I have been working on a script as a part of both learning process and creating handy tools. I am trying to loop over a list of video files to extract a certain part of each video on the list. By looking at example scripts and ffmpeg documentation I finally came up with this:
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()
I know this is not the ideal way to do it: I created a videolist.txt and listed all the video file names in that txt file, line by line,(T1-1.mp4, T1-2.mp4,... ) that share the same folder with the python script "new 1.py" and the actual videos which are T1-1.mp4, T1-2.mp4,...
The error I am getting really confuses me because when I use -c copy from cmd it works just fine.
The full error is:
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
I am using Pycharm and if I remove the -c copy part it works, but the process is slow... With -c copy, it is much faster.
I appreciate your time and effort to help me out!
This is going to be due to the way that subprocess.call actually invokes the command; you can not condense all of your commands into a single string, they should be fully expanded.
To fix this, simply expand it to the two parameters that they are
[ ..., "-c", "copy", ... ]