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• FFMPEG output to the Exact Folder using Python

  6 août 2021, par Ande Caleb

  i'm working on a simple script using ffmpeg, to reduce the size of a video and add watermark to the video, then move the final output into the compressed folder... this is my script.

  


  the compression works, the watermark works, but the issue i'm having is that the final output is placed in the root folder, and not in the compressed folder... below i my folder structure and my scripts

  


  Folder Structure

  


     rootfolder
    |
    |--media
       |--vids
          |--(video files, mov, mp4s)..
       |--compressed
    |--encode.py


  


  Script (encode.py) file

  


  import os    
import subprocess
from pathlib import Path


dir_path = os.path.dirname(os.path.realpath(__file__))    
vidfile = dir_path + '/media/vids/mv1.mov'    
watermark = dir_path + '/media/watermark.png'
compressed = str(Path.cwd() / '/media/compressed/')

# 1. compress the video and store it in the media out folder

media_out = str(dir_path + "/compressed_mv1s.mov").replace(" ", "\\ ") 
subprocess.run("ffmpeg -i " + vidfile.replace(" ", "\\ ") +
               " -vcodec libx264 -crf 22 " + media_out, shell=True)  

#2.add watermark to the video and move it to the compressed folder 

media_watermarked = str(compressed + '/w_mv1.mov').replace(" ", "\\ ")
subprocess.run("ffmpeg -i " + media_out + " -i " + watermark +
               " -filter_complex \"overlay=main_w-(overlay_w+10) : main_h-(10+overlay_h)\" " + media_watermarked, shell=True)


  


  in summary, compressing the video works, adding watermark works, but the last line, the error is from the media_watermarked variable, i'm not sure what i'm doing wrong but it isn't resolving the folder correctly moving the final output to the folder.. this is the error i get

  


  

  


  Also, how can i run two ffmpeg commands concurrently to compress the video and add watermark at once without doing it seperately.
Thanks.

  


• How to avoid stopping or record all dynamic videos in the process of capturing screen video with ffmpeg from a python program ?

  3 décembre 2020, par fengnix

  I have many robotframework test cases and in the first case, a ffmpeg command like the following is invoked to record the whole running process :

  


  ffmpeg -framerate 30 -f gdigrab -i desktop -c:v libx264rgb -crf 0 -preset ultrafast output.mkv


  


  Whenever I firstly run all cases and then manuually run the above command from an addition command console, the recorded video always looks fine, it looks like all contents on the screen can be correctly captured.

  


  However, once I execute the command the same as the above one in the first case by call the following code :

  


  p=subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)


  


  and then in the final test case the record process is stopped by calling the following code to tell ffmpeg that we want to stop the recording :

  


  p.stdin.write(bytes("q",'UTF-8'))  


  


  the final result video only contain correct contents of the "start" and the "end" of the whole process, but all other contents no longer changed and seemd just a static image, which means all the dynamic effects on the screen cannot be captured.

  


  Could anyone be so kind as to let me know what the matter is and how to solve it ?

  


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