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• FFmpeg : Trying to fade out first and later fade back in doesn't work [duplicate]

  6 septembre 2023, par Paul S

  While I just became a registered user on the site, I've been utilizing Stack Overflow for years, virtually always being able to find solutions to problems I've encountered. Unfortunately, not this time ; I have encountered a problem with the ffmpeg video fade filter. There are lots of previously proposed issues along with their solutions, but none (that I can find) that address a twist that I have.

  


  Most questions ask, "how do I fade in", or "how do I fade out", and "how do I fade in at the beginning and fade out at the end." If I want to fade in and later fade out, my below code works just fine.

  


  ffmpeg -ss 00.0 -accurate_seek -to 15.0 -i My.Test.File.mkv -c:v h264 -vf fade=t=in:st=0:d=2,fade=t=out:st=13:d=2 -b:v 825k -s 1280x720 -r 29.97 -c:a aac -ar 44100 -ac 2 -b:a 96k output.mp4


  


  However, I actually want to fade out somewhere in the middle, and then fade back in shortly after, and that doesn't seem to work. I structured the ffmpeg command as so :

  


  ffmpeg -ss 00.0 -accurate_seek -to 15.0 -i My.Test.File.mkv -c:v h264 -vf fade=t=out:st=6:d=2,fade=t=in:st=9:d=2 -b:v 825k -s 1280x720 -r 29.97 -c:a aac -ar 44100 -ac 2 -b:a 96k output.mp4


  


  This fails and yields a completely blank video. I've also tried some -filter_complex variations, but get similar results ; fading in and later fading out works, but fading out and later fading in does not.

  


  I'm using the latest ffmpeg windows version on Windows 10. I would have attached a sample video file but I'm seeing how to do that. It is not the original video file that started my issue, but it does duplicate the issue. Not sure what other info might help in coming up with a solution. Thoughts ?

  


• ffmpeg - trying to add a reversed section of original video to the back (boomerang effect)

  23 janvier 2020, par sn0ep

  I have a ffmpeg command as follows which basically scales the video down to 720p. Now i want to add a section to my command which will make a concatination of the video but in reverse. So that the video will also be in a loop like this :

  0s -> 10s -> 0s

  original command :

  ffmpeg -ss 0.0 -to 10.0 -i in.mp4 -filter_complex "fps=15,scale=720:-1" -y out.mp4

  Command after my edits :

  ffmpeg -ss 0.0 -to 10.0 -i in.mp4 -filter_complex "[0:v]fps=15,scale=720:-1,reverse,fifo[r];[0:v][r] concat=n=2:v=1 [v]" -map "[v]" -y out.mp4

  When executing im getting following erorrs :

  Parsed_concat_4 @ 0x7feb89d01d40] Input link in1:v0 parameters (size 720x1280, SAR 1:1) do not match the corresponding output link in0:v0 parameters (1080x1920, SAR 1:1)
  
  [Parsed_concat_4 @ 0x7feb89d01d40] Failed to configure output pad on Parsed_concat_4
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:1

  I’m very new into coding advanced ffmpeg commands.

• Evolution #3591 : Améliorer l’ergonomie de l’insertion de docs/images dans les contenus

  16 janvier 2018, par RastaPopoulos ♥

  Je mets 3.3 puisque justement la roadmap était de travailler sur l’insertion de docs pour la 3.3.