我有一系列的图片,我想从中创建一个视频。理想情况下,我可以为每帧指定帧持续时间,但固定的帧速率也可以。我在wxPython中这样做,所以我可以渲染到wxDC或我可以将图像保存到文件,如PNG。是否有一个Python库,将允许我创建一个视频(AVI, MPG等)或一个动画GIF从这些帧?
编辑:我已经尝试过PIL,它似乎不起作用。有人能用这个结论来纠正我吗?这个链接似乎支持我关于PIL的结论:http://www.somethinkodd.com/oddthinking/2005/12/06/python-imaging-library-pil-and-animated-gifs/
我偶然发现了PIL的ImageSequence模块,它提供了更好(更标准)的GIF动画。这次我也使用了Tk的after()方法,这比time.sleep()更好。
from Tkinter import *
from PIL import Image, ImageTk, ImageSequence
def stop(event):
global play
play = False
exit()
root = Tk()
root.bind("<Key>", stop) # Press any key to stop
GIFfile = {path_to_your_GIF_file}
im = Image.open(GIFfile); img = ImageTk.PhotoImage(im)
delay = im.info['duration'] # Delay used in the GIF file
lbl = Label(image=img); lbl.pack() # Create a label where to display images
play = True;
while play:
for frame in ImageSequence.Iterator(im):
if not play: break
root.after(delay);
img = ImageTk.PhotoImage(frame)
lbl.config(image=img); root.update() # Show the new frame/image
root.mainloop()
一个制作动图的简单函数:
import imageio
import pathlib
from datetime import datetime
def make_gif(image_directory: pathlib.Path, frames_per_second: float, **kwargs):
"""
Makes a .gif which shows many images at a given frame rate.
All images should be in order (don't know how this works) in the image directory
Only tested with .png images but may work with others.
:param image_directory:
:type image_directory: pathlib.Path
:param frames_per_second:
:type frames_per_second: float
:param kwargs: image_type='png' or other
:return: nothing
"""
assert isinstance(image_directory, pathlib.Path), "input must be a pathlib object"
image_type = kwargs.get('type', 'png')
timestampStr = datetime.now().strftime("%y%m%d_%H%M%S")
gif_dir = image_directory.joinpath(timestampStr + "_GIF.gif")
print('Started making GIF')
print('Please wait... ')
images = []
for file_name in image_directory.glob('*.' + image_type):
images.append(imageio.imread(image_directory.joinpath(file_name)))
imageio.mimsave(gif_dir.as_posix(), images, fps=frames_per_second)
print('Finished making GIF!')
print('GIF can be found at: ' + gif_dir.as_posix())
def main():
fps = 2
png_dir = pathlib.Path('C:/temp/my_images')
make_gif(png_dir, fps)
if __name__ == "__main__":
main()
我使用images2gif.py,这很容易使用。它似乎是文件大小的两倍。
26个110kb的PNG文件,我期望26*110kb = 2860kb,但my_gif.GIF是5.7mb
另外,因为GIF是8位的,好看的png在GIF中变得有点模糊
下面是我使用的代码:
__author__ = 'Robert'
from images2gif import writeGif
from PIL import Image
import os
file_names = sorted((fn for fn in os.listdir('.') if fn.endswith('.png')))
#['animationframa.png', 'animationframb.png', 'animationframc.png', ...] "
images = [Image.open(fn) for fn in file_names]
print writeGif.__doc__
# writeGif(filename, images, duration=0.1, loops=0, dither=1)
# Write an animated gif from the specified images.
# images should be a list of numpy arrays of PIL images.
# Numpy images of type float should have pixels between 0 and 1.
# Numpy images of other types are expected to have values between 0 and 255.
#images.extend(reversed(images)) #infinit loop will go backwards and forwards.
filename = "my_gif.GIF"
writeGif(filename, images, duration=0.2)
#54 frames written
#
#Process finished with exit code 0
以下是26帧中的3帧:
缩小图像会减小尺寸:
size = (150,150)
for im in images:
im.thumbnail(size, Image.ANTIALIAS)