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• Cloaked Archive Wiki

  16 mai 2011, par Multimedia Mike — General

  Google’s Chrome browser has made me phenomenally lazy. I don’t even attempt to type proper, complete URLs into the address bar anymore. I just type something vaguely related to the address and let the search engine take over. I saw something weird when I used this method to visit Archive Team’s site :

  
  
  

  There’s greater detail when you elect to view more results from the site :

  
  
  

  As the administrator of a MediaWiki installation like the one that archiveteam.org runs on, I was a little worried that they might have a spam problem. However, clicking through to any of those out-of-place pages does not indicate anything related to pharmaceuticals. Viewing source also reveals nothing amiss.

  I quickly deduced that this is a textbook example of website cloaking. This is when a website reports different content to a search engine than it reports to normal web browsers (humans, presumably). General pseudocode :

  PLAIN TEXT

  C :

  1. if (web_request.user_agent_string == CRAWLER_USER_AGENT)
  2.  return cloaked_data ;
  3. else
  4.  return real_data ;

  You can verify this for yourself using the wget command line utility :

  <br />
$ wget --quiet --user-agent="<strong>Mozilla/5.0</strong>" \<br />
 http://www.archiveteam.org/index.php?title=Geocities -O - | grep \&lt;title\&gt;<br />
&lt;title&gt;GeoCities - Archiveteam&lt;/title&gt;

  $ wget —quiet —user-agent="Googlebot/2.1"
  http://www.archiveteam.org/index.php?title=Geocities -O - | grep \<title\>
  <title>Cheap xanax | Online Drug Store, Big Discounts</title>
  

  I guess the little web prank worked because the phaux-pharma stuff got indexed. It makes we wonder if there’s a MediaWiki plugin that does this automatically.

  For extra fun, here’s a site called the CloakingDetector which purports to be able to detect whether a page employs cloaking. This is just one humble observer’s opinion, but I don’t think the site works too well :
  
  

  
  
  

• mpeg4videodec : move MpegEncContext.shape to Mpeg4DecContext

  26 novembre 2013, par Anton Khirnov

  mpeg4videodec : move MpegEncContext.shape to Mpeg4DecContext
  

  • [DBH] libavcodec/h263dec.c
  • [DBH] libavcodec/ituh263dec.c
  • [DBH] libavcodec/mpeg4video.h
  • [DBH] libavcodec/mpeg4video_parser.c
  • [DBH] libavcodec/mpeg4videodec.c
  • [DBH] libavcodec/mpegvideo.c
  • [DBH] libavcodec/mpegvideo.h

• Bitrate choice for h265 codec if CRF NOT Supported,MEDIA_CODEC [closed]

  5 septembre 2023, par strider

  How to choose optimal bitrate for encoding to a h265 codec, if h265 codec does NOT support any kind of CRF option ?

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  I believe the codec supports variable bitrate.

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  Is there an optimal ratio between bitrates of x264/XVID and h265 codecs ?&#xA;I.e. is there a general coefficient that I could multiply given x264 average bitrate to get h265 bitrate ?&#xA;(I guess we will have to assume a certain h265 preset here). Let the preset be medium or default for this question.

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  Usually its for long-term storage and to reduce file size.

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  Specifically I'm talking about hardware h265/HEVC MEDIA_CODEC for Android and FFMPEG. I'm just learning it, but it does not seem to have many options (does it support PRESET ?).&#xA;Any real life sample encoding FFMPEG command for hardware h265 MEDIA_CODEC with FFMPEG (e.g. for a movie) would be very helpful.

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  Is there a reference table for h265 bitrates for common video formats like Bluray, etc ?

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  Is there a way to output average video track bitrate with FFMPEG or other free tool ? (usually its x264 or mpeg2).

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  Unfortunately there's no non-android device I currently have with hardware h265 encoding support or with a multicore CPU.

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