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• FFMPEG crop boundaries animation

  28 septembre 2021, par VlFedotov

  I'm looking for a way to make crop filter params depends on current time.

  


  Now I have 2 videos - white and aqua squares in one split output video, and this code works fine :

  


  ffmpeg -i out/i1.mp4 -i out/i2.mp4 -filter_complex "[0:v]crop=iw/2:ih:0:0[left];[1:v]crop=iw/2:ih:ow:0[right];[left][right]hstack" out/generated.mp4


  


  My question is - how to make the border between two videos floating, animated ? For example from left side of output vide to the right ?

  


  I already tried to use t param, e.g. like this :

  


  ffmpeg -i out/i1.mp4 -i out/i2.mp4 -filter_complex "[0:v]crop=iw/2+t:ih:0:0[left];[1:v]crop=iw/2-t:ih:ow:0[right];[left][right]hstack" out/generated.mp4


  


  But it throws an error :

  


  [Parsed_crop_0 @ 0x7fa46060eec0] Error when evaluating the expression 'iw/2+t'

[Parsed_crop_0 @ 0x7fa46060eec0] Failed to configure input pad on Parsed_crop_0

Error reinitializing filters!

Failed to inject frame into filter network: Invalid argument

Error while processing the decoded data for stream #1:0


  


  Can anybody help me to solve this ? Or explain - why it isn't possible ?

  


• avcodec/h274 : add film grain synthesis routine

  17 août 2021, par Niklas Haas

  avcodec/h274 : add film grain synthesis routine
  This could arguably also be a vf, but I decided to put it here since
  
  decoders are technically required to apply film grain during the output
  
  step, and I would rather want to avoid requiring users insert the
  
  correct film grain synthesis filter on their own.
  The code, while in C, is written in a way that unrolls/vectorizes fairly
  
  well under -O3, and is reasonably cache friendly. On my CPU, a single
  
  thread pushes about 400 FPS at 1080p.
  Apart from hand-written assembly, one possible avenue of improvement
  
  would be to change the access order to compute the grain row-by-row
  
  rather than in 8x8 blocks. This requires some redundant PRNG calls, but
  
  would make the algorithm more cache-oblivious.
  The implementation has been written to the wording of SMPTE RDD 5-2006
  
  as faithfully as I can manage. However, apart from passing a visual
  
  inspection, no guarantee of correctness can be made due to the lack of
  
  any publicly available reference implementation against which to
  
  compare it.
  Signed-off-by : Niklas Haas <git@haasn.dev>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/h274.c
  • [DH] libavcodec/h274.h

• AttributeError while saving an animation using celluloid, Python 3.9

  26 juillet 2021, par rafael gf

  I'm trying to create a simple animation using the celluloid library, but I'm getting an attribute error when trying to save it. I'm not familiar with ffmpeg, but I read I should install it and point to its executable file for the saving to work, not sure what's going wrong. The massage I'm getting is :

  


  Exception has occurred: AttributeError&#xA;type object &#x27;FuncAnimation&#x27; has no attribute &#x27;_first_draw_id&#x27;&#xA; File "C:\Users\Fernando\Documents\Circulos\circulos.py", line 102, in <module>  anim.save(anim, filename="my_animation.gif", writer=FFwriter)&#xA;</module>

  


  I'll out the simplification version of the code below - I'm suppressing the part where I do some tucking with the circles, but I've done some testing plot by plot and it is working fine.

  


  import smtplib, os
import matplotlib.pyplot as plt
from matplotlib import animation
import math
from celluloid import Camera

plt.rcParams['animation.ffmpeg_path'] = os.getcwd() + '\\Circulos\\ffmpeg\\bin\\ffmpeg.exe'


#axes
figure, axes = plt.subplots()
axes.set_aspect(1)
axes.set_xlim((-xmax(C)),(xmax(C)))
axes.set_ylim((-ymax(C)),(ymax(C)))

b = 0

#add initial circles
for a in range 5:
    draw_circle = plt.Circle((a, a), 2, fc = 'None', ec = 'r')
    axes.add_artist(draw_circle)


#create figure and camera
figure, axes = plt.subplots()
axes.set_aspect(1)
axes.set_xlim((-xmax(C)),(xmax(C)))
axes.set_ylim((-ymax(C)),(ymax(C)))
camera = Camera(figure) 

Frame_time = 10

for b in range(Frame_time):

     #add circles
     for a in range 5:
        draw_circle = plt.Circle((a, a), 2, fc = 'None', ec = 'r')
        axes.add_artist(draw_circle)

    #Frame Picture
    camera.snap()


#create animation
anim = camera.animate()
anim = animation.FuncAnimation
FFwriter = animation.FFMpegWriter()
anim.save(anim, filename="my_animation.gif", writer=FFwriter)


  


  I'm working on VS code, the latest version I just updated it, and python 3.9