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[ffmpeg] Framework for feature detection

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Related: #1502, #1237, https://github.com/ytdl-org/youtube-dl/pull/29581
This commit is contained in:
pukkandan
2021-11-04 00:23:48 +05:30
parent 31c49255bf
commit 9af98e17bd
3 changed files with 54 additions and 41 deletions
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15
yt_dlp/utils.py
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@@ -4007,10 +4007,7 @@ def check_executable(exe, args=[]):
return exe
def get_exe_version(exe, args=['--version'],
version_re=None, unrecognized='present'):
""" Returns the version of the specified executable,
or False if the executable is not present """
def _get_exe_version_output(exe, args):
try:
# STDIN should be redirected too. On UNIX-like systems, ffmpeg triggers
# SIGTTOU if yt-dlp is run in the background.
@@ -4022,7 +4019,7 @@ def get_exe_version(exe, args=['--version'],
return False
if isinstance(out, bytes): # Python 2.x
out = out.decode('ascii', 'ignore')
return detect_exe_version(out, version_re, unrecognized)
return out
def detect_exe_version(output, version_re=None, unrecognized='present'):
@@ -4036,6 +4033,14 @@ def detect_exe_version(output, version_re=None, unrecognized='present'):
return unrecognized
def get_exe_version(exe, args=['--version'],
version_re=None, unrecognized='present'):
""" Returns the version of the specified executable,
or False if the executable is not present """
out = _get_exe_version_output(exe, args)
return detect_exe_version(out, version_re, unrecognized) if out else False
class LazyList(collections.abc.Sequence):
''' Lazy immutable list from an iterable
Note that slices of a LazyList are lists and not LazyList'''