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• ffmpeg - How to change the filter-paramaters depending on time oder framenumber ?

  2 mars 2020, par LookAndSee

  Hallo to all userse and helpers here in this forum ! Thank you, i am new and i have found allready a lot of solutions.

  Now I want to ask, if someone can help me :

  I have a Movie about 30 seconds made of 1 image.
  Now I want to pixelate depending on time or framenumber - every time a litlle bit less.
  My code so far :

  ffmpeg -i in.mp4 -vf scale=iw/n:ih/n,scale=niw:nih:flags=neighbor out.mp4

  where n should be the framenumber 1 to 900.
  this scould also be t+1 for slower change.

  the stars are gone - so i mean n times iw:n times ih :

  error-massage :

  undefined constant or missing ’(’ in ’n’
  error when evaluating the expression ’ih/n’
  maybe the expression for out_w :’w/n’ or for out_h :’ih/n’ is self-referencing.
  failed to configure output pad on paresed_scale_0
  error reinitializing filters !
  failed to inject frame into filter network : invalid argument
  error while processing the decoded data for stream #0:0

  Do you have some suggestion plaese - Thank you in Advance

• FFMPEG loop video overlay smooth

  20 novembre 2018, par Young King

  I have :

  • 1 image(background.png)
  • 2 videos ( like a sticker will be added to image background by overlay options)

  videoA.mp4 (duration x second)
  videoB.mp4 (duration y second)

  I want to create smooth video by loop videoA and videoB with duration is multiples of x and y

  For example :
  x = 4s
  y = 6s

  Video output will be have duration 12s, videoA loop 3 times, videoB loop 2 times

  How can I create FFMPEG command.

• ffmpeg : use drawtext with quote inside text

  8 mai 2017, par Sulli

  I have a variable that takes its content from a file (I can’t change the content of the file) :

  echo $variable
  
  It's my variable

  I want to print that string on a video with ffmpeg :

  ffmpeg -nostdin -i input.mp4 -vf drawtext="text='$variable': fontcolor=white:box=1:boxcolor=black@0.8: x=h/70: y=h/5*4.2" -codec:a copy output.mp4

  when I do that, the quote inside $variable is not printed. I have read here that I need to escape the quote multiple times, some say 5 times, some say more.

  So I have tried to use

  variable=${variable//\'/'\\\\\'\'}

  to add between 1 and 10 backslashes, but it never worked : either nothing is printed, or \ are printed :

  It\s my variable

  Can someone tell me what is the correct syntax, or the correct number of backslashes I should add ?