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• Python : How to use ffmpeg to read videos(video file or rtsp) and display them using OpenCV ?

  22 août 2019, par ToughMind

  I know that if we want to read video file or USB camera or rtsp stream, we can use cv2.VideoCapture.
  But for some reason, I want to use ffmpeg to do the thing and process obtained images using opencv. So the pseudocode would be :

  import cv2
  
  import ffmpeg
  
  
  
  videoFile = 'XXX.mp4'
  
  
  
  video = ffmpeg.XXX(videoFile)
  
  
  
  while True:
  
      frame = video.read() # this read() function is made up by me
  
      frameCV = ffmpeg2cv(frame) # this ffmpeg2cv() function is made up by me
  
  
  
      cv2.imshow('frame', frameCV)

  I have searched a something like https://github.com/kkroening/ffmpeg-python. But I still not know how to do this. I think ffmpeg is too hard and there are few online docs unlike opencv. So please help.

• How to change ffmpeg -threads settings [migrated]

  5 août 2014, par Jacob

  Working on a tube site. I’m running videos through ffmpeg on a linux dedicated server to convert to mp4.

  The server specs :

  Architecture:          x86_64
  
  CPU op-mode(s):        32-bit, 64-bit
  
  Byte Order:            Little Endian
  
  CPU(s):                8
  
  On-line CPU(s) list:   0-7
  
  Thread(s) per core:    2
  
  Core(s) per socket:    4
  
  Socket(s):             1
  
  NUMA node(s):          1
  
  Vendor ID:             GenuineIntel
  
  CPU family:            6
  
  Model:                 60
  
  Stepping:              3
  
  CPU MHz:               3491.749
  
  BogoMIPS:              6983.49
  
  Virtualization:        VT-x
  
  L1d cache:             32K
  
  L1i cache:             32K
  
  L2 cache:              256K
  
  L3 cache:              8192K
  
  NUMA node0 CPU(s):     0-7

  Issue during testing is that even only doing 4-5 at once, the server load skyrockets to an average of around 36. This is just a single person. I imagine when it opens, many people will be uploading at once.

  It seems ffmpeg tries to use all the resources available per conversion.

  I’ve heard there’s a -threads setting you can change, but I cannot find it. I have an 8 cpu server. It’s only used for conversions, so I’ve heard the best setting would be between 2 and 4. I can test it out.

  But how do I change this setting ? Everything I see online discusses this setting, but not the steps to change it.

• FFMPEG not converting or sending new video to folder

  7 mars 2016, par David Draw

  So recently I wanted to work on converting any video file that isn’t a MP4 file to that very file type. I did a lot of browsing and FFMPEG was the solution.
  I tried using FFMPEG_php on my wamp server but seems it is outdated and is no longer updated
  So I downloaded the static package off the FFMPEG website and put it into my C : drive and put the path to it in my computer, following some videos and tutorials online to do so.

  I believe calling it from the php file with a path is what I have to do as there is so much conflicting information on this which isn’t clear.

  So I’m on windows 7 build 7601
  I use wamp server 2.5 with the Highest PHP, MYSQL and APACHE.

  I added the below code into my php script after the file is moved to the first folder as by a few tutorials I’ve read. But the uploaded file is not converting nor is being put in the destination_mp4 folder.

  Any help would be greatly appreciated. Thank you.

     if(move_uploaded_file($file_loc,$folder.$final_file))
  
      {
  
  
  
      exec("C:/ffmpeg/bin/ffmpeg.exe  -i ".$folder.$final_file." ".   $destination_mp4."");
  
      $newName = $_SERVER['REMOTE_ADDR'].'_'.$_SESSION['id'].''.time();
  
      $mp4Name=$newName.'.mp4';
  
      $destination_mp4='C:/wamp/www/include/uploadvideomp4/'.$mp4Name;