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• how to merge audio and video file in python using ffmpeg ?

  5 août 2020, par arvind8

  I am trying to create a python script which merge the audio and video file in one (audio+video) file.

  


  And i am using ffmpeg to achieve this but it is not working and i am getting a errors.
while running this script here is my script.

  


  import os
import subprocess
import time
from datetime import datetime
def merge_all():
    
 global p
 p =subprocess.Popen('ffmpeg -i temp_vid.mp4 -i temp_voice.wav -c:v copy -c:a aac -strict experimental - 
 strftime 1 ' + dt_file_name ,stdin=subprocess.PIPE,creationflags = subprocess.CREATE_NO_WINDOW)
  time.sleep(2)
  print('merging done')
  os.remove('temp_vid.mp4')
  os.remove('temp_voice.wav')
  print('file delete done')>


  


  here is the error

  


  Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\kp\AppData\Local\Programs\Python\Python38\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)

  File "C:\Users\kp\Desktop\test.py", line 179, in change_icon
    merge_all()

  File "C:\Users\kp\Desktop\test.py", line 104, in merge_all
 
p =subprocess.Popen('ffmpeg -i temp_vid.mp4 -i temp_voice.wav -c:v copy -c:a aac -strict experimental -strftime 1 ' + dt_file_name ,stdin=subprocess.PIPE,creationflags = subprocess.CREATE_NO_WINDOW)

  File "C:\Users\kp\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,

  File "C:\Users\kp\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 1307, in _execute_child

hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified


  


• Produce an adaptive multi-resolution mpeg-dash file from an input video file

  1er mars 2021, par Tariq Hasan

  I can produce different resolution mpeg-dash videos from running these commands separately and get one .mpd file for each of the resolutions :

  


  ffmpeg -i /path/to/input.mp4 -vf scale=1920:1080 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=1280:720 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=720:480 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=640:360 /path/to/output.mpd


  


  The question is, how do I get a single .mpd file that maps to all these different resolution videos which would be adaptive in resolution when streamed over the network ?

  


• How to merge a segmented webvtt subtitle file and output a single srt file ?

  24 janvier 2019, par Dobbelina

  How to merge a segmented webvtt subtitle file and output a single srt file ?,
  m3u8 looks like this example :

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXT-X-MEDIA-SEQUENCE:1
  
  #EXT-X-INDEPENDENT-SEGMENTS
  
  #EXT-X-TARGETDURATION:4
  
  #USP-X-TIMESTAMP-MAP:MPEGTS=900000,LOCAL=1970-01-01T00:00:00Z
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-1.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-2.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-3.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-4.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-5.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-6.webvtt
  
  #EXT-X-ENDLIST

  I noticed that each segment is not synchronized/cued against total playing time, but against the individual ts segments.
  If ffmpeg could be used to do this, what magic input do i need to give it ?

  A single correctly cued vtt file would work to.
  Thanks for any replies you lovely people !