字幕大小变化效果

moviepy==1.0.2

字幕由大变小，由具体大到具体小

from moviepy.editor import TextClip, CompositeVideoClip
from moviepy.video.fx.resize import resize

screen_size = (800, 600)

initial_fontsize = 100
final_fontsize = 50
txt_clip = TextClip("Hello World", fontsize=initial_fontsize, color='white', font="Arial")

duration = 5

resize_func = lambda t: max(final_fontsize, initial_fontsize - (initial_fontsize - final_fontsize) * t / duration)

txt_clip = resize(txt_clip, lambda t: resize_func(t) / initial_fontsize).set_duration(duration).set_pos('center')

final_clip = CompositeVideoClip([txt_clip], size=screen_size)

final_clip.write_videofile("text_shrinking.mp4", fps=24)

由小变大

# 固定放大放大大小
from moviepy.editor import TextClip, CompositeVideoClip
from moviepy.video.fx.resize import resize

screen_size = (800, 600)

initial_fontsize = 50
final_fontsize = 100
txt_clip = TextClip("Hello World", fontsize=initial_fontsize, color='white', font="Arial")

duration = 5

resize_func = lambda t: initial_fontsize + (final_fontsize - initial_fontsize) * t / duration

txt_clip = resize(txt_clip, lambda t: resize_func(t) / initial_fontsize).set_duration(duration).set_pos('center')

final_clip = CompositeVideoClip([txt_clip], size=screen_size)

final_clip.write_videofile("text_shrinking.mp4", fps=24)