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• FFMPEG - Watermark in Random Position

  13 octobre 2018, par gbvisconti

  I need to make a watermark in my video with the following loop :

  1. Appear in a random position on the video.
  2. Fade out after 3 seconds.
  3. Appear again after random seconds.

  I have read documentation and also found a forum with similar solution, that is almost what I need.

  ffmpeg -i video.mp4 -c:v libx264 -preset veryfast -crf 23 -tune zerolatency -vendor ap10 -pix_fmt yuv420p -filter:v drawtext=fontfile=arial.ttf:text='WatermarkTextHere':fontcolor=black@0.5:fontsize=16:x=if(eq(mod(n\,200)\,0)\,sin(random(1))*w\,x):y=if(eq(mod(n\,200)\,0)\,sin(random(1))*h\,y) -c:a copy outvideo2.mp4

  I don’t know how to adapt correctly yet.

  EDIT

  After some hours I managed to get this. It fades in and out, but is not really random. The logo.png only appears mostly in upper left area of the video. How to make it appear more random in any area of the video ?

  ffmpeg -i input.mp4 -loop 1 -i logo.png -filter_complex "[1]trim=0:30,fade=in:st=0:d=1:alpha=1,fade=out:st=9:d=1:alpha=1,loop=999:750:0,setpts=N/25/TB[w];[0][w]overlay=shortest=1:x=if(eq(mod(n\,200)\,0)\,sin(random(1))*w\,x):y=if(eq(mod(n\,200)\,0)\,sin(random(1))*h\,y)" output.mp4

• ffmpeg copy video in video with a specific time

  13 février 2017, par Alkl

  Im new in this topic (beginner) and Im german... So it’s a bit difficult to find the correct words...

  I’ll try to explain what I’ve done and what I want to do :

  1. Extract video area from the original video converted in PRORES codec :

     ffmpeg.exe -i test.mkv -ss 00:06:21.99 -t 00:00:01.94 -async 1 -strict -2 -c:v prores_ks -pix_fmt yuva444p10le -profile:v 4444 -bits_per_mb 8000 -s 1920x1080 cut_video.mov

  2. Edit the cut in After Effects

  3. Convert the PRORES in Matroska

     ffmpeg.exe -i "C :\Users\Alex\Desktop\ffmpeg-20170202-08b0981-win64-static\bin\cut_video\cut_video.mov" -vcodec ffv1 -acodec pcm_s16le temp.mkv

  4. Replace the video area in the originale video file at the time 00:06:21.99...

  I spend 4 hours for the two commands...
  So I despair at the fourth step. Is it possible ? Can you help me ?

  I made a picture, so you can understand better what Im doing... : http://i.imgur.com/HqlNxzW.jpg

  Best regards from germany,

  Alex

• Unable to record video using FFMPEG in Python

  23 mai 2019, par user1932747

  I have this animation generated using python. And once it generates, it’s supposed to make a a video. I’ve gotten as far as creating the file, however I get a traceback error. And when I attempt to open the file, there’s nothing in it.

  Windows 10, running python 3.

  I’ve messed with the PATH of ffmpeg, placed it directly in the folder. I removed a piece of code that generated a unique file name. And replaced it with a string. No file was being generated at all prior to that.

  I also tried to change the codecs, still nothing.

  The code that creates video :

  plt.show()
  
  animation.save('Output_Test.mp4', fps=30, extra_args=['-vcodec', 'libx264'])

  I expect to just get a video that says Output_Test.mp4. Which I do get, but it’s empty.

  Traceback Error :

  Traceback (most recent call last):
  
    File "C:\Users\andre\OneDrive\Desktop\FranchiseRevenueComparison-master\FranchiseAnimation.py", line 277, in <module>
  
      animation.save('Output_Test.mp4', fps=30, extra_args=['-vcodec', 'libx264'])
  
    File "C:\Users\andre\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\animation.py", line 1139, in save
  
      anim._init_draw()
  
    File "C:\Users\andre\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\animation.py", line 1732, in _init_draw
  
      self._draw_frame(next(self.new_frame_seq()))
  
    File "C:\Users\andre\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\animation.py", line 1755, in _draw_frame
  
      self._drawn_artists = self._func(framedata, *self._args)
  
    File "C:\Users\andre\OneDrive\Desktop\FranchiseRevenueComparison-master\FranchiseAnimation.py", line 259, in animate
  
      self.ax.figure.canvas.draw()
  
    File "C:\Users\andre\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 10, in draw
  
      _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
  
    File "C:\Users\andre\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\backends\_backend_tk.py", line 77, in blit
  
      photoimage.blank()
  
    File "C:\Users\andre\AppData\Local\Programs\Python\Python37-32\lib\tkinter\__init__.py", line 3548, in blank
  
      self.tk.call(self.name, 'blank')
  
  _tkinter.TclError: invalid command name "pyimage10"
  
  </module>

  RESOLVED :

  I just had to reverse the order of plot and save.