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• how to put image files from one folder to make a video in python

  23 septembre 2015, par Gaurav16

  I have written a code to collect all image files from one folder, so that I can make a video out of it.

  But while compiling I getting an error saying "Error creating movie, return code: 4 Try running with --verbose-debug"

    #import numpy as np
  
  import matplotlib.pyplot as plt
  
  import matplotlib.animation as animation
  
  import glob, os
  
  from PIL import Image
  
  fig = plt.figure()
  
  #size = 128, 128
  
  ims=[]
  
  #print(len(ims))
  
  #im=Image.open(ims[5])
  
  #im.show()
  
  for infile in glob.glob("*.png"):
  
      file, ext = os.path.splitext(infile)
  
      im = Image.open(infile)
  
      im1=plt.imshow(im)
  
      ims.append([im1])
  
  print(len(ims))    
  
  ani = animation.ArtistAnimation(fig, ims)
  
  ani.save('MovWave.mpeg', writer="ffmpeg")
  
  plt.show()

• How to record a 5 second video on Raspberry Pi 3 with USB webcam ?

  16 mars 2023, par Feengineer

  Hi i tried to record a video whit a USB-webcam on my RaspberryPi.
When i type ffplay /dev/video0 I do see a live video, but when i try to record it with ffmpeg the video output is like a black screen with like the traffic cone in my VLC media player. I tried saving the video as a .mkv and .mp4 file. Anyone know how to fix this ?

  


  The code i used to record a video is : ffmpeg -f v4l2 -t 5 -framerate 25 -video_size 640x480 -i /dev/video0 output.mkv and ffmpeg -f v4l2 -t 5 -framerate 25 -video_size 640x480 -i /dev/video0 output.mp4
The video did show up in the folder, but it doesn't show video when opening.

  


  edit : I fixed it now by changing the file type to .avi, but if anyone can still explain how to get .mkv or .mp4, let me know :)

  


• Process Multiple Streams using ffmpeg-python

  27 novembre 2019, par C Dorman

  I have a MPEG-2 TS with a stream of video and a steam of KLV metadata. I can use ffmpeg-python to process each of these streams independently. For example, I can get the video stream, process each frames using numpy as shown in the docs. I can also get the data stream and show it in following way (using the library klvdata) :

  process = (
  
      ffmpeg
  
          .input(in_filename)
  
          .output('pipe:', format='data', codec='copy', map='data-re')
  
          .run_async(pipe_stdout=True, pipe_stderr=True)
  
  )
  
  
  
  for packet in klvdata.StreamParser(process.stdout.read()):
  
      packet.structure()
  
  
  
  process.wait()

  How do I do these at the same time ? I need to split the TS data into its streams and process them both, keeping them in sync. ffmpeg by itself can demultiplex the streams into separate files, but how do I handle the streams in python. The KLV has information that I want to show on top of the video stream (recognition boxes).