Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #60860

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

Path csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <rosuav@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.003
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'python,': 0.02; 'executes': 0.09; 'subject:command': 0.09; 'subject:module': 0.09; 'subject:using': 0.09; 'cc:addr:python-list': 0.11; '"file': 0.16; '(it': 0.16; 'bash,': 0.16; 'concat': 0.16; 'concatenate': 0.16; 'emit': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'notation': 0.16; 'parentheses': 0.16; 'subject:python': 0.16; 'wrote:': 0.18; 'command': 0.22; 'input': 0.22; 'saying': 0.22; 'cc:addr:python.org': 0.22; 'mon,': 0.24; 'looks': 0.24; 'cc:2**0': 0.24; 'possibly': 0.26; 'header:In- Reply-To:1': 0.27; 'dec': 0.30; 'message-id:@mail.gmail.com': 0.30; 'url:wiki': 0.31; 'directory,': 0.31; 'file': 0.32; 'subject:with': 0.35; 'received:google.com': 0.35; 'doing': 0.36; 'url:org': 0.36; 'should': 0.36; 'files': 0.38; 'pm,': 0.38; 'either': 0.39; 'commands': 0.60; 'mentioned': 0.61; 'url:%20': 0.61; 'here': 0.66; 'replicate': 0.84; 'url:trac': 0.84; 'to:none': 0.92; '2013': 0.98
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=JV4jgluOy87jnjOs/qgfMerE98qGANeuXdcjTARyECE=; b=0a/uwyVg9uch2VJgDEcosJOd0lVWbUKZ9hAh4SukvS1WXB/8jlSBxqYTyUSOFO/A7b luamHXCwak6yBOgB43SmI4VgjfePD6T9j82AU7Fi+McOIMBSdPE25Cnyp71Zl+hh4XON rj079HYNaUoJAKk2TXlla92PUB4WUNmTmI42YbT/nfaV+hz/7Oq7QgfdQAVGgoKYIlbH wDm8xirb1AvZeKJedkuXDRkMySqahhWU46AtNj4kB+TEoFYeSCNMjC8Jz2mLIhZsmq3z pKf4oabJWXqsY2RwhrY4gIm8dTW05aQKCtlbO0oLzLVZHV2va5KXW3jfXXqNR2G4/mNt dMSw==
MIME-Version 1.0
X-Received by 10.68.196.193 with SMTP id io1mr30630395pbc.46.1385984452764; Mon, 02 Dec 2013 03:40:52 -0800 (PST)
In-Reply-To <d344154e-1de9-4016-b1fc-d1e9d989529d@googlegroups.com>
References <d344154e-1de9-4016-b1fc-d1e9d989529d@googlegroups.com>
Date Mon, 2 Dec 2013 22:40:52 +1100
Subject Re: using ffmpeg command line with python's subprocess module
From Chris Angelico <rosuav@gmail.com>
Cc "python-list@python.org" <python-list@python.org>
Content-Type text/plain; charset=UTF-8
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.3457.1385984456.18130.python-list@python.org> (permalink)
Lines 18
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1385984456 news.xs4all.nl 15882 [2001:888:2000:d::a6]:50835
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:60860

Show key headers only | View raw

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

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

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

csiph-web