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/
当前回答
安装
pip install imageio-ffmpeg
pip install imageio
Code
import imageio
images = []
for filename in filenames:
images.append(imageio.imread(filename))
imageio.mimsave('movie.mp4', images)
当保存为mp4而不是gif时，质量提高，大小从8Mb减少到80Kb
其他回答
安装
pip install imageio-ffmpeg
pip install imageio
Code
import imageio
images = []
for filename in filenames:
images.append(imageio.imread(filename))
imageio.mimsave('movie.mp4', images)
当保存为mp4而不是gif时，质量提高，大小从8Mb减少到80Kb
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()
真是不可思议……所有人都提出了一些特殊的包来播放动画GIF，目前它可以用Tkinter和经典的PIL模块!
这是我自己的GIF动画方法(我之前创建的)。非常简单:
from Tkinter import *
from PIL import Image, ImageTk
from time import sleep
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 = float(im.info['duration'])/1000; # Delay used in the GIF file
lbl = Label(image=img); lbl.pack() # Create a label where to display images
play = True; frame = 0
while play:
sleep(delay);
frame += 1
try:
im.seek(frame); img = ImageTk.PhotoImage(im)
lbl.config(image=img); root.update() # Show the new frame/image
except EOFError:
frame = 0 # Restart
root.mainloop()
您可以设置自己的方法来停止动画。如果你想要完整版本的播放/暂停/退出按钮，请告诉我。
注意:我不确定连续帧是从内存还是从文件(磁盘)读取的。在第二种情况下，如果它们都一次读取并保存到一个数组(列表)中，那么效率会更高。(我没兴趣知道!：）
就像沃伦去年说的，这是一个老问题。由于人们似乎仍然在浏览页面，我想将他们重定向到一个更现代的解决方案。就像blakev说的，github上有一个枕头的例子。
import ImageSequence
import Image
import gifmaker
sequence = []
im = Image.open(....)
# im is your original image
frames = [frame.copy() for frame in ImageSequence.Iterator(im)]
# write GIF animation
fp = open("out.gif", "wb")
gifmaker.makedelta(fp, frames)
fp.close()
注意:这个例子已经过时了(gifmaker不是一个可导入的模块，只是一个脚本)。Pillow有一个GifImagePlugin(其源代码在GitHub上)，但ImageSequence上的文档似乎表明有限的支持(只读)
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
