minutes = $seconds/60;
  
      $real_minutes = floor($minutes);
  
      $real_seconds = round(($minutes-$real_minutes)*60);
  
      $length = $real_minutes.':'.$real_seconds;
  
  }

  $time shows the output like Duration: 00:00:06.52, start: 0.000000, bitrate: 350 kb/s but $duration shows only like Array ans $length shows 0:0 only for all videos. So how can i get video length please help me.

• avcodec/dvdsub_parser : Fix length check for short packets

  30 septembre 2022, par Aidan MacDonald

  avcodec/dvdsub_parser : Fix length check for short packets
  The DVD subtitle parser handles two types of packets : "normal"
  
  packets with a 16-bit length, and HD-DVD packets that set the
  
  16-bit length to 0 and encode a 32-bit length in the next four
  
  bytes. This implies that HD-DVD packets are at least six bytes
  
  long, but the code didn't actually verify this.
  The faulty length check results in an out of bounds read for
  
  zero-length "normal" packets that occur in the input, which are
  
  only 2 bytes long, but get misinterpreted as an HD-DVD packet.
  
  When this happens the parser reads packet_len from beyond the
  
  end of the input buffer. The subtitle stream is not correctly
  
  decoded after this point due to the garbage packet_len.
  Fixing this is pretty simple : fix the length check so packets
  
  less than 6 bytes long will not be mistakenly parsed as HD-DVD
  
  packets.
  Signed-off-by : Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
  
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DH] libavcodec/dvdsub_parser.c