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• How to add text to video with ffmpeg without vhook ?

  15 juillet 2013, par motto

  I think question is simple enough. How to add text with ffmpeg vhook is deprecated and i couldn't find any easier solution.

  Using ubuntu and installed latest ffmpeg version.

• Ffmpeg and OpenCv versions incompatibility

  28 juillet 2017, par Agustin Jacob Ortiz Mendez

  I installed Python 2.7.5 and OpenCV 2.4. I’m trying to follow the instructions of this page
  http://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_gui/py_video_display/py_video_display.html
  And it suggest to install the proper version of Ffmpeg. I installed it following the instructions of this page
  http://adaptivesamples.com/how-to-install-ffmpeg-on-windows/
  Which tells the user how to add Ffmpeg to the environment variables.
  However, the sample code doesn’t work. And I don’t know if it is because the versions of OpenCv and ffmpeg are incompatible with one another.
  I’ll leave the sample code here.
  Thanks for reading :D

  import numpy as np import cv2
  
  
  
  cap = cv2.VideoCapture('vtest.avi')
  
  
  
  while(cap.isOpened()):
  
      ret, frame = cap.read()
  
  
  
      gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
  
  
      cv2.imshow('frame',gray)
  
      if cv2.waitKey(1) & 0xFF == ord('q'):
  
          break
  
  
  
  cap.release() cv2.destroyAllWindows()

• ffmpeg continuous live streaming of dynamic files from directory

  4 septembre 2022, par user72261

  So I have been using ffmpeg to create a live stream from files stored in a folder using concat list.

  


  This works perfectly for local, static content but I have a security system in my warehouse that uploads .mp4 files to my server in the office.

  


  This system doesn't have any live stream functionality so I would like to set up a live stream myself using ffmpeg to continually read the latest files from the folder.

  


  I tried setting up a script to read all files in the directory and sort them based on the file name that is a UNIX timestamp of the date/time the video was taken. Then had the script select the latest segments after that last used segment and create a new concat list such as below

  


  file '00000.mpd'
file '00001.mp4'
file '00002.mp4'
file '00003.mp4'
file '00004.mp4'


  


  After doing some reading I found out to make it loop that file you could reference its self in the list like so

  


  file '00000.mpd'
file '00001.mp4'
file '00002.mp4'
file '00003.mp4'
file '00004.mp4'
file 'concat.txt'


  


  This seemed to work ok until I started getting the error impossible to open concat.txt. This file doesn't exist, which I can only guess is because ffmpeg is trying to open the file as its being updated by the script.

  


  Has anyone come across this before or know another way to do it ?