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• ffmpeg : How to save SSIM and PSNR to a file ?

  7 mars 2021, par idoo

  I'm a ffmpeg newbie.
I would like my script (on Windows) to output the average PSNR and average SSIM values to a file.
(but not the values for every frame)
I can output them to the standard output but not to a file.

  


  I use this line :

  


  ffmpeg -i ref.avi -i compressed.avi -lavfi  "ssim;[0:v][1:v]psnr" -f null -


  


  I understand I have to change something here : "-f null -" , but I cannot make it work.

  


• How to Save an Image (Current Frame) from an RTSP, using FFMPEG ?

  4 mars 2023, par spaceman

  I recently purchased a Security Camera,
  
and it provides an RTSP URL withwhich you can view the video.

  


  So If I run the command VLC rtsp://<ip>/etc</ip> for example,
  
then I am successfully able to watch the stream from the camera.

  


  My question is :
  
Does FFMPEG provide some command line operation for Saving one Image from an RTSP Stream to disk ?

  


  That way I can run this command, and have a .PNG or .JPG file created on disk.

  


• try to generate a frame from a video using FFmpeg command and try to save all frame in a upload directory

  15 juillet 2022, par Rahul singh

  import ffmpeg

import os

for video in os.listdir(video_path):

     if video.endswith(".mp4"):

          if not os.path.exists('upload'):

                 os.makedirs('upload')
                 os.chdir('upload')
                 print(os.getcwd())
                 command = f'ffmpeg -i {video} frame_%0d.jpg'
                 os.system(command)


  


  i am trying to generate frame using ffmpeg command and save frame in upload directory but not able to do it. can anyone help me with this. It will be great help. Thanks in advance.