How to make one video from two videos with a transition in between?

Answers

• kfrajer

  April 2017

  Check this:

  https://forum.processing.org/two/discussion/21999/how-to-create-a-basic-transition-effect-between-two-videos#latest

  Kf
• Coltsjd55

  April 2017

  Yes i saw this post but the example provided by jeremy douglas plays 2 movies at the same time on a loop and fades between them. Im looking to start the fade from mov1 to mov2 wit 5 seconds left in mov1 and make a new movie, mov3.
• kfrajer

  April 2017

  Did you check that link? @jeremydouglass did a good demonstration of how to do it.

  Btw, what kind of transition do you want? Fading like alpha masking changing between videos?

  I wonder if the ffmpeg has a filter that would allow this: https://forum.processing.org/two/discussion/comment/95847/#Comment_95847 However, this one will require more work and reading the documentation.

  kf
• Coltsjd55

  April 2017

  yes i did follow his link, the example shown there works differently, it loops both videos at the same time and fades between them, restarting the fade (not the whole sequence) when space key is pressed. Im looking for one sequence of events, mov1 starts, with 5 seconds left start the fade into mov2, fade ends 5 seconds into mov2, mov2 finishes playing. I like how he implements the fade in his example with the tint, that is the transition im looking for.
• jeremydouglass

  May 2017

  @Coltsjd55 --

  The sketch suggested shows how to implement the fade itself based on a fadeStartTime.

  Based on your description you presumably want an approach like this:

  1. pressing a key
     • sets playStartTime (e.g. 3 seconds)
     • stops both movies (in case they are already playing)
     • starts playing movie1.
     • ... don't play movie2 yet. don't loop either of them.
     • sets fadeStartTime as per the earlier example.
  2. fadeStartTime = current time (3s) + movie1 length (e.g. 10s) - fade length (5s) = 8 seconds.
  3. when millis()>fadeStartTime triggers the fade (as per example sketch), also start playing movie2.
  4. "press a key to reset" automatically works in design -- there is no difference between "start" and "reset."

  The problem with code for crossfading sequences is that they are very dependent on the editing logic -- do you want the fade-ins and outs to always happen at the same time, should they be the same length, does one movie always trigger another (or more than one), should the sequence be fixed or random, does each clip play for a fixed period or for the full length of its file, should the end loop back to the beginning, etc. etc. etc.... there isn't one formula -- just think carefully about what you want to do.
• jeremydouglass

  May 2017 edited May 2017

  You may also be interested in these discussions of different approaches to playing video sequences (sans cross-fading):

  • https://forum.processing.org/two/discussion/20237/manipulate-consecutive-videos
  • https://forum.processing.org/two/discussion/14990/movie-begin-and-end-events
  • https://forum.processing.org/two/discussion/8109/prepare-a-second-video-to-play-without-slowing-down-the-first-video