无法在matplotlib中保存动画：Windows权限被拒绝 [英] Cannot save animation in matplotlib: Windows permission denied
问题描述
我一直在尝试一整天，检查类似的线程，但没有成功。
拉伸无法保存matplotlib动画与ffmpeg 帮助以前的错误（我有ffmpeg路径错误），但我一直在访问被拒绝后修复它。
I've been trying for a day long to sort this out, checking similar threads but with no success. Stretch's Cannot save matplotlib animation with ffmpeg helped with previous errors (I had ffmpeg path wrong), but I kept getting Access denied after fixing it.
我的ffmpeg二进制文件位于 C：\ffmpeg\bin
My ffmpeg binary is on C:\ffmpeg\bin
一个不错的选择是能够导出gif文件，但我不断得到一个ascii错误与imagemagick。我认为这两个问题都是相关的，所以我想首先整理ffmpeg。
A nice alternative would be to able to export gif files, but I keep getting an ascii error with imagemagick. I think both problems are related, so I wanted to sort out the ffmpeg first.
我认为这个问题可能与我正在使用Canopy的事实有关在Windows 8 64位），这几乎是我的路径变量的霸权，并打破了一些事情（例如，我不能打开IDLE，因为我安装了Canopy，没有试图修复）。当我修复的东西，我发现至少3个不同的路径变量，所有这些我更新：Windows高级设置路径（手动设置），Windows控制台路径（通过控制台设置setx）和sys.path（设置或检查在运行时），添加; C：\ffmpeg\bin，其中ffmpeg有效。无论我是否解决问题，我想了解哪些环境变量与哪些相关，我觉得很困惑。
I think the problem might have to do with the fact I'm working with Canopy (in Windows 8 64bit), which pretty much hegemonized my path variable and broke some things along the way (e.g. I can't open IDLE since I installed Canopy, didn't tried to fix that yet). As I fixed things along the way I found at least 3 distinct path variables, all of which I updated: windows advanced settings path (set manually), windows console path (set via console with setx), and sys.path (set or checked at runtime), adding ";C:\ffmpeg\bin", where ffmpeg effectively is. Regardless I sort out the problem or not, I would like to learn which of these environment variables are relevant for what, I find it very confusing.
代码如下：
# -*- coding: utf-8 -*-
import sys
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
plt.rcParams['animation.ffmpeg_path'] = r'C:\ffmpeg\bin'
if r'C:\ffmpeg\bin' not in sys.path: sys.path.append(r'C:\ffmpeg\bin')
fig = plt.figure()
ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
line, = ax.plot([], [], lw=2)
def init():
line.set_data([], [])
return line,
def animate(i):
x = np.linspace(0, 2, 1000)
y = np.sin(2 * np.pi * (x - 0.01 * i))
line.set_data(x, y)
return line,
anim = animation.FuncAnimation(fig, animate, init_func=init, frames=200, interval=20, blit=True)
plt.show()
# This case generates Windows err: Access Denied
FFwriter = animation.FFMpegWriter()
# anim.save(r'C:\basic_animation.mp4', writer = FFwriter, fps=30)
# This case generates UnicodeDecodeError:'ascii' codec can't decode byte 0xa0 in position 3
# anim.save(r'C:\animation.gif', writer='imagemagick', fps=30)
anim.save（r'C：\basic_animation.mp4'，writer = FFwriter，fps = 30）的追溯：
%run "C:\Users\Yahveh\Documents\Vlad\Investigacion\animation saving.py"
---------------------------------------------------------------------------
WindowsError Traceback (most recent call last)
C:\Users\Yahveh\Documents\Vlad\Investigacion\animation saving.py in <module>()
27 # This case generates Windows err: Access Denied
28 FFwriter = animation.FFMpegWriter()
---> 29 anim.save(r'C:\basic_animation.mp4', writer = FFwriter, fps=30)
30
31 # This case generates UnicodeDecodeError:'ascii' codec can't decode byte 0xa0 in position 3
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\animation.pyc in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs)
759 # since GUI widgets are gone. Either need to remove extra code to
760 # allow for this non-existant use case or find a way to make it work.
--> 761 with writer.saving(self._fig, filename, dpi):
762 for data in zip(*[a.new_saved_frame_seq()
763 for a in all_anim]):
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.5.2.2785.win-x86_64\lib\contextlib.pyc in __enter__(self)
15 def __enter__(self):
16 try:
---> 17 return self.gen.next()
18 except StopIteration:
19 raise RuntimeError("generator didn't yield")
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\animation.pyc in saving(self, *args)
184 '''
185 # This particular sequence is what contextlib.contextmanager wants
--> 186 self.setup(*args)
187 yield
188 self.finish()
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\animation.pyc in setup(self, fig, outfile, dpi, *args)
174 # Run here so that grab_frame() can write the data to a pipe. This
175 # eliminates the need for temp files.
--> 176 self._run()
177
178 @contextlib.contextmanager
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\animation.pyc in _run(self)
202 stdout=output, stderr=output,
203 stdin=subprocess.PIPE,
--> 204 creationflags=subprocess_creation_flags)
205
206 def finish(self):
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.5.2.2785.win-x86_64\lib\subprocess.pyc in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags)
707 p2cread, p2cwrite,
708 c2pread, c2pwrite,
--> 709 errread, errwrite)
710 except Exception:
711 # Preserve original exception in case os.close raises.
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.5.2.2785.win-x86_64\lib\subprocess.pyc in _execute_child(self, args, executable, preexec_fn, close_fds, cwd, env, universal_newlines, startupinfo, creationflags, shell, to_close, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite)
955 env,
956 cwd,
--> 957 startupinfo)
958 except pywintypes.error, e:
959 # Translate pywintypes.error to WindowsError, which is
WindowsError: [Error 5] Acceso denegado
anim.save的追溯（r'C：\animation.gif'，作者='imagemagick'，fps = 30）：
In [8]: %run "C:\Users\Yahveh\Documents\Vlad\Investigacion\animation saving.py"
---------------------------------------------------------------------------
UnicodeDecodeError Traceback (most recent call last)
C:\Users\Yahveh\Documents\Vlad\Investigacion\animation saving.py in <module>()
30
31 # This case generates UnicodeDecodeError:'ascii' codec can't decode byte 0xa0 in position 3
---> 32 anim.save(r'C:\animation.gif', writer='imagemagick', fps=30)
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\animation.pyc in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs)
765 # TODO: Need to see if turning off blit is really necessary
766 anim._draw_next_frame(d, blit=False)
--> 767 writer.grab_frame(**savefig_kwargs)
768
769 # Reconnect signal for first draw if necessary
C:\Users\Yahveh\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\animation.pyc in grab_frame(self, **savefig_kwargs)
225 verbose.report('MovieWriter -- Error '
226 'running proc:\n%s\n%s' % (out,
--> 227 err), level='helpful')
228 raise
229
UnicodeDecodeError: 'ascii' codec can't decode byte 0xa0 in position 3: ordinal not in range(128)
盯着他们一段时间。
感谢您的时间！
更新：我按照这篇文章授予访问C：\ffmpeg和目标文件夹，但没有运气：（
UPDATE: I followed the steps in this post for granting access to both C:\ffmpeg and destination folder, but no luck :(
推荐答案
也许不是一个惊喜我的路径为ffmpeg， C：\ffmpeg\bin ，错了;因为它应该是直到exe文件的路径，而不仅仅是父文件夹，因为我从Stretch的帖子中被误解，就像Daniel指出的那样。
注意我以前已经尝试过，但是刚刚更改了当时的错误消息。
平静，休息一下，仔细阅读，不仅仅是寻找适合你的代码。这只是一个错误。
这是答案。
Perhaps not a surprise. My path to ffmpeg, C:\ffmpeg\bin, was wrong; since it should be the path right down to the exe file, not just the parent folder, as I misunderstood from Stretch's post, and as Daniel pointed out.
Notice out I have already tried this before, but just changed the error message at the time.
Calm, get some rest and read carefully, not just looking for the piece of code that will suit you. It's just a bug.
That's the answer.
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