add text to a video
import numpy as np
from moviepy.editor import *
from moviepy.video.tools.segmenting import findObjects
# WE CREATE THE TEXT THAT IS GOING TO MOVE, WE CENTER IT.
screensize = (720,460)
txtClip = TextClip('Cool effect',color='white', font="Amiri-Bold",
kerning = 5, fontsize=100)
cvc = CompositeVideoClip( [txtClip.set_pos('center')],
size=screensize)
# THE NEXT FOUR FUNCTIONS DEFINE FOUR WAYS OF MOVING THE LETTERS
# helper function
rotMatrix = lambda a: np.array( [[np.cos(a),np.sin(a)],
[-np.sin(a),np.cos(a)]] )
def vortex(screenpos,i,nletters):
d = lambda t : 1.0/(0.3+t**8) #damping
a = i*np.pi/ nletters # angle of the movement
v = rotMatrix(a).dot([-1,0])
if i%2 : v[1] = -v[1]
return lambda t: screenpos+400*d(t)*rotMatrix(0.5*d(t)*a).dot(v)
def cascade(screenpos,i,nletters):
v = np.array([0,-1])
d = lambda t : 1 if t<0 else abs(np.sinc(t)/(1+t**4))
return lambda t: screenpos+v*400*d(t-0.15*i)
def arrive(screenpos,i,nletters):
v = np.array([-1,0])
d = lambda t : max(0, 3-3*t)
return lambda t: screenpos-400*v*d(t-0.2*i)
def vortexout(screenpos,i,nletters):
d = lambda t : max(0,t) #damping
a = i*np.pi/ nletters # angle of the movement
v = rotMatrix(a).dot([-1,0])
if i%2 : v[1] = -v[1]
return lambda t: screenpos+400*d(t-0.1*i)*rotMatrix(-0.2*d(t)*a).dot(v)
# 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)]
clips = [ CompositeVideoClip( moveLetters(letters,funcpos),
size = screensize).subclip(0,5)
for funcpos in [vortex, cascade, arrive, vortexout] ]
# WE CONCATENATE EVERYTHING AND WRITE TO A FILE
final_clip = concatenate_videoclips(clips)
final_clip.write_videofile('../../coolTextEffects.avi',fps=25,codec='mpeg4')