Thanks a lot Oscar and Eryksun for all the explanations and answers, I really appreciate.
"So the extra quotes used for the video and audio arguments do actually get passed through to ffmpeg causing confusion." Yes, this worked :) subprocess.Popen(["ffmpeg","-f","dshow","-i","video="+videoinputName,"-f","dshow","-i","audio="+audioinputName,"-q","5","%s"%videoFileOutput],shell=True) On Tue, Sep 3, 2013 at 5:42 PM, Oscar Benjamin <oscar.j.benja...@gmail.com>wrote: > On 3 September 2013 14:48, eryksun <eryk...@gmail.com> wrote: > >> It occurs to me that another possibility is if ffmpeg isn't really an > >> .exe on PATH but rather a .bat file or something. In that case > >> os.system or subprocess shell=True would pick it up but subprocess > >> shell=False might not. I say "might" because at least on some version > >> of Windows CreateProcess can run .bat files directly but I've never > >> seen this documented anywhere. > > > > cmd tries each PATHEXT extension, but CreateProcess only tries .exe, > > and finds ffmpeg.exe. > > > > As to batch files, "Windows Internals" (Microsoft Press) documents > > that CreateProcess starts cmd.exe to run .bat and .cmd files. > > Okay, I see. So it can run a .bat if you give the extension but not > implicitly via PATHEXT. In which case anything without an extension > would have to be an .exe file. And of course this wouldn't explain the > OP's problem anyway since they're getting output from ffmpeg. > > Testing the OP's actual commands out with ffmpeg I see that the > problem is with the quotes. But, as you pointed out in your first > post, it is the unnecessary additional quotes that are the problem > rather than any missing ones. i.e. when I test it I get: > > # os.system output > [dshow @ 02548460] Could not enumerate video devices. > video=video: Input/output error > > # subprocess.Popen output > [dshow @ 02548460] Could not enumerate video devices. > video="video": Input/output error > > So the extra quotes used for the video and audio arguments do actually > get passed through to ffmpeg causing confusion. (I don't have any > video devices here so it's an error either way on this machine). > > > Oscar >
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