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: 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: References: Date: Mon, 2 Dec 2013 22:40:52 +1100 Subject: Re: using ffmpeg command line with python's subprocess module From: Chris Angelico Cc: "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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: 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 On Mon, Dec 2, 2013 at 10:34 PM, iMath 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