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• ffmpeg : how to extract 1st video, english audio and french subtitle from video file in one command line ?

  15 mai 2020, par Sxilderik

  I have read many posts related to extracting streams per language with ffmpeg, but it seems that the -map 0:m:language:xxx is global, and goes for all streams.

  



  Let’s say I have a video file that contains hopefully one english audio stream and some french subtitle streams, among possibly many other streams. I want to get a smaller file with the first video track, the (first) english audio stream and all the french subtitle streams.

  



  If I run

  



  ffmpeg -i "$file" -map 0:v:0 -vcodec copy -map 0:m:language:eng -acodec copy -map 0:m:language:fre -scodec copy -f matroska "${file%.*}.mkv_out"


  



  I get in file.mkv_out all audio and subtitle tracks which are either french or english.

  



  Is there a way to achieve this, without having any prior knowledge of track numbers in the original file ?

  



  Thanks.

  


• Use ffmpeg to move moov atom to front of mp4 file on Google Cloud Platform and Google Cloud Storage

  19 avril 2021, par BlueBoy

  I would like to use ffmpeg to move the moov atom of a .mp4 file to the front of the file so that it can then be streamed.

  


  The .mp4 file is in Google Cloud Storage. I want to take that file and apply the conversion on it (or copy it if needed).

  


  I have successfully run the following command in the terminal and it works. I want to essentially run this command server side on the Google Cloud in a Java environment :

  


  ffmpeg -i input_video_file.mp4 -vcodec copy -acodec copy -movflags faststart output_video_file.mp4

  


  I can get my file from Google Cloud Storage like this :

  


  GcsService gcsService = GcsServiceFactory.createGcsService();
GcsFilename file = new GcsFilename("bucket", "folder/filename;


  


  I was able to find a Java library wrapper for ffmpeg (https://github.com/bramp/ffmpeg-cli-wrapper) but it doesn't seem to allow to move the moov atom. Could anyone help me figure this out further ? Is there a

  


• 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 :