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• Generating videos with cv2 not working on ubuntu server

  1er mars 2023, par Cosmo

  I'm trying to generate a video from a series of jpg on an aws ubuntu instance. The video generation goes fine but when I download the video and try to play it I get this error from windows :

  


  We can't open output.mp4. This may be because the file type is unsupported, the file extension is incorrect or the file is
corrupt.
0xC00D36C4


  


  When I run the code on my windows machine I don't get the error and the video plays fine (code below) :

  


  import cv2
import os

path = 'out_frames/'
out_video_name = 'output.avi'

pre_imgs = os.listdir(path)
# print(pre_imgs)
img = []

for i in pre_imgs:
    i = path+i
    # print(i)
    img.append(i)


size = (1000,1000)
# print(size)

video = cv2.VideoWriter('output.mp4', cv2.VideoWriter_fourcc(*'mp4v'), 24, size) #output video name, fourcc, fps, size

for i in range(len(img)):
    video.write(cv2.imread(img[i]))
    print('frame ', i+1, ' of ', len(img))

video.release()
print('Video made! Return to previous page to download')



  


  I've tried :

  


  

  • Using different encoders

  


  • reinstalling opencv - sudo pip install opencv-contrib-python

  


  • reinstalling ffmpeg - sudo apt-get install ffmpeg

  


  • installing these libraries - sudo apt-get install libx264-dev sudo apt-get install libx265-dev libnuma-dev

  


  • experimented outputting .avi's instead of .mp4's

  


  


  Edit :
This doesn't solve my problem but may help understanding it. I tried converting the 'broken' mp4's to an avi using a website and windows is able to play this avi with 1 caveat being the video is choppy (almost like the frames are missorderd ?)
note - when I generate the video files using the code on windows there's no choppy effect.

  


  I'm at a loss.
Thanks in advance :)

  


• matplotlib animation ArtistAnimation failure due to ffmpeg unavailable

  23 octobre 2017, par Ohm

  I am trying to call matplotlib.animation.ArtistAnimation to make an animation from a series of png images, but I get an error that is connected to the ffmpeg. I have Anaconda installed on my Ubuntu 14.04. The error message that I get is :

  UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
  
    warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
  
  /home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py:782: UserWarning: MovieWriter ffmpeg unavailable
  
    warnings.warn("MovieWriter %s unavailable" % writer)
  
  ...
  
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 810, in save
  
      writer.grab_frame(**savefig_kwargs)
  
    File "/home/ohm/anaconda2/lib/python2.7/contextlib.py", line 24, in __exit__
  
      self.gen.next()
  
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 196, in saving
  
      self.finish()
  
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 389, in finish
  
      + ' Try running with --verbose-debug')
  
  RuntimeError: Error creating movie, return code: 1 Try running with --verbose-debug

  I’ve tried sudo apt-get install ffmpeg, but there is no such package. Someone knows what package I’m missing ?

• matplotlib animation ArtistAnimation failure due to ffmpeg unavailable

  18 juin 2016, par Ohm

  I am trying to call matplotlib.animation.ArtistAnimation to make an animation from a series of png images, but I get an error that is connected to the ffmpeg. I have Anaconda installed on my Ubuntu 14.04. The error message that I get is :

  UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
  
    warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
  
  /home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py:782: UserWarning: MovieWriter ffmpeg unavailable
  
    warnings.warn("MovieWriter %s unavailable" % writer)
  
  ...
  
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 810, in save
  
      writer.grab_frame(**savefig_kwargs)
  
    File "/home/ohm/anaconda2/lib/python2.7/contextlib.py", line 24, in __exit__
  
      self.gen.next()
  
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 196, in saving
  
      self.finish()
  
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 389, in finish
  
      + ' Try running with --verbose-debug')
  
  RuntimeError: Error creating movie, return code: 1 Try running with --verbose-debug

  I’ve tried sudo apt-get install ffmpeg, but there is no such package. Someone knows what package I’m missing ?