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• Python, ffmpeg split list of audio files

  24 novembre 2020, par emil

  I know how to split one single audio file with python and ffmpeg :

  


  command = "ffmpeg -i a.wav -f segment -segment_time 60 -c copy out_dir/output%09d.wav"
command = shlex.split(command)
subprocess.run(command)


  


  For my current task, I have a list of several hundred .wav files I want to split.

  


  My current solution is :

  


  def parse_and_split_dir(directory, out_dir):
  files = [x for x in os.listdir(directory) if ".wav" in x]
  print(files)
  cntr = 0
  for wav in files:
    wav = wav.replace(" ", "\ ")
    temp_dir = os.path.join(out_dir, str(cntr))
    Path(temp_dir).mkdir(parents=True, exist_ok=True)
    temp_dir = os.path.join(temp_dir, "output%05d.wav")
    command = "ffmpeg -i {} -f segment -segment_time 60 -c copy {}".format(os.path.join(directory, wav), temp_dir)
    command = shlex.split(command)
    subprocess.run(command)
    cntr += 1




  


  I list all .wav files, and for each file I create a directory where I store the split files into. This implies that file naming start with index 1 for each new file.
E.g. folder 1 contains files ...1.wav to ...9.wav, folder 2 contains ...1.wav to ...13.wav and so on.

  


  In short, I ideally want to parse the whole directory with a single command, while keeping the naming continually from file to file, e.g. when the last wav saved its last split with ...10.split, the next split for the next file should be saved as ..11.split.

  


  I thought about first concatenating all the single files to one file, and then splitting them again (which introduces massive overhead), and unnecessarily consumes memory and disk space. An alternative I thought of was using a *.wav wildcard, but ffmpeg found no file called *.wav(which is expected).

  


  Related question : 1

  


• Split bulk video fast by using ffmpeg ? [duplicate]

  9 avril 2014, par user3513568

  This question is an exact duplicate of :

  • How to split bulk video fast by using ffmpeg ?
    
    1 answer
    

  I have a lot of videos, so I want to split them automatically. And they will be divided into 2 parts :

  Part 1: 15 minutes
  
  Part 2: the rest

  This is code I have

  ffmpeg -i input -t 00:15:00 -codec copy output
  
  ffmpeg -ss 00:15:00 -i input -codec copy output

  However, I don't know how to split batch all video in 1 folder because I have a lot of file !

  Searched a lot, but did not find. Please, help.

  I use windows OS and I want to stream copy.

• Parsing split video with ffmpeg

  13 mai 2016, par mtomy

  I have video file split into few chunks. Split done and random file positions, but chunks are large enough.

  I need to parse every part with different instances of AVFormatContext. Chunks come one after another in right order. I think there are two options here :

  1. Being able to save and restore AVFormatContext state ;
  2. Save video file header (from first chunk) and attach it to every chunk.

  I tried both but no success. First approach requires to go too deeply beyond public API of ffmpeg. With second approach I am unable to merge header with new chunk so that ffmpeg can handle it.

  Can you help me with this ?

  Thank you.