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• Running list of cmd.exe commands from maya in Python

  17 décembre 2015, par user3541686

  I am writing a maya python script to batch render a scene into jpgs then use ffmpeg to turn them into a mov. Currently the script saves a string of commands as a bat file which works fine but I’d prefer to just run cmd.exe from maya and execute the list of commands without creating that bat first.

  I’ve been reading about "subprocess.popen()" but I can’t figure out how to get it to iterate through each line, run that command, then move onto the next one when done ie :

  1) Run maya render.exe & save scene as jpegs

  2) ffmpeg jpgs to mov

  I’ve shortened the directories but its essentially this :

  `C:\PROGRA~1\Autodesk\Maya2015\bin\Render.exe -r hw2 -s 100 -e 200 -of jpg -fnc 7 -x 1920 -y 1080 -rd 
  
  "C:\RENDER" 
  
  "C:\SCENE.ma" ffmpeg -y -r 25 -start_number 0100 -i C:\SCENE_%%04d.jpg C:\SCENE.mov

  How would I be able to do this ?

  Thanks !

• Building FFmpeg stream from multiple audio files in python

  4 septembre 2020, par thekangaroo

  I want to stream images by using a python file, that come from a pipe, along with junks of 5 second long audio files (that are then played one after another).

  


  I tried

  


  cmd_stream = ['ffmpeg', 
'-f', 'image2pipe', 
'-thread_queue_size', '2',
'-re',
'-i', '-', # Indicated input comes from pipe 
'-i', 'InputFiles/a%4d.wav', #use existing audio files
'-r', 25,
'-preset', 'veryfast',
'-vcodec', 'mpeg4', 
'-f' , 'mpegts',
'udp://127.0.0.1:1234']
        
pipe = sp.Popen(cmd_stream, stdin=sp.PIPE)


  


  But this does not even start a stream, when piping images. The audio is produced only during the run, does this make a difference ?

  


• How to cut out first 5 seconds with youtube_dl and ffmpeg in python

  23 février 2021, par SvenXP

  i have a python script to download and save a MP3 and i would like to add code to cut out 5 seconds from the beginning of the MP3.

  


  def download():
    ydl_opts = {
        'format': 'bestaudio/best',
        'outtmpl': 'c:/MP3/%(title)s.%(ext)s',
        'cookiefile': 'cookies.txt',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
    }
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download([inpYTLinkSong.get()])


  


  I found some code for command line to cut x seconds :

  


  ffmpeg -ss 00:00:15.00 -i "OUTPUT-OF-FIRST URL" -t 00:00:10.00 -c copy out.mp4

  


  So i think i have to get the -ss part into the postprocessor part in my script, something like :

  


  'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '192',
        'ss':'00:00:05.00'
    }],


  


  But of course its not working with 'ss' or 'duration' (found in ffmpeg docu).

  


  So any ideas what i have to put there instead of 'ss' ?