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• FFMPEG : Overlaying one video on another one, and making black pixels transparent

  26 juillet 2016, par Michael A

  I’m trying to use FFMPEG to create a video with one video overlayed on top another.

  I have 2 MP4s. I need to make all BLACK pixels in the overlay video transparent so that I can see the main video underneath it.

  I found two ways to overlay one video on another :

  First, the following positions the overlay in the center, and therefore, hides that portion of the main video beneath it :

      ffmpeg -i 1.mp4 -vf "movie=2.mp4 [a]; [in][a] overlay=352:0 [b]" combined.mp4 -y

  And, this one, places the overlay video on the left, but it’s opacity is set to 50% so at least other one beneath it is visible :

  ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS[top]; [1:v]setpts=PTS-STARTPTS, format=yuva420p,colorchannelmixer=aa=0.5[bottom]; [top][bottom]overlay=shortest=0" -acodec libvo_aacenc -vcodec libx264 out.mp4 -y

  My goal is simply to make all black pixels in the overlay (2.mp4) completely transparent. How can this be done.

• Revision 9c05172d0a : intrapred_test : drop '_t' from local typenames _t is reserved by posix + switc

  17 juillet 2014, par James Zern

  Changed Paths :
   Modify /test/intrapred_test.cc

  
  
  intrapred_test : drop ’_t’ from local typenames

  _t is reserved by posix

  + switch to camelcase
  http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Type_Names

  Change-Id : I74d7489ea35f988fcfec3651bd16f02e688e406a

• Revision 25d74e69dd : pp_filter_test : drop '_t' from local typenames _t is reserved by posix + switc

  17 juillet 2014, par James Zern

  Changed Paths :
   Modify /test/pp_filter_test.cc

  
  
  pp_filter_test : drop ’_t’ from local typenames

  _t is reserved by posix

  + switch to camelcase
  http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Type_Names

  Change-Id : If6cf006a089b0fb42d6bf050570d928d955d658a