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Re: using ffmpeg command line with python's subprocess module

References <d344154e-1de9-4016-b1fc-d1e9d989529d@googlegroups.com>
Date 2013-12-02 22:40 +1100
Subject Re: using ffmpeg command line with python's subprocess module
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.3457.1385984456.18130.python-list@python.org> (permalink)

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On Mon, Dec 2, 2013 at 10:34 PM, iMath <redstone-cold@163.com> wrote:
> I have few wav files that I can use either of the following command line mentioned here
> https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20%28join,%20merge%29%20media%20files
>  to concatenate
>
>
> ffmpeg -f concat -i <(for f in ./*.wav; do echo "file '$f'"; done) -c copy output.wav
> ffmpeg -f concat -i <(printf "file '%s'\n" ./*.wav) -c copy output.wav
> ffmpeg -f concat -i <(find . -name '*.wav' -printf "file '%p'\n") -c copy output.wav

In bash, the <(...) notation is like piping: it executes the command
inside the parentheses and uses that as standard input to ffmpeg. So
if you work out what the commands are doing (it looks like they emit a
line saying "file '...'" for each .wav file in the current directory,
possibly including subdirectories) and replicate that in Python, you
should be able to make it cross-platform.

ChrisA

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Thread

using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-02 03:34 -0800
  Re: using ffmpeg command line with python's subprocess module Chris Angelico <rosuav@gmail.com> - 2013-12-02 22:40 +1100
  Re: using ffmpeg command line with python's subprocess module Ben Finney <ben+python@benfinney.id.au> - 2013-12-03 08:19 +1100
    Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-02 17:15 -0800
      Re: using ffmpeg command line with python's subprocess module rusi <rustompmody@gmail.com> - 2013-12-02 17:42 -0800
        Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-03 17:42 -0800
        Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-03 17:42 -0800
          Re: using ffmpeg command line with python's subprocess module Andreas Perstinger <andipersti@gmail.com> - 2013-12-04 10:38 +0100
            Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-05 22:23 -0800
              Re: using ffmpeg command line with python's subprocess module Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-06 09:23 +0000
                Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-06 06:52 -0800
                Re: using ffmpeg command line with python's subprocess module Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-06 15:12 +0000
                Re: using ffmpeg command line with python's subprocess module rusi <rustompmody@gmail.com> - 2013-12-06 07:15 -0800
                Re: using ffmpeg command line with python's subprocess module rusi <rustompmody@gmail.com> - 2013-12-06 07:13 -0800
                Re: using ffmpeg command line with python's subprocess module Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-12-06 15:34 +0000
                Re: using ffmpeg command line with python's subprocess module Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-06 15:53 +0000
                Re: using ffmpeg command line with python's subprocess module rusi <rustompmody@gmail.com> - 2013-12-06 08:19 -0800
                Re: using ffmpeg command line with python's subprocess module Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-06 16:25 +0000
                Re: using ffmpeg command line with python's subprocess module rusi <rustompmody@gmail.com> - 2013-12-06 08:45 -0800
                Re: using ffmpeg command line with python's subprocess module MRAB <python@mrabarnett.plus.com> - 2013-12-06 16:41 +0000
                Re: using ffmpeg command line with python's subprocess module rusi <rustompmody@gmail.com> - 2013-12-06 08:53 -0800
                Re: using ffmpeg command line with python's subprocess module Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-12-07 13:01 +1300
              Re: using ffmpeg command line with python's subprocess module Ned Batchelder <ned@nedbatchelder.com> - 2013-12-06 06:31 -0500
          Re: using ffmpeg command line with python's subprocess module Chris Angelico <rosuav@gmail.com> - 2013-12-04 21:51 +1100
            Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-06 06:54 -0800
              Re: using ffmpeg command line with python's subprocess module Chris Angelico <rosuav@gmail.com> - 2013-12-07 01:59 +1100
                Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-09 01:04 -0800
                Re: using ffmpeg command line with python's subprocess module Andreas Perstinger <andipersti@gmail.com> - 2013-12-10 13:59 +0100
    Re: using ffmpeg command line with python's subprocess module Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2013-12-03 10:33 +0100
      Re: using ffmpeg command line with python's subprocess module iMath <redstone-cold@163.com> - 2013-12-03 05:59 -0800
  Re: using ffmpeg command line with python's subprocess module Chris Angelico <rosuav@gmail.com> - 2013-12-03 08:25 +1100

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