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• ffmpeg : given a video of any length, create timelapse video of 6-8 seconds long

  14 mai 2018, par CDub

  I have an application which consumes video of any length (could be a few seconds, could be several minutes) and I want to use ffmpeg to return a "timelapse" version of the input video which will always be between 6 and 8 seconds long.

  I’ve been fiddling with the following :

  ffmpeg -y -i in.mp4 -r 10 -vf setpts='0.01*PTS' -an out.mp4

  Which seems to be a good start, but still generates very dynamic results given what in.mp4 is.

  I also don’t fully understand the verbiage in the ffmpeg documentation, so I’m not even sure what arguments to use for setpts, or if setpts is the correct filter I want to use.

• FFmpeg for automatic video generation from images ?

  22 janvier 2018, par Dionisis K

  I want to implement an automatic video generation from images, like facebook’s anniversary video. And I would also like to add some filters. I’ve been searching a lot and read FFmpeg’s documentation which is pretty amazing.

  In the future I want to have 10-20 "bashscripts" with different filters leading to different themes (e.g. fade-in, zoom, overlay images, left-to-right, etc..)

  So my biggest concern is having an interface which offers readable code and provides scalability. Since ffmpeg is a bashscript i searched for a wrapper

  There are wrappers in

  • https://github.com/PHP-FFMpeg/PHP-FFMpeg for php ,which doesn’t support image convertion to videos and complex filters .
  • https://github.com/fluent-ffmpeg/node-fluent-ffmpeg which looks promising but also difficult to go with complex filters
  • and https://github.com/kkroening/ffmpeg-python for python.I think that it s pretty good

  Are there any other wrappers worth to check ?
  Would you recommend something from the above ?
  Is there any pros and cons using a specific programming language for this particular case ?
  Is there anything else i should bear in mind before I make a decision ?

• Create muted video and black screen video with FFmpeg on OS X

  22 septembre 2017, par user2685832

  I’m trying to use FFmpeg on OS X to generate the following from a local mp4-file :

  • A copy of the original video with no audio
  • A copy of the original video with audio but without visuals (a black screen instead). This file also needs to be in mp4 format.

  After reading through the documentation I am struggling to get the terminal commands right. To remove the audio I have tried this command without any success :

      ffmpeg -i file.mp4 -map 0:0 -map 0:2 -acodec copy -vcodec copy

  Could anyone guide me towards how to accomplish this ?

  Thanks !