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• FFMPEG - Merging Videos with Transparency

  4 juillet 2013, par user1829136

  I am trying to merge two videos together, both have transparency, using the command

  ffmpeg.exe -i person2.mov -vf "[in] scale=iw/2:ih/2,fade=out:300:30:alpha=1, pad=2*iw:ih [left] ; movie=person2.mov, scale=iw/2:ih/2,fade=out:300:30:alpha=1 [right] ; [left][right] overlay=main_w/3:0,fade=out:300:30:alpha=1 [out]" -b:v 768k Output_people.mov

  By doing that I get the following output :

  http://i263.photobucket.com/albums/ii122/Fernando461/Untitled.png

  As you can see, it was possible to get the two videos to be on top of each other. But then, when I try to merge this video (Output_people.mov) with another video, it doesn't have the same transparency. Is it possible to keep transparency in the outcome ?

  Edit 1 :

  This is the output I get : https://www.dropbox.com/s/gpid1pptfio31gd/ffmpeg-20130701-193206.log

  And by "it doesn't have the same transparecy" I meant that the background is black instead of being transparent, so if I put one video on top of each other, the one in the back is covered by a black part of the one in the front.

  Edit 2 :
  Adding -vcodec qtrle to the code worked. Thanks mark4o !

• Evolution #4105 : Constante ou config ?

  28 février 2018, par cam.lafit -

  Salut

  monplugin_lire_config($metas) 
      // Je force une config
      $metas[’albums’][’activer_trucmuche’] = true ;
      return $metas ;
  
  
  

  Tu proposes donc d’utiliser une fonction de lecture pour écrire, c’est
  sur que c’est plus compréhensible :) Ce point est peut être à revoir.

• Stop/cancel execution of FFmpeg command

  5 juin 2018, par user155

  There is FFmpeg Static (binary) available for Android and we can stop/cancel some FFmpeg execution (command) while it’s doing something https://github.com/WritingMinds/ffmpeg-android-java/issues/33

  But I want to use FFmpeg shared libraries and JNI, I found next library https://github.com/IljaKosynkin/FFmpeg-Development-Kit (it works ok)

  But there is no option to stop execution of FFmpeg command (or killing the process)

  We use Java native run method there to start execute some command :

  Java :
  https://github.com/IljaKosynkin/FFmpeg-Development-Kit/blob/master/JNI/app/src/main/java/com/example/ilja/jni/VideoKit.java#L57

  and then in C we call FFmpeg’s main method :

  C :
  https://github.com/IljaKosynkin/FFmpeg-Development-Kit/blob/master/JNI/app/jni/videokit.c#L41

  How can I stop/cancel some FFmpeg executing after I called Java run and C main methods ?