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• How can I get my saved mp4 to exactly match the output of plot.show() ?

  10 mai 2019, par Jimmy

  When I try to save the results of an animation to mp4 using ffmpeg, I am getting a jumbled mess.

  plt.show() shows exactly what I want it to show in the animation. However, when I save it using ffmpeg, the result is very different from what plt.show() returns. I have tried various arguments for fps etc. but nothing has helped.

  %matplotlib
  
  import pandas as pd
  
  import matplotlib as mpl ## uncomment this if you are running this on a Mac
  
  #mpl.use('TkAgg')         ## and want to use blit=True
  
  import matplotlib.pyplot as plt 
  
  import matplotlib.animation as animation 
  
  import numpy as np 
  
  import csv
  
  
  
  people = ('','Jim', 'Dan')
  
  plt.rcdefaults()
  
  fig, ax = plt.subplots()
  
  y_pos = np.arange(len(people))
  
  
  
  ax.set_xlim(0,10)
  
  ax.set_yticks(y_pos)
  
  ax.set_yticklabels(people)
  
  ax.invert_yaxis() 
  
  ax.set_xlabel('Skill')
  
  titleList=['Basketball','Hockey','Baseball']
  
  df=[[0,5,7],[0,4,9],[0,2,6]]
  
  def animate(i):
  
     # Example data
  
      while i<3:
  
          ax.set_yticks(y_pos)
  
          ax.set_yticklabels(people)
  
          ax.set_xlabel(titleList[i])
  
          performance=df[i]
  
  
  
          title = ax.text(0.5,0.95,str(titleList[i]), bbox={'facecolor':'w', 'alpha':0.5, 'pad':5},transform=ax.transAxes, ha="center")
  
  
  
          rects = ax.barh(y_pos, performance, align='center',
  
                  color='blue', ecolor='None')
  
          return [rect for rect in rects] + [title]
  
  
  
  
  
  ani = animation.FuncAnimation(fig,animate, frames=3, blit=True
  
                              ,interval=2000,repeat=False)
  
  
  
  plt.rcParams['animation.ffmpeg_path'] = 'C:\\ffmpeg\\bin\\ffmpeg.exe'
  
  Writer = animation.writers['ffmpeg']
  
  ani.save('test.mp4')
  
  plt.show() 

  The result is a very fast video where all the data gets written over (similar to the plt.show() results when blit=False).

• List Directory of files to text file sorted by creation date but don't show creation creation date in file

  25 mars 2019, par Oli Shingfield

  I’ve been doing some research on this problem but I can’t get my head around it to suit my particular issue.

  I would like to create a text file of a list of files in a directory, sorted by date but I don’t want the date to be shown in the file.
  The code I have so far is :

  #create list of clips to merge
  
  save_path = 'downloads/'
  
  ignored = 'test.bat','mergeclips.bat','draw.bat'
  
  onlyfiles = [f for f in listdir('downloads/') if isfile(join('downloads/', f)) if f not in ignored]
  
  
  
  with open('downloads/clipstomerge.txt', 'w') as f:
  
      for item in onlyfiles:
  
          f.write("file '%s'\n" % item )

  This code ignores the bat files but lists everything else out to a text file in a format ready for ffmpeg to merge the clips. The format of the text file looks like this :

  file 'ARandomClipName.mov'
  
  file 'Butterflies.mov'
  
  file 'Chickens.mov'

  At the moment the files are sorted alphabetically but I would like it to be sorted by creation date.
  Does anyone have any ideas how I could modify my code to fix my problem ?

• Show Filename in Video ffmpeg batch script

  19 mars 2019, par Oli Shingfield

  I have a folder with around 10 different mov files. I would like to add the filename as text on each of the videos using ffmpeg in a bat file. Could someone help me achieve this please ?

  EDIT :

  I have tried using

  @ECHO OFF&Setlocal EnableDelayedExpansion
  
  Set INPUT=E:\\Users\\Oli\\Documents\\Projects\\v1.3.0\\downloads3
  
  Set OUTPUT=E:\\Users\\Oli\\Documents\\Projects\\v1.3.0\\downloads3
  
  for %%a in ("%INPUT%\*.*") DO ( 
  
      set "filename=%%~na"
  
      ffmpeg -i "%%a" -vf "drawtext=text=!fileName:.= !:x=105:y=120:fontfile=E:\\Users\\Oli\\Documents\\Projects\\v1.3.0\\downloads3\\impact.ttf:fontsize=25:fontcolor=white" -b:v 1M -r 60 -b:a 320k -ar 48000 -crf 17 "%%~na.mov"
  
  )`

  But it gives me the error :

   Cannot find a valid font for the family Sans
  
  [AVFilterGraph @ 0000026eb75a9f40] Error initializing filter 'drawtext' with args 'text=FileName1'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: No such file or directory
  
  Error while processing the decoded data for stream #0:0