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• Matplotlib : ValueError : I/O operation on closed file [duplicate]

  28 septembre 2017, par gopi

  This question is an exact duplicate of :

  • animation.FuncAnimation ValueError : I/O operation on closed file

  %matplotlib inline
  
  import math,os,sys,numpy as np
  
  from numpy.random import random
  
  from matplotlib import pyplot as plt, rcParams, animation, rc
  
  from __future__ import print_function, division
  
  from ipywidgets import interact, interactive, fixed 
  
  from ipywidgets.widgets import *
  
  rc('animation', html='html5')
  
  rcParams['figure.figsize'] = 3,3
  
  %precision 4
  
  np.set_printoptions(precision=4, linewidth=100)
  
  
  
  def lin(a,x,b): return a * x + b
  
  
  
  a = 3.
  
  b = 8.
  
  n = 30
  
  
  
  x = random(n)
  
  y = lin(a,x,b)
  
  
  
  plt.scatter(x,y)
  
  
  
  def sse(y, y_pred): return ((y-y_pred)**2).sum()
  
  def loss(y, a, x, b): return sse(y, lin(a, x, b))
  
  def avg_loss(y, a, x, b): return np.sqrt(loss(y, a, x, b)/n)
  
  
  
  a_guess = -1
  
  b_guess = 1
  
  avg_loss(y, a_guess, x, b_guess)
  
  
  
  lr = 0.01
  
  #d[(y-(a*x+b))**2, b] = 2 (y_pred - y)
  
  #d[(y -(a*x+b)) **2, a] = x * dy/db
  
  
  
  def upd():
  
      global a_guess, b_guess
  
      y_pred = lin(a_guess, x, b_guess)
  
      dydb = 2 * (y_pred - y)
  
      dyda = x * dydb
  
      a_guess -= lr*dyda.mean()
  
      b_guess -= lr*dydb.mean()
  
  
  
  
  
  fig = plt.figure(dpi=100, figsize=(5,5))
  
  plt.scatter(x,y)
  
  line, = plt.plot(x, lin(a_guess, x, b_guess))
  
  plt.close()
  
  
  
  def animate(i):
  
      line.set_ydata(lin(a_guess, x, b_guess))
  
      for i in range(10): upd()
  
      return line,
  
  
  
  
  
  ani = animation.FuncAnimation(fig, animate, np.arange(0, 40), interval=100)
  
  ani

  But when I run it I get the following error,

      ValueError Traceback (most recent call last)
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/IPython/core/formatters.pyc in __call__(self, obj)
  
      309             method = get_real_method(obj, self.print_method)
  
      310             if method is not None:
  
  --> 311                 return method()
  
      312             return None
  
      313         else:
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/matplotlib/animation.pyc in _repr_html_(self)
  
     1233         fmt = rcParams['animation.html']
  
     1234         if fmt == 'html5':
  
  -> 1235             return self.to_html5_video()
  
     1236 
  
     1237 
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/matplotlib/animation.pyc in to_html5_video(self)
  
     1207                                 bitrate=rcParams['animation.bitrate'],
  
     1208                                 fps=1000. / self._interval)
  
  -> 1209                 self.save(f.name, writer=writer)
  
     1210 
  
     1211             # Now open and base64 encode
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/matplotlib/animation.pyc in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs)
  
     1061                         # TODO: See if turning off blit is really necessary
  
     1062                         anim._draw_next_frame(d, blit=False)
  
  -> 1063                     writer.grab_frame(**savefig_kwargs)
  
     1064 
  
     1065         # Reconnect signal for first draw if necessary
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/contextlib.pyc in __exit__(self, type, value, traceback)
  
       33                 value = type()
  
       34             try:
  
  ---> 35                 self.gen.throw(type, value, traceback)
  
       36                 raise RuntimeError("generator didn't stop after throw()")
  
       37             except StopIteration, exc:
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/matplotlib/animation.pyc in saving(self, *args, **kw)
  
      287             yield self
  
      288         finally:
  
  --> 289             self.finish()
  
      290 
  
      291     def _run(self):
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/matplotlib/animation.pyc in finish(self)
  
      307     def finish(self):
  
      308         'Finish any processing for writing the movie.'
  
  --> 309         self.cleanup()
  
      310 
  
      311     def grab_frame(self, **savefig_kwargs):
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/matplotlib/animation.pyc in cleanup(self)
  
      346     def cleanup(self):
  
      347         'Clean-up and collect the process used to write the movie file.'
  
  --> 348         out, err = self._proc.communicate()
  
      349         self._frame_sink().close()
  
      350         verbose.report('MovieWriter -- '
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/subprocess32.pyc in communicate(self, input, timeout)
  
      925 
  
      926         try:
  
  --> 927             stdout, stderr = self._communicate(input, endtime, timeout)
  
      928         finally:
  
      929             self._communication_started = True
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/subprocess32.pyc in _communicate(self, input, endtime, orig_timeout)
  
     1711             if _has_poll:
  
     1712                 stdout, stderr = self._communicate_with_poll(input, endtime,
  
  -> 1713                                                              orig_timeout)
  
     1714             else:
  
     1715                 stdout, stderr = self._communicate_with_select(input, endtime,
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/subprocess32.pyc in _communicate_with_poll(self, input, endtime, orig_timeout)
  
     1767             select_POLLIN_POLLPRI = select.POLLIN | select.POLLPRI
  
     1768             if self.stdout:
  
  -> 1769                 register_and_append(self.stdout, select_POLLIN_POLLPRI)
  
     1770                 stdout = self._fd2output[self.stdout.fileno()]
  
     1771             if self.stderr:
  
  
  
  /home/gopinath/Workspace/anaconda3/envs/py27/lib/python2.7/site-packages/subprocess32.pyc in register_and_append(file_obj, eventmask)
  
     1746             poller = select.poll()
  
     1747             def register_and_append(file_obj, eventmask):
  
  -> 1748                 poller.register(file_obj.fileno(), eventmask)
  
     1749                 self._fd2file[file_obj.fileno()] = file_obj
  
     1750 
  
  
  
  ValueError: I/O operation on closed file

  I almost tried everywhere and I couldn’t find a solution, I tried reinstalling ffmpeg from the sources, moved this file to the folder where I installed ffmpeg and gave a try.

  I’m using python 3.5,
  Ubuntu 16.04
  Anaconda 4.4
  Matplotlib 2.02

  actually this particular course was taught using python 2.7 so I created a virenv installed 2.7 along with all related dependencies. So will it be the problem ?? I mean using python 2.7 on top of 3.5 ?

• Problems with slowing down when grid synthesis operation request via ffmpeg is received simultaneously

  7 novembre 2022, par bongcheol Kim
  

  1. Crop/scaling/volume leveling encoding of videos uploaded by users in S3 with predetermined settings

  


  2. Synthesize in grid form with other pre-prepared videos.

  


  


  Perform the above tasks through ffmpeg.
Encoding slows down when multiple requests occur simultaneously.
(Maybe it's because we shared the server's resources.)

  


  To process task requests from 1 and 2 at the same time, but to process them
What can I do ?

  


  Is there a service on AWS that can solve my problems ?

  


  I thought about creating and processing ec2 individually for each request, but is this possible ?

  


  

  1. Invoke API

  


  2. Create EC2

  


  3. Proceed with one encoding operation on the corresponding EC2

  


  4. Delete EC2 after uploading s3

  


  


• avcodec/rkmpp : Fix broken build due to missing control operation

  6 janvier 2018, par LongChair

  avcodec/rkmpp : Fix broken build due to missing control operation
  This patch is taking care of https://trac.ffmpeg.org/ticket/6834.
  
  It seems that one of the control operations that was available to get
  
  the free decoders input slots was removed.
  There is another control operation to retrieve the used slots. Given
  
  that the input slot count is hardcoded to 4 in mpp at this point,
  
  replacing the old control operation by the other one.
  This was tested on Rockchip ROCK64.
  Signed-off-by : wm4 <nfxjfg@googlemail.com>
  

  • [DH] configure
  • [DH] libavcodec/rkmppdec.c