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• How to Extract frames and set frames per seconds with .sh file

  20 août 2022, par Fraction Analytics

  I am trying to extract features from videos using a shell script file while extracting features from videos I don't know how to set frames per second.

  


  #!/bin/bash
frames_folder_path=./data
videos_folder_path=./videos
ext=mp4

mkdir "${frames_folder_path}"

for video_file_path in "${videos_folder_path}"/*."${ext}"; do
    slash_and_video_file_name="${video_file_path:${#videos_folder_path}}"
    slash_and_video_file_name_without_extension="${slash_and_video_file_name%.${ext}}"
    video_frames_folder_path="${frames_folder_path}${slash_and_video_file_name_without_extension}";
    mkdir "${video_frames_folder_path}"
    ffmpeg -i "${video_file_path}" "${video_frames_folder_path}/%d.jpg"
done


  


  I tried this code to extract the feature. I just want to extract 2 frames per second but It removes 30 frames per second with default frames rate.

  


  How to resolve this issue with shell script file.

  


• How to catch the ffmpeg connection error on python

  6 janvier 2017, par user824624

  I am working on the ffmpeg with python.This works when the remote server is working well, however when the remote server is down, I could see the message on the shell saying
  ’Connection to tcp ://xxxxxxx failed : Connection refused, blabla’

  pro = sp.Popen(command, preexec_fn=os.setsid, shell=False, stderr=sp.PIPE, stdout=sp.PIPE)

  catch exception approach 1 :

  try:
  
     out = self.pro.stderr.readline()
  
     while out:
  
              print '......'
  
  except BrokenPipeError:
  
       print 'err'

  catch exception approach 2 :

  for line in self.pro.stderr:
  
      try:
  
          print line
  
      except BrokenPipeError:
  
          print 'error'

  However none of these works.

• Intermitent Connection Issues for FFMPEG Stream capture

  22 novembre 2014, par Quentin Spottiswoode

  I intend to create a Python shell script to open a connection to an MP3 stream and record the stream over a specified period and save the file to a .mp3 file for distribution. ffmpeg will likely be involved through a shell command, rather than using any kind of python wrapper class.

  Occasionally, the source of the stream may encounter connection issues with the internet, resulting in the listening client (ffmpeg) losing it’s connection with the host. Currently ffmpeg discards the recording entirely and forgets about attempting to reconnect to the host.

  having had a look through ffmpeg’s extensive documentation, I found myself very confused...

  • Is there some method to retain the recording up to the point of the connection failure ?
  • Is there a method of automatically re-connecting to the stream when the host reappears, or do I have to catch the error and try a certain number of times ?
  • Is there a method of passing the error to the python script in order to create a suitable response ?

  Many thanks for your insight :)