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• ffmpeg-python outputs black screen when trying to save as mp4

  3 mars 2023, par Saya

  This is my code. I am trying to make a video out of all pictures in the pics2 directory using ffmpeg.

  


  import subprocess

command = 'ffmpeg -framerate 1 -i "pics2/Image%02d.png" -r 1 -vcodec libx264 -s 1280x720 -pix_fmt yuv420p Output.mp4'
p = subprocess.call(command, shell=True)


  


  This saves an Output.mp4 successfully but the video has no frames (It is completely black)

  


  How do I solve this ?

  


• Revision 866447a008 : webmdec : Fix for reaching eof in webm_guess_framerate Reset the reached_eos fla

  4 avril 2015, par Vignesh Venkatasubramanian

  Changed Paths :
   Modify /test/tools_common.sh

  
   Modify /test/vpxdec.sh

  
   Modify /webmdec.cc

  
  
  webmdec : Fix for reaching eof in webm_guess_framerate

  Reset the reached_eos flag in webm_guess_framerate in case it ends
  up consuming the entire file. Also adding a vpxdec shell test to
  verify this behavior.

  Change-Id : I371eebd2105231dc0f60e65da1f71b233ad14be5

• 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.