bazarr/libs/ffsubsync/ffmpeg_utils.py

77 lines
2.8 KiB
Python

# -*- coding: utf-8 -*-
import logging
import os
import platform
import subprocess
from .constants import SUBSYNC_RESOURCES_ENV_MAGIC
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
# ref: https://github.com/pyinstaller/pyinstaller/wiki/Recipe-subprocess
# Create a set of arguments which make a ``subprocess.Popen`` (and
# variants) call work with or without Pyinstaller, ``--noconsole`` or
# not, on Windows and Linux. Typical use::
#
# subprocess.call(['program_to_run', 'arg_1'], **subprocess_args())
#
# When calling ``check_output``::
#
# subprocess.check_output(['program_to_run', 'arg_1'],
# **subprocess_args(False))
def subprocess_args(include_stdout=True):
# The following is true only on Windows.
if hasattr(subprocess, 'STARTUPINFO'):
# On Windows, subprocess calls will pop up a command window by default
# when run from Pyinstaller with the ``--noconsole`` option. Avoid this
# distraction.
si = subprocess.STARTUPINFO()
si.dwFlags |= subprocess.STARTF_USESHOWWINDOW
# Windows doesn't search the path by default. Pass it an environment so
# it will.
env = os.environ
else:
si = None
env = None
# ``subprocess.check_output`` doesn't allow specifying ``stdout``::
#
# Traceback (most recent call last):
# File "test_subprocess.py", line 58, in <module>
# **subprocess_args(stdout=None))
# File "C:\Python27\lib\subprocess.py", line 567, in check_output
# raise ValueError('stdout argument not allowed, it will be overridden.')
# ValueError: stdout argument not allowed, it will be overridden.
#
# So, add it only if it's needed.
if include_stdout:
ret = {'stdout': subprocess.PIPE}
else:
ret = {}
# On Windows, running this from the binary produced by Pyinstaller
# with the ``--noconsole`` option requires redirecting everything
# (stdin, stdout, stderr) to avoid an OSError exception
# "[Error 6] the handle is invalid."
ret.update({'stdin': subprocess.PIPE,
'stderr': subprocess.PIPE,
'startupinfo': si,
'env': env})
return ret
def ffmpeg_bin_path(bin_name, gui_mode, ffmpeg_resources_path=None):
if platform.system() == 'Windows':
bin_name = '{}.exe'.format(bin_name)
if ffmpeg_resources_path is not None:
return os.path.join(ffmpeg_resources_path, bin_name)
try:
resource_path = os.environ[SUBSYNC_RESOURCES_ENV_MAGIC]
if len(resource_path) > 0:
return os.path.join(resource_path, 'ffmpeg-bin', bin_name)
except KeyError:
if gui_mode:
logger.info("Couldn't find resource path; falling back to searching system path")
return bin_name