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• 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 - 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

• Syncing decoded video using Ffmpeg

  30 juin 2012, par Infiniti Fizz

  I am using Ffmpeg to decode and play video files. I have currently got the video playing and the audio playing at as fast as the CPU can decode and display them. The problem is that I want to play the video and audio in sync using the system clock.

  I've searched around for some help but can't find anything substantial other than dranger's tutorial 05 but I don't really understand what he is doing because my program isn't written in the same way as his.

  I am using mjpeg files and so the pts seems to be retrieved every single time a frame is decoded, I have multiplied the pts by the time_base as dranger does to get the value in seconds but the resolution seems to be only seconds and so I get the value "6" 25 times and then "7" 25 times as the video runs at 25 frames per second.

  Is there not a more accurate value ? Or way to get a more accurate value and if so, how would I go about syncing to this value ? I am using SDL to display the value so can I just use a SDL_Delay() of the value I get ?

  Thanks for your time,

  Infinitifizz