bazarr/libs/knowit/providers/ffmpeg.py

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import json
import logging
import re
from logging import NullHandler, getLogger
from subprocess import check_output
from knowit import VIDEO_EXTENSIONS
from knowit.core import Property
from knowit.properties import (
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AudioChannels,
AudioCodec,
AudioProfile,
Basic,
Duration,
Language,
Quantity,
Ratio,
ScanType,
SubtitleFormat,
VideoCodec,
VideoProfile,
VideoProfileLevel,
YesNo,
)
from knowit.provider import (
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MalformedFileError,
Provider,
)
from knowit.rules import (
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AudioChannelsRule,
ClosedCaptionRule,
HearingImpairedRule,
LanguageRule,
ResolutionRule,
)
from knowit.serializer import get_json_encoder
from knowit.units import units
from knowit.utils import (
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define_candidate,
detect_os,
)
logger = getLogger(__name__)
logger.addHandler(NullHandler())
WARN_MSG = r'''
=========================================================================================
FFmpeg (ffprobe) not found on your system or could not be loaded.
Visit https://ffmpeg.org/download.html to download it.
If you still have problems, please check if the downloaded version matches your system.
To load FFmpeg (ffprobe) from a specific location, please define the location as follow:
knowit --ffmpeg /usr/local/ffmpeg/bin <video_path>
knowit --ffmpeg /usr/local/ffmpeg/bin/ffprobe <video_path>
knowit --ffmpeg "C:\Program Files\FFmpeg" <video_path>
knowit --ffmpeg C:\Software\ffprobe.exe <video_path>
=========================================================================================
'''
class FFmpegExecutor:
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"""Executor that knows how to execute media info: using ctypes or cli."""
version_re = re.compile(r'\bversion\s+(?P<version>[^\b\s]+)')
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locations = {
'unix': ('/usr/local/ffmpeg/lib', '/usr/local/ffmpeg/bin', '__PATH__'),
'windows': ('__PATH__', ),
'macos': ('__PATH__', ),
}
def __init__(self, location, version):
"""Initialize the object."""
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self.location = location
self.version = version
def extract_info(self, filename):
"""Extract media info."""
json_dump = self._execute(filename)
return json.loads(json_dump)
def _execute(self, filename):
raise NotImplementedError
@classmethod
def _get_version(cls, output):
match = cls.version_re.search(output)
if match:
version = match.groupdict()['version']
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return version
@classmethod
def get_executor_instance(cls, suggested_path=None):
"""Return executor instance."""
os_family = detect_os()
logger.debug('Detected os: %s', os_family)
for exec_cls in (FFmpegCliExecutor, ):
executor = exec_cls.create(os_family, suggested_path)
if executor:
return executor
class FFmpegCliExecutor(FFmpegExecutor):
"""Executor that uses FFmpeg (ffprobe) cli."""
names = {
'unix': ('ffprobe', ),
'windows': ('ffprobe.exe', ),
'macos': ('ffprobe', ),
}
def _execute(self, filename):
return check_output([self.location, '-v', 'quiet', '-print_format', 'json',
'-show_format', '-show_streams', '-sexagesimal', filename]).decode()
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@classmethod
def create(cls, os_family=None, suggested_path=None):
"""Create the executor instance."""
for candidate in define_candidate(cls.locations, cls.names, os_family, suggested_path):
try:
output = check_output([candidate, '-version']).decode()
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version = cls._get_version(output)
if version:
logger.debug('FFmpeg cli detected: %s v%s', candidate, version)
return FFmpegCliExecutor(candidate, version.split('.'))
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except OSError:
pass
class FFmpegProvider(Provider):
"""FFmpeg provider."""
def __init__(self, config, suggested_path=None):
"""Init method."""
super().__init__(config, {
'general': {
'title': Property('tags.title', description='media title'),
'path': Property('filename', description='media path'),
'duration': Duration('duration', description='media duration'),
'size': Quantity('size', unit=units.byte, description='media size'),
'bit_rate': Quantity('bit_rate', unit=units.bps, description='media bit rate'),
},
'video': {
'id': Basic('index', data_type=int, allow_fallback=True, description='video track number'),
'name': Property('tags.title', description='video track name'),
'language': Language('tags.language', description='video language'),
'duration': Duration('duration', description='video duration'),
'width': Quantity('width', unit=units.pixel),
'height': Quantity('height', unit=units.pixel),
'scan_type': ScanType(config, 'field_order', default='Progressive', description='video scan type'),
'aspect_ratio': Ratio('display_aspect_ratio', description='display aspect ratio'),
'pixel_aspect_ratio': Ratio('sample_aspect_ratio', description='pixel aspect ratio'),
'resolution': None, # populated with ResolutionRule
'frame_rate': Ratio('r_frame_rate', unit=units.FPS, description='video frame rate'),
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# frame_rate_mode
'bit_rate': Quantity('bit_rate', unit=units.bps, description='video bit rate'),
'bit_depth': Quantity('bits_per_raw_sample', unit=units.bit, description='video bit depth'),
'codec': VideoCodec(config, 'codec_name', description='video codec'),
'profile': VideoProfile(config, 'profile', description='video codec profile'),
'profile_level': VideoProfileLevel(config, 'level', description='video codec profile level'),
# 'profile_tier': VideoProfileTier(config, 'codec_profile', description='video codec profile tier'),
'forced': YesNo('disposition.forced', hide_value=False, description='video track forced'),
'default': YesNo('disposition.default', hide_value=False, description='video track default'),
},
'audio': {
'id': Basic('index', data_type=int, allow_fallback=True, description='audio track number'),
'name': Property('tags.title', description='audio track name'),
'language': Language('tags.language', description='audio language'),
'duration': Duration('duration', description='audio duration'),
'codec': AudioCodec(config, 'profile', 'codec_name', description='audio codec'),
'profile': AudioProfile(config, 'profile', description='audio codec profile'),
'channels_count': AudioChannels('channels', description='audio channels count'),
'channels': None, # populated with AudioChannelsRule
'bit_depth': Quantity('bits_per_raw_sample', unit=units.bit, description='audio bit depth'),
'bit_rate': Quantity('bit_rate', unit=units.bps, description='audio bit rate'),
'sampling_rate': Quantity('sample_rate', unit=units.Hz, description='audio sampling rate'),
'forced': YesNo('disposition.forced', hide_value=False, description='audio track forced'),
'default': YesNo('disposition.default', hide_value=False, description='audio track default'),
},
'subtitle': {
'id': Basic('index', data_type=int, allow_fallback=True, description='subtitle track number'),
'name': Property('tags.title', description='subtitle track name'),
'language': Language('tags.language', description='subtitle language'),
'hearing_impaired': YesNo('disposition.hearing_impaired',
hide_value=False, description='subtitle hearing impaired'),
'closed_caption': None, # populated with ClosedCaptionRule
'format': SubtitleFormat(config, 'codec_name', description='subtitle format'),
'forced': YesNo('disposition.forced', hide_value=False, description='subtitle track forced'),
'default': YesNo('disposition.default', hide_value=False, description='subtitle track default'),
},
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}, {
'video': {
'language': LanguageRule('video language'),
'resolution': ResolutionRule('video resolution'),
},
'audio': {
'language': LanguageRule('audio language'),
'channels': AudioChannelsRule('audio channels'),
},
'subtitle': {
'language': LanguageRule('subtitle language'),
'hearing_impaired': HearingImpairedRule('subtitle hearing impaired'),
'closed_caption': ClosedCaptionRule('closed caption'),
},
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})
self.executor = FFmpegExecutor.get_executor_instance(suggested_path)
def accepts(self, video_path):
"""Accept any video when FFprobe is available."""
if self.executor is None:
logger.warning(WARN_MSG)
self.executor = False
return self.executor and video_path.lower().endswith(VIDEO_EXTENSIONS)
def describe(self, video_path, context):
"""Return video metadata."""
data = self.executor.extract_info(video_path)
def debug_data():
"""Debug data."""
return json.dumps(data, cls=get_json_encoder(context), indent=4, ensure_ascii=False)
context['debug_data'] = debug_data
if logger.isEnabledFor(logging.DEBUG):
logger.debug('Video %r scanned using ffmpeg %r has raw data:\n%s',
video_path, self.executor.location, debug_data())
general_track = data.get('format') or {}
if 'tags' in general_track:
general_track['tags'] = {k.lower(): v for k, v in general_track['tags'].items()}
video_tracks = []
audio_tracks = []
subtitle_tracks = []
for track in data.get('streams'):
track_type = track.get('codec_type')
if track_type == 'video':
video_tracks.append(track)
elif track_type == 'audio':
audio_tracks.append(track)
elif track_type == 'subtitle':
subtitle_tracks.append(track)
result = self._describe_tracks(video_path, general_track, video_tracks, audio_tracks, subtitle_tracks, context)
if not result:
raise MalformedFileError
result['provider'] = self.executor.location
result['provider'] = {
'name': 'ffmpeg',
'version': self.version
}
return result
@property
def version(self):
"""Return ffmpeg version information."""
if not self.executor:
return {}
version = '.'.join(map(str, self.executor.version))
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return {self.executor.location: f'v{version}'}