ffmpeg里如何实现cubic-bezier曲线的效果

radrupt 发表于 2018-10-13 16:51:10

本帖最后由 radrupt 于 2018-10-14 22:31 编辑

效果如下
http://cubic-bezier.com/#1,.06,.66,1.04

radrupt 发表于 2018-10-14 22:32:45

这个问题目前已经搞定了
使用moviepy
import numpy as np
import bezier
from moviepy.editor import *
from moviepy.video.tools.segmenting import findObjects

# WE CREATE THE TEXT THAT IS GOING TO MOVE, WE CENTER IT.

screensize = (960,544)
txtClip = TextClip('王迪',color='white', font="MicrosoftYaHei",
               kerning = 5, fontsize=100)
cvc = CompositeVideoClip( ,
                     size=screensize)

# THE NEXT FOUR FUNCTIONS DEFINE FOUR WAYS OF MOVING THE LETTERS
print ( TextClip.list("font") )
nodes1 = np.asfortranarray([
,
,
])
# 三阶bezier curve
curve1 = bezier.Curve(nodes1, degree=3)

# for t in range(0,10):
# print(t,curve1.evaluate(t/10))

# 字符当前在屏幕上的位置，第几个字符，字符总数
def moveUp(screenpos,i,nletters):
v = np.array()
s = 1
d = lambda t : 1 if t <=s else 0
return lambda t: screenpos +d(t)*v*(320*(1-curve1.evaluate(t/s)))

# WE USE THE PLUGIN findObjects TO LOCATE AND SEPARATE EACH LETTER
letters = findObjects(cvc) # a list of ImageClips

# WE ANIMATE THE LETTERS

def moveLetters(letters, funcpos):
return [ letter.set_pos(funcpos(letter.screenpos,i,len(letters)))
         for i,letter in enumerate(letters)]

# 遍历函数数组，将灭一个函数赋值给CompositeVideoClip,
clip = CompositeVideoClip( moveLetters(letters,moveUp),
                           size = screensize).subclip(0,5)

# WE CONCATENATE EVERYTHING AND WRITE TO A FILE

clip.write_videofile('./new.mp4',fps=25,codec='mpeg4')

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ffmpeg里如何实现cubic-bezier曲线的效果