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import logging
import os
import sys
from lvc import execute
ffmpeg_version = None
_search_path_extra = []
def add_to_search_path(directory):
"""Add a path to the list of paths that which() searches."""
_search_path_extra.append(directory)
def which(name):
if sys.platform == 'win32':
name = name + '.exe' # we're looking for ffmpeg.exe in this case
if sys.platform == 'darwin' and 'Contents/Resources' in __file__:
# look for a bundled version
path = os.path.join(os.path.dirname(__file__),
'..', '..', '..', '..', 'Helpers', name)
if os.path.exists(path):
return path
dirs_to_search = os.environ['PATH'].split(os.pathsep)
dirs_to_search += _search_path_extra
for dirname in dirs_to_search:
fullpath = os.path.join(dirname, name)
# XXX check for +x bit
if os.path.exists(fullpath):
return fullpath
logging.warn("Can't find path to %s (searched in %s)", name,
dirs_to_search)
def memoize(func):
cache = []
def wrapper():
if not cache:
cache.append(func())
return cache[0]
return wrapper
@memoize
def get_ffmpeg_executable_path():
return which("ffmpeg")
avconv = which('avconv')
if avconv is not None:
return avconv
return which("ffmpeg")
def get_ffmpeg_version():
global ffmpeg_version
if ffmpeg_version is None:
commandline = [get_ffmpeg_executable_path(), '-version']
p = execute.Popen(commandline, stderr=open(os.devnull, "wb"))
stdout, _ = p.communicate()
lines = stdout.split('\n')
version = lines[0].rsplit(' ', 1)[1].split('.')
def maybe_int(v):
try:
return int(v)
except ValueError:
return v
ffmpeg_version = tuple(maybe_int(v) for v in version)
return ffmpeg_version
def customize_ffmpeg_parameters(params):
"""Takes a list of parameters and modifies it based on
platform-specific issues. Returns the newly modified list of
parameters.
:param params: list of parameters to modify
:returns: list of modified parameters that will get passed to
ffmpeg
"""
if get_ffmpeg_version() < (0, 8):
# Fallback for older versions of FFmpeg (Ubuntu Natty, in particular).
# see also #18969
params = ['-vpre' if i == '-preset' else i for i in params]
try:
profile_index = params.index('-profile:v')
except ValueError:
pass
else:
if params[profile_index + 1] == 'baseline':
params[profile_index:profile_index+2] = [
'-coder', '0', '-bf', '0', '-refs', '1',
'-flags2', '-wpred-dct8x8']
return params
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