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/
我尝试了以下方法,非常有用:
首先下载Figtodat和images2gif库到本地目录。
其次,收集数组中的图形并将其转换为动画gif:
import sys
sys.path.insert(0,"/path/to/your/local/directory")
import Figtodat
from images2gif import writeGif
import matplotlib.pyplot as plt
import numpy
figure = plt.figure()
plot = figure.add_subplot (111)
plot.hold(False)
# draw a cardinal sine plot
images=[]
y = numpy.random.randn(100,5)
for i in range(y.shape[1]):
plot.plot (numpy.sin(y[:,i]))
plot.set_ylim(-3.0,3)
plot.text(90,-2.5,str(i))
im = Figtodat.fig2img(figure)
images.append(im)
writeGif("images.gif",images,duration=0.3,dither=0)
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()
下面是如何使用PIL (install with: pip install Pillow):
import glob
import contextlib
from PIL import Image
# filepaths
fp_in = "/path/to/image_*.png"
fp_out = "/path/to/image.gif"
# use exit stack to automatically close opened images
with contextlib.ExitStack() as stack:
# lazily load images
imgs = (stack.enter_context(Image.open(f))
for f in sorted(glob.glob(fp_in)))
# extract first image from iterator
img = next(imgs)
# https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#gif
img.save(fp=fp_out, format='GIF', append_images=imgs,
save_all=True, duration=200, loop=0)
查看文档:https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#gif
from PIL import Image
import glob #use it if you want to read all of the certain file type in the directory
imgs=[]
for i in range(596,691):
imgs.append("snap"+str(i)+'.png')
print("scanned the image identified with",i)
标识不同文件名的索引的起始值和结束值+1
imgs = glob.glob("*.png") #do this if you want to read all files ending with .png
我的文件是:snap596.png, snap597.png ......snap690.png
frames = []
for i in imgs:
new_frame = Image.open(i)
frames.append(new_frame)
保存到一个GIF文件,永远循环
frames[0].save('fire3_PIL.gif', format='GIF',
append_images=frames[1:],
save_all=True,
duration=300, loop=0)
我发现闪烁的问题与imageio和这个方法固定。