using ffmpeg command line with python's subprocess module
iMath
redstone-cold at 163.com
Mon Dec 2 20:15:42 EST 2013
在 2013年12月3日星期二UTC+8上午5时19分21秒,Ben Finney写道:
> Chris Angelico <rosuav at gmail.com> writes:
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>
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> > On Mon, Dec 2, 2013 at 10:34 PM, iMath <redstone-cold at 163.com> wrote:
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> > > ffmpeg -f concat -i <(for f in ./*.wav; do echo "file '$f'"; done) -c copy output.wav
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> > > ffmpeg -f concat -i <(printf "file '%s'\n" ./*.wav) -c copy output.wav
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> > > ffmpeg -f concat -i <(find . -name '*.wav' -printf "file '%p'\n") -c copy output.wav
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> >
>
> > In bash, the <(...) notation is like piping: it executes the command
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> > inside the parentheses and uses that as standard input to ffmpeg.
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> Not standard input, no. What it does is create a temporary file to
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> contain the result, and inserts that file name on the command line. This
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> is good for programs that require an actual file, not standard input.
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>
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> So the above usage seems right to me: the ‘ffmpeg -i FOO’ option is
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> provided with a filename dynamically created by Bash, referring to a
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> temporary file that contains the output of the subshell.
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>
>
> --
>
> \ “Welchen Teil von ‘Gestalt’ verstehen Sie nicht? [What part of |
>
> `\ ‘gestalt’ don't you understand?]” —Karsten M. Self |
>
> _o__) |
>
> Ben Finney
so is there any way to create a temporary file by Python here ?
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