Python Popen - 未知参数：|

时间：2016-01-20 09:11:08

标签： python windows python-2.7 popen

我在使用下面的脚本时得到Unknown argument: |，我不确定为什么它不喜欢|。我在Windows上，使用Python 2.7.11：

import subprocess
from subprocess import Popen, PIPE, STDOUT
import time

command = 'VSPipe.exe --y4m script.vpy - | ffmpeg.exe -f yuv4mpegpipe -i - -c:v prores -an output.mov'

process1 = Popen(command, stderr=PIPE, shell=False)

while True:
    line = process1.stderr.readline().decode('utf-8')
    print line
    time.sleep(2)

更新： 使用下面的建议我现在尝试了这个，但我得到了pipe:: Operation not permitted。我做错了什么？

import subprocess
from subprocess import Popen, PIPE, STDOUT
import time

command1 = 'VSPipe.exe --y4m script.vpy -'
command2 = 'ffmpeg.exe -f yuv4mpegpipe -i - -c:v prores -an output.mov'

process1 = Popen(command1, stdout=PIPE)
process2 = Popen(command2, stdin=process1.stdout, stderr=PIPE)

print process2.communicate()

另一个更新： 因此，使用下面的建议，并尝试其他的东西，我会得到相同的结果pipe:: Operation not permitted。这是完整的sdterr，我还可以尝试其他内容：

"F:/ffmpeg/VapourSynth/VSPipe.exe" --y4m "C:/Users/myself/Desktop/script.vpy" - 
"F:/ffmpeg/ffmpeg.exe" -f yuv4mpegpipe -i - -c:v prores -an -y "//192.168.0.100/media/temp/OutMov.mov"
ffmpeg version N-77203-gb8e5b1d Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 5.2.0 (GCC)
  configuration: --arch=x86 --target-os=mingw32 --cross-prefix=/Users/myself/Desktop/Download/ffmpeg-windows-build-helpers-master/sandbox/mingw-w64-i686/bin/i686-w64-mingw32- --pkg-config=pkg-config --disable-w32threads --enable-gpl --enable-libsoxr --enable-fontconfig --enable-libass --enable-libutvideo --enable-libbluray --enable-iconv --enable-libtwolame --extra-cflags=-DLIBTWOLAME_STATIC --enable-libzvbi --enable-libcaca --enable-libmodplug --extra-libs=-lstdc++ --extra-libs=-lpng --enable-libvidstab --enable-libx265 --enable-decklink --extra-libs=-loleaut32 --enable-libx264 --enable-libxvid --enable-libmp3lame --enable-version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --enable-libopus --enable-frei0r --enable-filter=frei0r --enable-libvo-aacenc --enable-bzlib --enable-libxavs --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-libschroedinger --enable-libvpx --enable-libilbc --enable-libwavpack --enable-libwebp --enable-libgme --enable-dxva2 --enable-libdcadec --enable-avisynth --enable-gray --enable-libopenh264 --extra-libs=-lpsapi --extra-cflags= --enable-static --disable-shared --prefix=/Users/myself/Desktop/Download/ffmpeg-windows-build-helpers-master/sandbox/mingw-w64-i686/i686-w64-mingw32 --enable-nonfree --enable-libfdk-aac --disable-libfaac --enable-nvenc --enable-runtime-cpudetect
  libavutil      55. 10.100 / 55. 10.100
  libavcodec     57. 17.100 / 57. 17.100
  libavformat    57. 19.100 / 57. 19.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 20.100 /  6. 20.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
pipe:: Operation not permitted

更新： 而她是ffmpeg报告：

F:/ffmpeg/ffmpeg.exe -f yuv4mpegpipe -i - -c:v prores -an -y //192.168.0.100/media/temp/OutMov.mov -report
ffmpeg version N-77203-gb8e5b1d Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 5.2.0 (GCC)
  configuration: --arch=x86 --target-os=mingw32 --cross-prefix=/Users/myself/Desktop/Download/ffmpeg-windows-build-helpers-master/sandbox/mingw-w64-i686/bin/i686-w64-mingw32- --pkg-config=pkg-config --disable-w32threads --enable-gpl --enable-libsoxr --enable-fontconfig --enable-libass --enable-libutvideo --enable-libbluray --enable-iconv --enable-libtwolame --extra-cflags=-DLIBTWOLAME_STATIC --enable-libzvbi --enable-libcaca --enable-libmodplug --extra-libs=-lstdc++ --extra-libs=-lpng --enable-libvidstab --enable-libx265 --enable-decklink --extra-libs=-loleaut32 --enable-libx264 --enable-libxvid --enable-libmp3lame --enable-version3 --enable-zlib --enable-librtmp --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --enable-libopus --enable-frei0r --enable-filter=frei0r --enable-libvo-aacenc --enable-bzlib --enable-libxavs --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-libschroedinger --enable-li  libavutil      55. 10.100 / 55. 10.100
  libavcodec     57. 17.100 / 57. 17.100
  libavformat    57. 19.100 / 57. 19.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 20.100 /  6. 20.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Splitting the commandline.
Reading option '-f' ... matched as option 'f' (force format) with argument 'yuv4mpegpipe'.
Reading option '-i' ... matched as input file with argument '-'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'prores'.
Reading option '-an' ... matched as option 'an' (disable audio) with argument '1'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '//192.168.0.100/media/temp/OutMov.mov' ... matched as output file.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file -.
Applying option f (force format) with argument yuv4mpegpipe.
Successfully parsed a group of options.
Opening an input file: -.
[AVIOContext @ 006d9800] Statistics: 0 bytes read, 0 seeks
pipe:: Operation not permitted

更新： 使用此代码，我仍然得到相同的结果pipe:: Operation not permitted：

import subprocess
import os
from subprocess import Popen, PIPE, STDOUT
import shlex

VsPipe = 'F:/ffmpeg/VapourSynth/VSPipe.exe'
vpyScript = 'C:/Users/myself/Desktop/Boychoir-preview_SMALL_JobID_189.vpy'
ffmpeg = 'F:/ffmpeg/ffmpeg.exe'
outputPath = '//192.168.0.100/media/temp/OutMov.mov'

command1 = shlex.split('"%s" --y4m "%s" - ' % (VsPipe, vpyScript))
command2 = shlex.split('"%s" -f yuv4mpegpipe -i - -c:v prores -an -y "%s" -report' % (ffmpeg, outputPath))

process1 = subprocess.Popen(command1, stdout=subprocess.PIPE)
ls_out, _ = process1.communicate()
process2 = subprocess.Popen(command2, stdin=subprocess.PIPE, stderr=subprocess.PIPE)

grep_out, grep_err = process2.communicate(input=ls_out)
print grep_err

更新： 修复了，原来是一个文件路径权限问题，感谢所有的帮助。

3 个答案:

答案 0 :(得分：2)

当您将shell设置为False时，args（即第一个）参数应该是程序的名称（如果它是一个字符串）。否则它应该是一个字符串序列，第一个是程序，其余的是参数。

使用管道时shell的重要性在于：

VSPipe.exe --y4m script.vpy - | ffmpeg.exe -f yuv4mpegpipe -i - -c:v prores -an output.mov

所有都不被视为参数。 VSPipe.exe的论据是--y4m和script.vpy。 ffmpeg.exe的参数是-f，yuv4mpegpipe，-i等。外壳是什么处理管道 - 它启动两个程序（提供其参数），但它所以首先创建一个管道，使第一个stdout连接到第二个stdin。

如果你没有支持管道的shell，你可以通过启动它们来模拟python中的那个，然后将输出从第一个传输到第二个。

答案 1 :(得分：0)

来自子流程docs：

  

当您需要管道时，请使用Popen和communic（）方法。

在@ skyking的答案和更新的代码的基础上，看起来你只需要使用communication（）：

# Simple Windows script to confirm existence of Desktop directory in users home space
# ls -al | grep Desktop
# This requires Windows Git to be installed for unix utils like ls, grep

# NOTE: you may have problems with this if you're using built in Windows shell
# utilities like dir etc.. This is because these are built into the shell and
# aren't executables on your path. Use shell=True if you have to use these.

import os
import subprocess

# Change to home directory
os.chdir(os.path.expanduser("~"))

# Command parameters sent to Popen initializer should be lists
# Here we are only interested in the output so PIPE stdout
ls_process = subprocess.Popen(['ls', '-al'], stdout=subprocess.PIPE)

# When working with subprocess PIPE we need to use the communicate() method
# We're only interested in stdout so _ is used to throw away stderr (which will be
# None anyway since we didn't pipe stderr)
ls_out, _ = ls_process.communicate()

# We then create our second process but this time we're interested in piping the
# first command into stdin, using stdout and potentially stderr if there was a problem
grep_process = subprocess.Popen(['grep', 'Desktop'],
                                   stdin=subprocess.PIPE,
                                   stdout=subprocess.PIPE,
                                   stderr=subprocess.PIPE)

# We use communicate() again but this time we give the output string of the first command
# as a parameter to communicate()
grep_out, grep_err = grep_process.communicate(input=ls_out)

print grep_out

Subprocess是第一次获得正确的难度模块，看看其他项目中使用它的可靠示例非常棒。

另一个好的建议是尝试尽可能保持平台独立性。即使你无意在Windows以外的任何地方运行它，它也可以帮助你避免你正在使用的系统的特性。

答案 2 :(得分：0)

首先，我建议您使用所有.exe的完整路径，这里是我用来执行此操作的代码。 

path = get_locate_command_result(bin_name, which_command="where", default_path=default_path)

对于Windows：

# use "" beacause of '\'
command1 = ('"%s" --y4m script.vpy -'
            % _get_locate_command_result("VSPipe.exe", "where", "VSPipe.exe"))
command2 = ('"%s" -f yuv4mpegpipe -i - -c:v prores -an output.mov'
            % _get_locate_command_result("VSPipe.exe", "where", "ffmpeg.exe"))

# Popen needs sequence of string
cmd1 = shlex.split(command1)
cmd2 = shlex.split(command2)

process1 = Popen(cmd1, stdout=PIPE)
process2 = Popen(cmd2, stdin=process1.stdout, stderr=PIPE)

print(process2.communicate())

所以你可以尝试类似的东西（未经测试）：

<?php
global $user_login;
$current .= $user_login ;
$book = array(
"title" => $current,
"author" => "David Flanagan",
"edition" => 6
);
?>

<script type="text/javascript">
var book = <?php echo json_encode($book, JSON_PRETTY_PRINT) ?>;

alert(book.title);
</script>
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