python-3.x - 无法识别的选项 'c copy'

Question

作为学习过程和创建方便工具的一部分，我一直在编写脚本。我正在尝试遍历视频文件列表以提取列表中每个视频的特定部分。通过查看示例脚本和 ffmpeg 文档，我终于想到了这个:

import os
import sys
import subprocess as sp

from moviepy.tools import subprocess_call

def ffmpeg_extract_pandomim_subclip():

    with open('videolist.txt') as f:
        lines = f.readlines()
    lines = [x.strip() for x in lines]

    for video in lines:
        name, ext = os.path.splitext(video)
        targetname = "%s-pandomim%s" % (name, ext)
        t1 = "00:10:00"
        t2 = "00:15:00"
        cmd = ["ffmpeg",
               "-i", "%s%s" % (name, ext),
               "-ss", t1,
               "-to", t2, "-c copy", targetname]

        subprocess_call(cmd)

ffmpeg_extract_pandomim_subclip()

我知道这不是理想的方法:我创建了一个 videolist.txt 并逐行列出了该 txt 文件中的所有视频文件名，(T1-1.mp4, T1-2.mp4,... ) 与 python 脚本“new 1.py”共享同一个文件夹，实际视频是 T1-1.mp4、T1-2.mp4、...

我遇到的错误真的让我很困惑，因为当我从 cmd 使用 -c copy 时它工作得很好。

完整的错误是:

C:\Users\çomak\AppData\Local\Programs\Python\Python35-32\python.exe "C:/ffmpeg/bin/new 1.py"

[MoviePy] Running:
>>> ffmpeg -i T1-1.mp4 -ss 00:10:00 -to 00:15:00 -c copy T1-1-pandomim.mp4
[MoviePy] This command returned an error !Traceback (most recent call last):
  File "C:/ffmpeg/bin/new 1.py", line 28, in <module>
    ffmpeg_extract_pandomim_subclip()
  File "C:/ffmpeg/bin/new 1.py", line 25, in ffmpeg_extract_pandomim_subclip
    subprocess_call(cmd)
  File "C:\Users\çomak\AppData\Local\Programs\Python\Python35-32\lib\site-packages\moviepy\tools.py", line 48, in subprocess_call
    raise IOError(err.decode('utf8'))
OSError: ffmpeg version N-83975-g6c4665d Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  libavutil      55. 48.100 / 55. 48.100
  libavcodec     57. 83.100 / 57. 83.100
  libavformat    57. 66.104 / 57. 66.104
  libavdevice    57.  3.100 / 57.  3.100
  libavfilter     6. 76.100 /  6. 76.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Unrecognized option 'c copy'.
Error splitting the argument list: Option not found


Process finished with exit code 1

我正在使用 Pycharm，如果我删除 -c 复制部分它可以工作，但过程很慢......使用 -c 复制，它要快得多。

感谢您为我提供帮助的时间和精力!

Answer 1

这将是由于 subprocess.call 的方式实际调用命令；您不能将所有命令压缩成一个字符串，它们应该完全展开。
要解决此问题，只需将其扩展为它们所在的两个参数

[ ..., "-c", "copy", ... ]