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• Adjusting video length to fit audio length in FFmpeg

  8 avril 2015, par Spreadys

  This has been driving me mad !
  I have video.avi, a raw uncompressed video with a duration of 6mins
  I have audio.wav, a raw uncompressed audio with a duration of 9mins

  I need to mux these together, but map the timing information from the audio.
  Using Vsync 2 I would hope that video frames get duplicated in order to do this.

  My current (failed) attempt is

  ffmpeg -i video.avi -i audio.wav
   c:v rawvideo -c:a copy
   vsync 2 -map 0:0,1:0 -map 1:0,1:0
  newvideo.avi

  My understanding is that the -map first designates what file:stream, and this is followed by the file:stream to be used for timing information.

  I have attempted all my usual research methods in an attempt to avoid asking but it is still resulting in the avi container holding two streams with the video length unchanged.
  If anyone can shed some light on my errors, I would be very grateful....or if you need further info - please ask !

  Thanks
  David

  Any guidance on what other information may promote some suggestions to where i’m going wrong also appreciated.
  Thanks

• 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 :
  
  

  
  
  

• png : Set the color range as full range

  8 mai 2015, par wm4

  png : Set the color range as full range
  The format uses full range for the gray formats.
  CC : libav-stable@libav.org
  

  • [DBH] libavcodec/pngdec.c