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• ChromaKey FLV Transparency

  1er décembre 2012, par Mr D

  I have over 20000 FLV's at the moment. They currently have no alpha channel and are all CGI generated text on a black background.

  My issue :
  I need to be able to remove the black background and make it transparent, so I can use these videos to layer over pictures in my flash project.

  It needs to be an automated process, that can go through the whole dir of videos and remove the backgrounds

  What I've tried ?

  I have spent the last three days pulling my hair out. Currently the option I see is to write a custom filter for ffmpeg.

  The end goal :

  Layer the flv videos over randomly generated videos in an adobe air application built in flex.

• Decode mp4 to raw frames windows c++

  27 septembre 2012, par p.streef

  I'm trying to decode an MP4 file i've created using mp4creator library. I can't find a ffmpeg or libav example that actually works with the libraries, because the code is incompatible with the examples.

  I need a simple way of reading the mp4 file and decoding it into raw audio and video frames. In needs to work on windows too.

  If someone can point me towards a working and compatible ffmpeg/libav library + example source file that could work too.

  If i could get the library version which was used in this tutorial that would work, since this guy seems to be the only one who wrote a decent tutorial on FFMPEG (albeit on some ancient version)
  http://dranger.com/ffmpeg/

  edit :

  In the latest version of ffmpeg i found the example named : filtering_video.c
  using a patch found : http://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/126587.html I have gotten the program to do "something" It looks to be working so I will investigate further.

• What encoding settings for BlackBerry HTML5 streaming ?

  27 septembre 2012, par user1441859

  For several days I've been desperately trying to get my videos stream on BlackBerry as well as the major desktop and mobile browser.
  The videos are embedded in this way :

  <video preload="auto" controls="controls">
  
  <source src="url.mp4" type="video/mp4"></source>
  
  <source src="url.ogv" type="video/ogv"></source>
  
  //flash fallback
  
  </video>

  When opening the page in the BB browser the black video frame with the controls appears but when I try to play the video the frame stays black and displays an error message : "Video portion is of an unsupported format".
  Sound does play however.

  By now I have tried H.264 and mpeg4 with AAC audio and both of them don't play properly on my BB (OS version 6.0).
  I've been using ffmpeg to encode the files.