yt_dlp/postprocessor/ffmpeg.py

   1 import collections
   2 import contextvars
   3 import itertools
   4 import json
   5 import os
   6 import re
   7 import subprocess
   8 import time
   9
  10 from .common import PostProcessor
  11 from ..compat import functools, imghdr
  12 from ..utils import (
  13     MEDIA_EXTENSIONS,
  14     ISO639Utils,
  15     Popen,
  16     PostProcessingError,
  17     _get_exe_version_output,
  18     deprecation_warning,
  19     detect_exe_version,
  20     determine_ext,
  21     dfxp2srt,
  22     encodeArgument,
  23     encodeFilename,
  24     filter_dict,
  25     float_or_none,
  26     is_outdated_version,
  27     orderedSet,
  28     prepend_extension,
  29     replace_extension,
  30     shell_quote,
  31     traverse_obj,
  32     variadic,
  33     write_json_file,
  34 )
  35
  36 EXT_TO_OUT_FORMATS = {
  37     'aac': 'adts',
  38     'flac': 'flac',
  39     'm4a': 'ipod',
  40     'mka': 'matroska',
  41     'mkv': 'matroska',
  42     'mpg': 'mpeg',
  43     'ogv': 'ogg',
  44     'ts': 'mpegts',
  45     'wma': 'asf',
  46     'wmv': 'asf',
  47     'weba': 'webm',
  48     'vtt': 'webvtt',
  49 }
  50 ACODECS = {
  51     # name: (ext, encoder, opts)
  52     'mp3': ('mp3', 'libmp3lame', ()),
  53     'aac': ('m4a', 'aac', ('-f', 'adts')),
  54     'm4a': ('m4a', 'aac', ('-bsf:a', 'aac_adtstoasc')),
  55     'opus': ('opus', 'libopus', ()),
  56     'vorbis': ('ogg', 'libvorbis', ()),
  57     'flac': ('flac', 'flac', ()),
  58     'alac': ('m4a', None, ('-acodec', 'alac')),
  59     'wav': ('wav', None, ('-f', 'wav')),
  60 }
  61
  62
  63 def create_mapping_re(supported):
  64     return re.compile(r'{0}(?:/{0})*$'.format(r'(?:\s*\w+\s*>)?\s*(?:%s)\s*' % '|'.join(supported)))
  65
  66
  67 def resolve_mapping(source, mapping):
  68     """
  69     Get corresponding item from a mapping string like 'A>B/C>D/E'
  70     @returns    (target, error_message)
  71     """
  72     for pair in mapping.lower().split('/'):
  73         kv = pair.split('>', 1)
  74         if len(kv) == 1 or kv[0].strip() == source:
  75             target = kv[-1].strip()
  76             if target == source:
  77                 return target, f'already is in target format {source}'
  78             return target, None
  79     return None, f'could not find a mapping for {source}'
  80
  81
  82 class FFmpegPostProcessorError(PostProcessingError):
  83     pass
  84
  85
  86 class FFmpegPostProcessor(PostProcessor):
  87     _ffmpeg_location = contextvars.ContextVar('ffmpeg_location', default=None)
  88
  89     def __init__(self, downloader=None):
  90         PostProcessor.__init__(self, downloader)
  91         self._prefer_ffmpeg = self.get_param('prefer_ffmpeg', True)
  92         self._paths = self._determine_executables()
  93
  94     @staticmethod
  95     def get_versions_and_features(downloader=None):
  96         pp = FFmpegPostProcessor(downloader)
  97         return pp._versions, pp._features
  98
  99     @staticmethod
 100     def get_versions(downloader=None):
 101         return FFmpegPostProcessor.get_versions_and_features(downloader)[0]
 102
 103     _ffmpeg_to_avconv = {'ffmpeg': 'avconv', 'ffprobe': 'avprobe'}
 104
 105     def _determine_executables(self):
 106         programs = [*self._ffmpeg_to_avconv.keys(), *self._ffmpeg_to_avconv.values()]
 107
 108         location = self.get_param('ffmpeg_location', self._ffmpeg_location.get())
 109         if location is None:
 110             return {p: p for p in programs}
 111
 112         if not os.path.exists(location):
 113             self.report_warning(
 114                 f'ffmpeg-location {location} does not exist! Continuing without ffmpeg', only_once=True)
 115             return {}
 116         elif os.path.isdir(location):
 117             dirname, basename, filename = location, None, None
 118         else:
 119             filename = os.path.basename(location)
 120             basename = next((p for p in programs if p in filename), 'ffmpeg')
 121             dirname = os.path.dirname(os.path.abspath(location))
 122             if basename in self._ffmpeg_to_avconv.keys():
 123                 self._prefer_ffmpeg = True
 124
 125         paths = {p: os.path.join(dirname, p) for p in programs}
 126         if basename and basename in filename:
 127             for p in programs:
 128                 path = os.path.join(dirname, filename.replace(basename, p))
 129                 if os.path.exists(path):
 130                     paths[p] = path
 131         if basename:
 132             paths[basename] = location
 133         return paths
 134
 135     _version_cache, _features_cache = {None: None}, {}
 136
 137     def _get_ffmpeg_version(self, prog):
 138         path = self._paths.get(prog)
 139         if path in self._version_cache:
 140             return self._version_cache[path], self._features_cache.get(path, {})
 141         out = _get_exe_version_output(path, ['-bsfs'])
 142         ver = detect_exe_version(out) if out else False
 143         if ver:
 144             regexs = [
 145                 r'(?:\d+:)?([0-9.]+)-[0-9]+ubuntu[0-9.]+$',  # Ubuntu, see [1]
 146                 r'n([0-9.]+)$',  # Arch Linux
 147                 # 1. http://www.ducea.com/2006/06/17/ubuntu-package-version-naming-explanation/
 148             ]
 149             for regex in regexs:
 150                 mobj = re.match(regex, ver)
 151                 if mobj:
 152                     ver = mobj.group(1)
 153         self._version_cache[path] = ver
 154         if prog != 'ffmpeg' or not out:
 155             return ver, {}
 156
 157         mobj = re.search(r'(?m)^\s+libavformat\s+(?:[0-9. ]+)\s+/\s+(?P<runtime>[0-9. ]+)', out)
 158         lavf_runtime_version = mobj.group('runtime').replace(' ', '') if mobj else None
 159         self._features_cache[path] = features = {
 160             'fdk': '--enable-libfdk-aac' in out,
 161             'setts': 'setts' in out.splitlines(),
 162             'needs_adtstoasc': is_outdated_version(lavf_runtime_version, '57.56.100', False),
 163         }
 164         return ver, features
 165
 166     @property
 167     def _versions(self):
 168         return filter_dict({self.basename: self._version, self.probe_basename: self._probe_version})
 169
 170     @functools.cached_property
 171     def basename(self):
 172         self._version  # run property
 173         return self.basename
 174
 175     @functools.cached_property
 176     def probe_basename(self):
 177         self._probe_version  # run property
 178         return self.probe_basename
 179
 180     def _get_version(self, kind):
 181         executables = (kind, )
 182         if not self._prefer_ffmpeg:
 183             executables = (kind, self._ffmpeg_to_avconv[kind])
 184         basename, version, features = next(filter(
 185             lambda x: x[1], ((p, *self._get_ffmpeg_version(p)) for p in executables)), (None, None, {}))
 186         if kind == 'ffmpeg':
 187             self.basename, self._features = basename, features
 188         else:
 189             self.probe_basename = basename
 190         if basename == self._ffmpeg_to_avconv[kind]:
 191             self.deprecated_feature(f'Support for {self._ffmpeg_to_avconv[kind]} is deprecated and '
 192                                     f'may be removed in a future version. Use {kind} instead')
 193         return version
 194
 195     @functools.cached_property
 196     def _version(self):
 197         return self._get_version('ffmpeg')
 198
 199     @functools.cached_property
 200     def _probe_version(self):
 201         return self._get_version('ffprobe')
 202
 203     @property
 204     def available(self):
 205         return self.basename is not None
 206
 207     @property
 208     def executable(self):
 209         return self._paths.get(self.basename)
 210
 211     @property
 212     def probe_available(self):
 213         return self.probe_basename is not None
 214
 215     @property
 216     def probe_executable(self):
 217         return self._paths.get(self.probe_basename)
 218
 219     @staticmethod
 220     def stream_copy_opts(copy=True, *, ext=None):
 221         yield from ('-map', '0')
 222         # Don't copy Apple TV chapters track, bin_data
 223         # See https://github.com/yt-dlp/yt-dlp/issues/2, #19042, #19024, https://trac.ffmpeg.org/ticket/6016
 224         yield from ('-dn', '-ignore_unknown')
 225         if copy:
 226             yield from ('-c', 'copy')
 227         if ext in ('mp4', 'mov', 'm4a'):
 228             yield from ('-c:s', 'mov_text')
 229
 230     def check_version(self):
 231         if not self.available:
 232             raise FFmpegPostProcessorError('ffmpeg not found. Please install or provide the path using --ffmpeg-location')
 233
 234         required_version = '10-0' if self.basename == 'avconv' else '1.0'
 235         if is_outdated_version(self._version, required_version):
 236             self.report_warning(f'Your copy of {self.basename} is outdated, update {self.basename} '
 237                                 f'to version {required_version} or newer if you encounter any errors')
 238
 239     def get_audio_codec(self, path):
 240         if not self.probe_available and not self.available:
 241             raise PostProcessingError('ffprobe and ffmpeg not found. Please install or provide the path using --ffmpeg-location')
 242         try:
 243             if self.probe_available:
 244                 cmd = [
 245                     encodeFilename(self.probe_executable, True),
 246                     encodeArgument('-show_streams')]
 247             else:
 248                 cmd = [
 249                     encodeFilename(self.executable, True),
 250                     encodeArgument('-i')]
 251             cmd.append(encodeFilename(self._ffmpeg_filename_argument(path), True))
 252             self.write_debug(f'{self.basename} command line: {shell_quote(cmd)}')
 253             stdout, stderr, returncode = Popen.run(
 254                 cmd, text=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 255             if returncode != (0 if self.probe_available else 1):
 256                 return None
 257         except OSError:
 258             return None
 259         output = stdout if self.probe_available else stderr
 260         if self.probe_available:
 261             audio_codec = None
 262             for line in output.split('\n'):
 263                 if line.startswith('codec_name='):
 264                     audio_codec = line.split('=')[1].strip()
 265                 elif line.strip() == 'codec_type=audio' and audio_codec is not None:
 266                     return audio_codec
 267         else:
 268             # Stream #FILE_INDEX:STREAM_INDEX[STREAM_ID](LANGUAGE): CODEC_TYPE: CODEC_NAME
 269             mobj = re.search(
 270                 r'Stream\s*#\d+:\d+(?:\[0x[0-9a-f]+\])?(?:\([a-z]{3}\))?:\s*Audio:\s*([0-9a-z]+)',
 271                 output)
 272             if mobj:
 273                 return mobj.group(1)
 274         return None
 275
 276     def get_metadata_object(self, path, opts=[]):
 277         if self.probe_basename != 'ffprobe':
 278             if self.probe_available:
 279                 self.report_warning('Only ffprobe is supported for metadata extraction')
 280             raise PostProcessingError('ffprobe not found. Please install or provide the path using --ffmpeg-location')
 281         self.check_version()
 282
 283         cmd = [
 284             encodeFilename(self.probe_executable, True),
 285             encodeArgument('-hide_banner'),
 286             encodeArgument('-show_format'),
 287             encodeArgument('-show_streams'),
 288             encodeArgument('-print_format'),
 289             encodeArgument('json'),
 290         ]
 291
 292         cmd += opts
 293         cmd.append(self._ffmpeg_filename_argument(path))
 294         self.write_debug(f'ffprobe command line: {shell_quote(cmd)}')
 295         stdout, _, _ = Popen.run(cmd, text=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 296         return json.loads(stdout)
 297
 298     def get_stream_number(self, path, keys, value):
 299         streams = self.get_metadata_object(path)['streams']
 300         num = next(
 301             (i for i, stream in enumerate(streams) if traverse_obj(stream, keys, casesense=False) == value),
 302             None)
 303         return num, len(streams)
 304
 305     def _fixup_chapters(self, info):
 306         last_chapter = traverse_obj(info, ('chapters', -1))
 307         if last_chapter and not last_chapter.get('end_time'):
 308             last_chapter['end_time'] = self._get_real_video_duration(info['filepath'])
 309
 310     def _get_real_video_duration(self, filepath, fatal=True):
 311         try:
 312             duration = float_or_none(
 313                 traverse_obj(self.get_metadata_object(filepath), ('format', 'duration')))
 314             if not duration:
 315                 raise PostProcessingError('ffprobe returned empty duration')
 316             return duration
 317         except PostProcessingError as e:
 318             if fatal:
 319                 raise PostProcessingError(f'Unable to determine video duration: {e.msg}')
 320
 321     def _duration_mismatch(self, d1, d2, tolerance=2):
 322         if not d1 or not d2:
 323             return None
 324         # The duration is often only known to nearest second. So there can be <1sec disparity natually.
 325         # Further excuse an additional <1sec difference.
 326         return abs(d1 - d2) > tolerance
 327
 328     def run_ffmpeg_multiple_files(self, input_paths, out_path, opts, **kwargs):
 329         return self.real_run_ffmpeg(
 330             [(path, []) for path in input_paths],
 331             [(out_path, opts)], **kwargs)
 332
 333     def real_run_ffmpeg(self, input_path_opts, output_path_opts, *, expected_retcodes=(0,)):
 334         self.check_version()
 335
 336         oldest_mtime = min(
 337             os.stat(encodeFilename(path)).st_mtime for path, _ in input_path_opts if path)
 338
 339         cmd = [encodeFilename(self.executable, True), encodeArgument('-y')]
 340         # avconv does not have repeat option
 341         if self.basename == 'ffmpeg':
 342             cmd += [encodeArgument('-loglevel'), encodeArgument('repeat+info')]
 343
 344         def make_args(file, args, name, number):
 345             keys = ['_%s%d' % (name, number), '_%s' % name]
 346             if name == 'o':
 347                 args += ['-movflags', '+faststart']
 348                 if number == 1:
 349                     keys.append('')
 350             args += self._configuration_args(self.basename, keys)
 351             if name == 'i':
 352                 args.append('-i')
 353             return (
 354                 [encodeArgument(arg) for arg in args]
 355                 + [encodeFilename(self._ffmpeg_filename_argument(file), True)])
 356
 357         for arg_type, path_opts in (('i', input_path_opts), ('o', output_path_opts)):
 358             cmd += itertools.chain.from_iterable(
 359                 make_args(path, list(opts), arg_type, i + 1)
 360                 for i, (path, opts) in enumerate(path_opts) if path)
 361
 362         self.write_debug('ffmpeg command line: %s' % shell_quote(cmd))
 363         _, stderr, returncode = Popen.run(
 364             cmd, text=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 365         if returncode not in variadic(expected_retcodes):
 366             self.write_debug(stderr)
 367             raise FFmpegPostProcessorError(stderr.strip().splitlines()[-1])
 368         for out_path, _ in output_path_opts:
 369             if out_path:
 370                 self.try_utime(out_path, oldest_mtime, oldest_mtime)
 371         return stderr
 372
 373     def run_ffmpeg(self, path, out_path, opts, **kwargs):
 374         return self.run_ffmpeg_multiple_files([path], out_path, opts, **kwargs)
 375
 376     @staticmethod
 377     def _ffmpeg_filename_argument(fn):
 378         # Always use 'file:' because the filename may contain ':' (ffmpeg
 379         # interprets that as a protocol) or can start with '-' (-- is broken in
 380         # ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
 381         # Also leave '-' intact in order not to break streaming to stdout.
 382         if fn.startswith(('http://', 'https://')):
 383             return fn
 384         return 'file:' + fn if fn != '-' else fn
 385
 386     @staticmethod
 387     def _quote_for_ffmpeg(string):
 388         # See https://ffmpeg.org/ffmpeg-utils.html#toc-Quoting-and-escaping
 389         # A sequence of '' produces '\'''\'';
 390         # final replace removes the empty '' between \' \'.
 391         string = string.replace("'", r"'\''").replace("'''", "'")
 392         # Handle potential ' at string boundaries.
 393         string = string[1:] if string[0] == "'" else "'" + string
 394         return string[:-1] if string[-1] == "'" else string + "'"
 395
 396     def force_keyframes(self, filename, timestamps):
 397         timestamps = orderedSet(timestamps)
 398         if timestamps[0] == 0:
 399             timestamps = timestamps[1:]
 400         keyframe_file = prepend_extension(filename, 'keyframes.temp')
 401         self.to_screen(f'Re-encoding "{filename}" with appropriate keyframes')
 402         self.run_ffmpeg(filename, keyframe_file, [
 403             *self.stream_copy_opts(False, ext=determine_ext(filename)),
 404             '-force_key_frames', ','.join(f'{t:.6f}' for t in timestamps)])
 405         return keyframe_file
 406
 407     def concat_files(self, in_files, out_file, concat_opts=None):
 408         """
 409         Use concat demuxer to concatenate multiple files having identical streams.
 410
 411         Only inpoint, outpoint, and duration concat options are supported.
 412         See https://ffmpeg.org/ffmpeg-formats.html#concat-1 for details
 413         """
 414         concat_file = f'{out_file}.concat'
 415         self.write_debug(f'Writing concat spec to {concat_file}')
 416         with open(concat_file, 'w', encoding='utf-8') as f:
 417             f.writelines(self._concat_spec(in_files, concat_opts))
 418
 419         out_flags = list(self.stream_copy_opts(ext=determine_ext(out_file)))
 420
 421         self.real_run_ffmpeg(
 422             [(concat_file, ['-hide_banner', '-nostdin', '-f', 'concat', '-safe', '0'])],
 423             [(out_file, out_flags)])
 424         self._delete_downloaded_files(concat_file)
 425
 426     @classmethod
 427     def _concat_spec(cls, in_files, concat_opts=None):
 428         if concat_opts is None:
 429             concat_opts = [{}] * len(in_files)
 430         yield 'ffconcat version 1.0\n'
 431         for file, opts in zip(in_files, concat_opts):
 432             yield f'file {cls._quote_for_ffmpeg(cls._ffmpeg_filename_argument(file))}\n'
 433             # Iterate explicitly to yield the following directives in order, ignoring the rest.
 434             for directive in 'inpoint', 'outpoint', 'duration':
 435                 if directive in opts:
 436                     yield f'{directive} {opts[directive]}\n'
 437
 438
 439 class FFmpegExtractAudioPP(FFmpegPostProcessor):
 440     COMMON_AUDIO_EXTS = MEDIA_EXTENSIONS.common_audio + ('wma', )
 441     SUPPORTED_EXTS = tuple(ACODECS.keys())
 442     FORMAT_RE = create_mapping_re(('best', *SUPPORTED_EXTS))
 443
 444     def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
 445         FFmpegPostProcessor.__init__(self, downloader)
 446         self.mapping = preferredcodec or 'best'
 447         self._preferredquality = float_or_none(preferredquality)
 448         self._nopostoverwrites = nopostoverwrites
 449
 450     def _quality_args(self, codec):
 451         if self._preferredquality is None:
 452             return []
 453         elif self._preferredquality > 10:
 454             return ['-b:a', f'{self._preferredquality}k']
 455
 456         limits = {
 457             'libmp3lame': (10, 0),
 458             'libvorbis': (0, 10),
 459             # FFmpeg's AAC encoder does not have an upper limit for the value of -q:a.
 460             # Experimentally, with values over 4, bitrate changes were minimal or non-existent
 461             'aac': (0.1, 4),
 462             'libfdk_aac': (1, 5),
 463         }.get(codec)
 464         if not limits:
 465             return []
 466
 467         q = limits[1] + (limits[0] - limits[1]) * (self._preferredquality / 10)
 468         if codec == 'libfdk_aac':
 469             return ['-vbr', f'{int(q)}']
 470         return ['-q:a', f'{q}']
 471
 472     def run_ffmpeg(self, path, out_path, codec, more_opts):
 473         if codec is None:
 474             acodec_opts = []
 475         else:
 476             acodec_opts = ['-acodec', codec]
 477         opts = ['-vn'] + acodec_opts + more_opts
 478         try:
 479             FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
 480         except FFmpegPostProcessorError as err:
 481             raise PostProcessingError(f'audio conversion failed: {err.msg}')
 482
 483     @PostProcessor._restrict_to(images=False)
 484     def run(self, information):
 485         orig_path = path = information['filepath']
 486         target_format, _skip_msg = resolve_mapping(information['ext'], self.mapping)
 487         if target_format == 'best' and information['ext'] in self.COMMON_AUDIO_EXTS:
 488             target_format, _skip_msg = None, 'the file is already in a common audio format'
 489         if not target_format:
 490             self.to_screen(f'Not converting audio {orig_path}; {_skip_msg}')
 491             return [], information
 492
 493         filecodec = self.get_audio_codec(path)
 494         if filecodec is None:
 495             raise PostProcessingError('WARNING: unable to obtain file audio codec with ffprobe')
 496
 497         if filecodec == 'aac' and target_format in ('m4a', 'best'):
 498             # Lossless, but in another container
 499             extension, _, more_opts, acodec = *ACODECS['m4a'], 'copy'
 500         elif target_format == 'best' or target_format == filecodec:
 501             # Lossless if possible
 502             try:
 503                 extension, _, more_opts, acodec = *ACODECS[filecodec], 'copy'
 504             except KeyError:
 505                 extension, acodec, more_opts = ACODECS['mp3']
 506         else:
 507             # We convert the audio (lossy if codec is lossy)
 508             extension, acodec, more_opts = ACODECS[target_format]
 509             if acodec == 'aac' and self._features.get('fdk'):
 510                 acodec, more_opts = 'libfdk_aac', []
 511
 512         more_opts = list(more_opts)
 513         if acodec != 'copy':
 514             more_opts = self._quality_args(acodec)
 515
 516         temp_path = new_path = replace_extension(path, extension, information['ext'])
 517
 518         if new_path == path:
 519             if acodec == 'copy':
 520                 self.to_screen(f'Not converting audio {orig_path}; file is already in target format {target_format}')
 521                 return [], information
 522             orig_path = prepend_extension(path, 'orig')
 523             temp_path = prepend_extension(path, 'temp')
 524         if (self._nopostoverwrites and os.path.exists(encodeFilename(new_path))
 525                 and os.path.exists(encodeFilename(orig_path))):
 526             self.to_screen('Post-process file %s exists, skipping' % new_path)
 527             return [], information
 528
 529         self.to_screen(f'Destination: {new_path}')
 530         self.run_ffmpeg(path, temp_path, acodec, more_opts)
 531
 532         os.replace(path, orig_path)
 533         os.replace(temp_path, new_path)
 534         information['filepath'] = new_path
 535         information['ext'] = extension
 536
 537         # Try to update the date time for extracted audio file.
 538         if information.get('filetime') is not None:
 539             self.try_utime(
 540                 new_path, time.time(), information['filetime'], errnote='Cannot update utime of audio file')
 541
 542         return [orig_path], information
 543
 544
 545 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 546     SUPPORTED_EXTS = (
 547         *sorted((*MEDIA_EXTENSIONS.common_video, 'gif')),
 548         *sorted((*MEDIA_EXTENSIONS.common_audio, 'aac', 'vorbis')),
 549     )
 550     FORMAT_RE = create_mapping_re(SUPPORTED_EXTS)
 551     _ACTION = 'converting'
 552
 553     def __init__(self, downloader=None, preferedformat=None):
 554         super().__init__(downloader)
 555         self.mapping = preferedformat
 556
 557     @staticmethod
 558     def _options(target_ext):
 559         yield from FFmpegPostProcessor.stream_copy_opts(False)
 560         if target_ext == 'avi':
 561             yield from ('-c:v', 'libxvid', '-vtag', 'XVID')
 562
 563     @PostProcessor._restrict_to(images=False)
 564     def run(self, info):
 565         filename, source_ext = info['filepath'], info['ext'].lower()
 566         target_ext, _skip_msg = resolve_mapping(source_ext, self.mapping)
 567         if _skip_msg:
 568             self.to_screen(f'Not {self._ACTION} media file "{filename}"; {_skip_msg}')
 569             return [], info
 570
 571         outpath = replace_extension(filename, target_ext, source_ext)
 572         self.to_screen(f'{self._ACTION.title()} video from {source_ext} to {target_ext}; Destination: {outpath}')
 573         self.run_ffmpeg(filename, outpath, self._options(target_ext))
 574
 575         info['filepath'] = outpath
 576         info['format'] = info['ext'] = target_ext
 577         return [filename], info
 578
 579
 580 class FFmpegVideoRemuxerPP(FFmpegVideoConvertorPP):
 581     _ACTION = 'remuxing'
 582
 583     @staticmethod
 584     def _options(target_ext):
 585         return FFmpegPostProcessor.stream_copy_opts()
 586
 587
 588 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 589     SUPPORTED_EXTS = ('mp4', 'mov', 'm4a', 'webm', 'mkv', 'mka')
 590
 591     def __init__(self, downloader=None, already_have_subtitle=False):
 592         super().__init__(downloader)
 593         self._already_have_subtitle = already_have_subtitle
 594
 595     @PostProcessor._restrict_to(images=False)
 596     def run(self, info):
 597         if info['ext'] not in self.SUPPORTED_EXTS:
 598             self.to_screen(f'Subtitles can only be embedded in {", ".join(self.SUPPORTED_EXTS)} files')
 599             return [], info
 600         subtitles = info.get('requested_subtitles')
 601         if not subtitles:
 602             self.to_screen('There aren\'t any subtitles to embed')
 603             return [], info
 604
 605         filename = info['filepath']
 606
 607         # Disabled temporarily. There needs to be a way to override this
 608         # in case of duration actually mismatching in extractor
 609         # See: https://github.com/yt-dlp/yt-dlp/issues/1870, https://github.com/yt-dlp/yt-dlp/issues/1385
 610         '''
 611         if info.get('duration') and not info.get('__real_download') and self._duration_mismatch(
 612                 self._get_real_video_duration(filename, False), info['duration']):
 613             self.to_screen(f'Skipping {self.pp_key()} since the real and expected durations mismatch')
 614             return [], info
 615         '''
 616
 617         ext = info['ext']
 618         sub_langs, sub_names, sub_filenames = [], [], []
 619         webm_vtt_warn = False
 620         mp4_ass_warn = False
 621
 622         for lang, sub_info in subtitles.items():
 623             if not os.path.exists(sub_info.get('filepath', '')):
 624                 self.report_warning(f'Skipping embedding {lang} subtitle because the file is missing')
 625                 continue
 626             sub_ext = sub_info['ext']
 627             if sub_ext == 'json':
 628                 self.report_warning('JSON subtitles cannot be embedded')
 629             elif ext != 'webm' or ext == 'webm' and sub_ext == 'vtt':
 630                 sub_langs.append(lang)
 631                 sub_names.append(sub_info.get('name'))
 632                 sub_filenames.append(sub_info['filepath'])
 633             else:
 634                 if not webm_vtt_warn and ext == 'webm' and sub_ext != 'vtt':
 635                     webm_vtt_warn = True
 636                     self.report_warning('Only WebVTT subtitles can be embedded in webm files')
 637             if not mp4_ass_warn and ext == 'mp4' and sub_ext == 'ass':
 638                 mp4_ass_warn = True
 639                 self.report_warning('ASS subtitles cannot be properly embedded in mp4 files; expect issues')
 640
 641         if not sub_langs:
 642             return [], info
 643
 644         input_files = [filename] + sub_filenames
 645
 646         opts = [
 647             *self.stream_copy_opts(ext=info['ext']),
 648             # Don't copy the existing subtitles, we may be running the
 649             # postprocessor a second time
 650             '-map', '-0:s',
 651         ]
 652         for i, (lang, name) in enumerate(zip(sub_langs, sub_names)):
 653             opts.extend(['-map', '%d:0' % (i + 1)])
 654             lang_code = ISO639Utils.short2long(lang) or lang
 655             opts.extend(['-metadata:s:s:%d' % i, 'language=%s' % lang_code])
 656             if name:
 657                 opts.extend(['-metadata:s:s:%d' % i, 'handler_name=%s' % name,
 658                              '-metadata:s:s:%d' % i, 'title=%s' % name])
 659
 660         temp_filename = prepend_extension(filename, 'temp')
 661         self.to_screen('Embedding subtitles in "%s"' % filename)
 662         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
 663         os.replace(temp_filename, filename)
 664
 665         files_to_delete = [] if self._already_have_subtitle else sub_filenames
 666         return files_to_delete, info
 667
 668
 669 class FFmpegMetadataPP(FFmpegPostProcessor):
 670
 671     def __init__(self, downloader, add_metadata=True, add_chapters=True, add_infojson='if_exists'):
 672         FFmpegPostProcessor.__init__(self, downloader)
 673         self._add_metadata = add_metadata
 674         self._add_chapters = add_chapters
 675         self._add_infojson = add_infojson
 676
 677     @staticmethod
 678     def _options(target_ext):
 679         audio_only = target_ext == 'm4a'
 680         yield from FFmpegPostProcessor.stream_copy_opts(not audio_only)
 681         if audio_only:
 682             yield from ('-vn', '-acodec', 'copy')
 683
 684     @PostProcessor._restrict_to(images=False)
 685     def run(self, info):
 686         self._fixup_chapters(info)
 687         filename, metadata_filename = info['filepath'], None
 688         files_to_delete, options = [], []
 689         if self._add_chapters and info.get('chapters'):
 690             metadata_filename = replace_extension(filename, 'meta')
 691             options.extend(self._get_chapter_opts(info['chapters'], metadata_filename))
 692             files_to_delete.append(metadata_filename)
 693         if self._add_metadata:
 694             options.extend(self._get_metadata_opts(info))
 695
 696         if self._add_infojson:
 697             if info['ext'] in ('mkv', 'mka'):
 698                 infojson_filename = info.get('infojson_filename')
 699                 options.extend(self._get_infojson_opts(info, infojson_filename))
 700                 if not infojson_filename:
 701                     files_to_delete.append(info.get('infojson_filename'))
 702             elif self._add_infojson is True:
 703                 self.to_screen('The info-json can only be attached to mkv/mka files')
 704
 705         if not options:
 706             self.to_screen('There isn\'t any metadata to add')
 707             return [], info
 708
 709         temp_filename = prepend_extension(filename, 'temp')
 710         self.to_screen('Adding metadata to "%s"' % filename)
 711         self.run_ffmpeg_multiple_files(
 712             (filename, metadata_filename), temp_filename,
 713             itertools.chain(self._options(info['ext']), *options))
 714         self._delete_downloaded_files(*files_to_delete)
 715         os.replace(temp_filename, filename)
 716         return [], info
 717
 718     @staticmethod
 719     def _get_chapter_opts(chapters, metadata_filename):
 720         with open(metadata_filename, 'w', encoding='utf-8') as f:
 721             def ffmpeg_escape(text):
 722                 return re.sub(r'([\\=;#\n])', r'\\\1', text)
 723
 724             metadata_file_content = ';FFMETADATA1\n'
 725             for chapter in chapters:
 726                 metadata_file_content += '[CHAPTER]\nTIMEBASE=1/1000\n'
 727                 metadata_file_content += 'START=%d\n' % (chapter['start_time'] * 1000)
 728                 metadata_file_content += 'END=%d\n' % (chapter['end_time'] * 1000)
 729                 chapter_title = chapter.get('title')
 730                 if chapter_title:
 731                     metadata_file_content += 'title=%s\n' % ffmpeg_escape(chapter_title)
 732             f.write(metadata_file_content)
 733         yield ('-map_metadata', '1')
 734
 735     def _get_metadata_opts(self, info):
 736         meta_prefix = 'meta'
 737         metadata = collections.defaultdict(dict)
 738
 739         def add(meta_list, info_list=None):
 740             value = next((
 741                 str(info[key]) for key in [f'{meta_prefix}_'] + list(variadic(info_list or meta_list))
 742                 if info.get(key) is not None), None)
 743             if value not in ('', None):
 744                 value = value.replace('\0', '')  # nul character cannot be passed in command line
 745                 metadata['common'].update({meta_f: value for meta_f in variadic(meta_list)})
 746
 747         # Info on media metadata/metadata supported by ffmpeg:
 748         # https://wiki.multimedia.cx/index.php/FFmpeg_Metadata
 749         # https://kdenlive.org/en/project/adding-meta-data-to-mp4-video/
 750         # https://kodi.wiki/view/Video_file_tagging
 751
 752         add('title', ('track', 'title'))
 753         add('date', 'upload_date')
 754         add(('description', 'synopsis'), 'description')
 755         add(('purl', 'comment'), 'webpage_url')
 756         add('track', 'track_number')
 757         add('artist', ('artist', 'creator', 'uploader', 'uploader_id'))
 758         add('genre')
 759         add('album')
 760         add('album_artist')
 761         add('disc', 'disc_number')
 762         add('show', 'series')
 763         add('season_number')
 764         add('episode_id', ('episode', 'episode_id'))
 765         add('episode_sort', 'episode_number')
 766         if 'embed-metadata' in self.get_param('compat_opts', []):
 767             add('comment', 'description')
 768             metadata['common'].pop('synopsis', None)
 769
 770         meta_regex = rf'{re.escape(meta_prefix)}(?P<i>\d+)?_(?P<key>.+)'
 771         for key, value in info.items():
 772             mobj = re.fullmatch(meta_regex, key)
 773             if value is not None and mobj:
 774                 metadata[mobj.group('i') or 'common'][mobj.group('key')] = value.replace('\0', '')
 775
 776         # Write id3v1 metadata also since Windows Explorer can't handle id3v2 tags
 777         yield ('-write_id3v1', '1')
 778
 779         for name, value in metadata['common'].items():
 780             yield ('-metadata', f'{name}={value}')
 781
 782         stream_idx = 0
 783         for fmt in info.get('requested_formats') or []:
 784             stream_count = 2 if 'none' not in (fmt.get('vcodec'), fmt.get('acodec')) else 1
 785             lang = ISO639Utils.short2long(fmt.get('language') or '') or fmt.get('language')
 786             for i in range(stream_idx, stream_idx + stream_count):
 787                 if lang:
 788                     metadata[str(i)].setdefault('language', lang)
 789                 for name, value in metadata[str(i)].items():
 790                     yield (f'-metadata:s:{i}', f'{name}={value}')
 791             stream_idx += stream_count
 792
 793     def _get_infojson_opts(self, info, infofn):
 794         if not infofn or not os.path.exists(infofn):
 795             if self._add_infojson is not True:
 796                 return
 797             infofn = infofn or '%s.temp' % (
 798                 self._downloader.prepare_filename(info, 'infojson')
 799                 or replace_extension(self._downloader.prepare_filename(info), 'info.json', info['ext']))
 800             if not self._downloader._ensure_dir_exists(infofn):
 801                 return
 802             self.write_debug(f'Writing info-json to: {infofn}')
 803             write_json_file(self._downloader.sanitize_info(info, self.get_param('clean_infojson', True)), infofn)
 804             info['infojson_filename'] = infofn
 805
 806         old_stream, new_stream = self.get_stream_number(info['filepath'], ('tags', 'mimetype'), 'application/json')
 807         if old_stream is not None:
 808             yield ('-map', '-0:%d' % old_stream)
 809             new_stream -= 1
 810
 811         yield (
 812             '-attach', infofn,
 813             f'-metadata:s:{new_stream}', 'mimetype=application/json',
 814             f'-metadata:s:{new_stream}', 'filename=info.json',
 815         )
 816
 817
 818 class FFmpegMergerPP(FFmpegPostProcessor):
 819     SUPPORTED_EXTS = MEDIA_EXTENSIONS.common_video
 820
 821     @PostProcessor._restrict_to(images=False)
 822     def run(self, info):
 823         filename = info['filepath']
 824         temp_filename = prepend_extension(filename, 'temp')
 825         args = ['-c', 'copy']
 826         audio_streams = 0
 827         for (i, fmt) in enumerate(info['requested_formats']):
 828             if fmt.get('acodec') != 'none':
 829                 args.extend(['-map', f'{i}:a:0'])
 830                 aac_fixup = fmt['protocol'].startswith('m3u8') and self.get_audio_codec(fmt['filepath']) == 'aac'
 831                 if aac_fixup:
 832                     args.extend([f'-bsf:a:{audio_streams}', 'aac_adtstoasc'])
 833                 audio_streams += 1
 834             if fmt.get('vcodec') != 'none':
 835                 args.extend(['-map', '%u:v:0' % (i)])
 836         self.to_screen('Merging formats into "%s"' % filename)
 837         self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
 838         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 839         return info['__files_to_merge'], info
 840
 841     def can_merge(self):
 842         # TODO: figure out merge-capable ffmpeg version
 843         if self.basename != 'avconv':
 844             return True
 845
 846         required_version = '10-0'
 847         if is_outdated_version(
 848                 self._versions[self.basename], required_version):
 849             warning = ('Your copy of %s is outdated and unable to properly mux separate video and audio files, '
 850                        'yt-dlp will download single file media. '
 851                        'Update %s to version %s or newer to fix this.') % (
 852                            self.basename, self.basename, required_version)
 853             self.report_warning(warning)
 854             return False
 855         return True
 856
 857
 858 class FFmpegFixupPostProcessor(FFmpegPostProcessor):
 859     def _fixup(self, msg, filename, options):
 860         temp_filename = prepend_extension(filename, 'temp')
 861
 862         self.to_screen(f'{msg} of "{filename}"')
 863         self.run_ffmpeg(filename, temp_filename, options)
 864
 865         os.replace(temp_filename, filename)
 866
 867
 868 class FFmpegFixupStretchedPP(FFmpegFixupPostProcessor):
 869     @PostProcessor._restrict_to(images=False, audio=False)
 870     def run(self, info):
 871         stretched_ratio = info.get('stretched_ratio')
 872         if stretched_ratio not in (None, 1):
 873             self._fixup('Fixing aspect ratio', info['filepath'], [
 874                 *self.stream_copy_opts(), '-aspect', '%f' % stretched_ratio])
 875         return [], info
 876
 877
 878 class FFmpegFixupM4aPP(FFmpegFixupPostProcessor):
 879     @PostProcessor._restrict_to(images=False, video=False)
 880     def run(self, info):
 881         if info.get('container') == 'm4a_dash':
 882             self._fixup('Correcting container', info['filepath'], [*self.stream_copy_opts(), '-f', 'mp4'])
 883         return [], info
 884
 885
 886 class FFmpegFixupM3u8PP(FFmpegFixupPostProcessor):
 887     def _needs_fixup(self, info):
 888         yield info['ext'] in ('mp4', 'm4a')
 889         yield info['protocol'].startswith('m3u8')
 890         try:
 891             metadata = self.get_metadata_object(info['filepath'])
 892         except PostProcessingError as e:
 893             self.report_warning(f'Unable to extract metadata: {e.msg}')
 894             yield True
 895         else:
 896             yield traverse_obj(metadata, ('format', 'format_name'), casesense=False) == 'mpegts'
 897
 898     @PostProcessor._restrict_to(images=False)
 899     def run(self, info):
 900         if all(self._needs_fixup(info)):
 901             self._fixup('Fixing MPEG-TS in MP4 container', info['filepath'], [
 902                 *self.stream_copy_opts(), '-f', 'mp4', '-bsf:a', 'aac_adtstoasc'])
 903         return [], info
 904
 905
 906 class FFmpegFixupTimestampPP(FFmpegFixupPostProcessor):
 907
 908     def __init__(self, downloader=None, trim=0.001):
 909         # "trim" should be used when the video contains unintended packets
 910         super().__init__(downloader)
 911         assert isinstance(trim, (int, float))
 912         self.trim = str(trim)
 913
 914     @PostProcessor._restrict_to(images=False)
 915     def run(self, info):
 916         if not self._features.get('setts'):
 917             self.report_warning(
 918                 'A re-encode is needed to fix timestamps in older versions of ffmpeg. '
 919                 'Please install ffmpeg 4.4 or later to fixup without re-encoding')
 920             opts = ['-vf', 'setpts=PTS-STARTPTS']
 921         else:
 922             opts = ['-c', 'copy', '-bsf', 'setts=ts=TS-STARTPTS']
 923         self._fixup('Fixing frame timestamp', info['filepath'], opts + [*self.stream_copy_opts(False), '-ss', self.trim])
 924         return [], info
 925
 926
 927 class FFmpegCopyStreamPP(FFmpegFixupPostProcessor):
 928     MESSAGE = 'Copying stream'
 929
 930     @PostProcessor._restrict_to(images=False)
 931     def run(self, info):
 932         self._fixup(self.MESSAGE, info['filepath'], self.stream_copy_opts())
 933         return [], info
 934
 935
 936 class FFmpegFixupDurationPP(FFmpegCopyStreamPP):
 937     MESSAGE = 'Fixing video duration'
 938
 939
 940 class FFmpegFixupDuplicateMoovPP(FFmpegCopyStreamPP):
 941     MESSAGE = 'Fixing duplicate MOOV atoms'
 942
 943
 944 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 945     SUPPORTED_EXTS = MEDIA_EXTENSIONS.subtitles
 946
 947     def __init__(self, downloader=None, format=None):
 948         super().__init__(downloader)
 949         self.format = format
 950
 951     def run(self, info):
 952         subs = info.get('requested_subtitles')
 953         new_ext = self.format
 954         new_format = new_ext
 955         if new_format == 'vtt':
 956             new_format = 'webvtt'
 957         if subs is None:
 958             self.to_screen('There aren\'t any subtitles to convert')
 959             return [], info
 960         self.to_screen('Converting subtitles')
 961         sub_filenames = []
 962         for lang, sub in subs.items():
 963             if not os.path.exists(sub.get('filepath', '')):
 964                 self.report_warning(f'Skipping embedding {lang} subtitle because the file is missing')
 965                 continue
 966             ext = sub['ext']
 967             if ext == new_ext:
 968                 self.to_screen('Subtitle file for %s is already in the requested format' % new_ext)
 969                 continue
 970             elif ext == 'json':
 971                 self.to_screen(
 972                     'You have requested to convert json subtitles into another format, '
 973                     'which is currently not possible')
 974                 continue
 975             old_file = sub['filepath']
 976             sub_filenames.append(old_file)
 977             new_file = replace_extension(old_file, new_ext)
 978
 979             if ext in ('dfxp', 'ttml', 'tt'):
 980                 self.report_warning(
 981                     'You have requested to convert dfxp (TTML) subtitles into another format, '
 982                     'which results in style information loss')
 983
 984                 dfxp_file = old_file
 985                 srt_file = replace_extension(old_file, 'srt')
 986
 987                 with open(dfxp_file, 'rb') as f:
 988                     srt_data = dfxp2srt(f.read())
 989
 990                 with open(srt_file, 'w', encoding='utf-8') as f:
 991                     f.write(srt_data)
 992                 old_file = srt_file
 993
 994                 subs[lang] = {
 995                     'ext': 'srt',
 996                     'data': srt_data,
 997                     'filepath': srt_file,
 998                 }
 999
1000                 if new_ext == 'srt':
1001                     continue
1002                 else:
1003                     sub_filenames.append(srt_file)
1004
1005             self.run_ffmpeg(old_file, new_file, ['-f', new_format])
1006
1007             with open(new_file, encoding='utf-8') as f:
1008                 subs[lang] = {
1009                     'ext': new_ext,
1010                     'data': f.read(),
1011                     'filepath': new_file,
1012                 }
1013
1014             info['__files_to_move'][new_file] = replace_extension(
1015                 info['__files_to_move'][sub['filepath']], new_ext)
1016
1017         return sub_filenames, info
1018
1019
1020 class FFmpegSplitChaptersPP(FFmpegPostProcessor):
1021     def __init__(self, downloader, force_keyframes=False):
1022         FFmpegPostProcessor.__init__(self, downloader)
1023         self._force_keyframes = force_keyframes
1024
1025     def _prepare_filename(self, number, chapter, info):
1026         info = info.copy()
1027         info.update({
1028             'section_number': number,
1029             'section_title': chapter.get('title'),
1030             'section_start': chapter.get('start_time'),
1031             'section_end': chapter.get('end_time'),
1032         })
1033         return self._downloader.prepare_filename(info, 'chapter')
1034
1035     def _ffmpeg_args_for_chapter(self, number, chapter, info):
1036         destination = self._prepare_filename(number, chapter, info)
1037         if not self._downloader._ensure_dir_exists(encodeFilename(destination)):
1038             return
1039
1040         chapter['filepath'] = destination
1041         self.to_screen('Chapter %03d; Destination: %s' % (number, destination))
1042         return (
1043             destination,
1044             ['-ss', str(chapter['start_time']),
1045              '-t', str(chapter['end_time'] - chapter['start_time'])])
1046
1047     @PostProcessor._restrict_to(images=False)
1048     def run(self, info):
1049         self._fixup_chapters(info)
1050         chapters = info.get('chapters') or []
1051         if not chapters:
1052             self.to_screen('Chapter information is unavailable')
1053             return [], info
1054
1055         in_file = info['filepath']
1056         if self._force_keyframes and len(chapters) > 1:
1057             in_file = self.force_keyframes(in_file, (c['start_time'] for c in chapters))
1058         self.to_screen('Splitting video by chapters; %d chapters found' % len(chapters))
1059         for idx, chapter in enumerate(chapters):
1060             destination, opts = self._ffmpeg_args_for_chapter(idx + 1, chapter, info)
1061             self.real_run_ffmpeg([(in_file, opts)], [(destination, self.stream_copy_opts())])
1062         if in_file != info['filepath']:
1063             self._delete_downloaded_files(in_file, msg=None)
1064         return [], info
1065
1066
1067 class FFmpegThumbnailsConvertorPP(FFmpegPostProcessor):
1068     SUPPORTED_EXTS = MEDIA_EXTENSIONS.thumbnails
1069     FORMAT_RE = create_mapping_re(SUPPORTED_EXTS)
1070
1071     def __init__(self, downloader=None, format=None):
1072         super().__init__(downloader)
1073         self.mapping = format
1074
1075     @classmethod
1076     def is_webp(cls, path):
1077         deprecation_warning(f'{cls.__module__}.{cls.__name__}.is_webp is deprecated')
1078         return imghdr.what(path) == 'webp'
1079
1080     def fixup_webp(self, info, idx=-1):
1081         thumbnail_filename = info['thumbnails'][idx]['filepath']
1082         _, thumbnail_ext = os.path.splitext(thumbnail_filename)
1083         if thumbnail_ext:
1084             if thumbnail_ext.lower() != '.webp' and imghdr.what(thumbnail_filename) == 'webp':
1085                 self.to_screen('Correcting thumbnail "%s" extension to webp' % thumbnail_filename)
1086                 webp_filename = replace_extension(thumbnail_filename, 'webp')
1087                 os.replace(thumbnail_filename, webp_filename)
1088                 info['thumbnails'][idx]['filepath'] = webp_filename
1089                 info['__files_to_move'][webp_filename] = replace_extension(
1090                     info['__files_to_move'].pop(thumbnail_filename), 'webp')
1091
1092     @staticmethod
1093     def _options(target_ext):
1094         yield from ('-update', '1')
1095         if target_ext == 'jpg':
1096             yield from ('-bsf:v', 'mjpeg2jpeg')
1097
1098     def convert_thumbnail(self, thumbnail_filename, target_ext):
1099         thumbnail_conv_filename = replace_extension(thumbnail_filename, target_ext)
1100
1101         self.to_screen(f'Converting thumbnail "{thumbnail_filename}" to {target_ext}')
1102         _, source_ext = os.path.splitext(thumbnail_filename)
1103         self.real_run_ffmpeg(
1104             [(thumbnail_filename, [] if source_ext == '.gif' else ['-f', 'image2', '-pattern_type', 'none'])],
1105             [(thumbnail_conv_filename, self._options(target_ext))])
1106         return thumbnail_conv_filename
1107
1108     def run(self, info):
1109         files_to_delete = []
1110         has_thumbnail = False
1111
1112         for idx, thumbnail_dict in enumerate(info.get('thumbnails') or []):
1113             original_thumbnail = thumbnail_dict.get('filepath')
1114             if not original_thumbnail:
1115                 continue
1116             has_thumbnail = True
1117             self.fixup_webp(info, idx)
1118             original_thumbnail = thumbnail_dict['filepath']  # Path can change during fixup
1119             thumbnail_ext = os.path.splitext(original_thumbnail)[1][1:].lower()
1120             if thumbnail_ext == 'jpeg':
1121                 thumbnail_ext = 'jpg'
1122             target_ext, _skip_msg = resolve_mapping(thumbnail_ext, self.mapping)
1123             if _skip_msg:
1124                 self.to_screen(f'Not converting thumbnail "{original_thumbnail}"; {_skip_msg}')
1125                 continue
1126             thumbnail_dict['filepath'] = self.convert_thumbnail(original_thumbnail, target_ext)
1127             files_to_delete.append(original_thumbnail)
1128             info['__files_to_move'][thumbnail_dict['filepath']] = replace_extension(
1129                 info['__files_to_move'][original_thumbnail], target_ext)
1130
1131         if not has_thumbnail:
1132             self.to_screen('There aren\'t any thumbnails to convert')
1133         return files_to_delete, info
1134
1135
1136 class FFmpegConcatPP(FFmpegPostProcessor):
1137     def __init__(self, downloader, only_multi_video=False):
1138         self._only_multi_video = only_multi_video
1139         super().__init__(downloader)
1140
1141     def _get_codecs(self, file):
1142         codecs = traverse_obj(self.get_metadata_object(file), ('streams', ..., 'codec_name'))
1143         self.write_debug(f'Codecs = {", ".join(codecs)}')
1144         return tuple(codecs)
1145
1146     def concat_files(self, in_files, out_file):
1147         if not self._downloader._ensure_dir_exists(out_file):
1148             return
1149         if len(in_files) == 1:
1150             if os.path.realpath(in_files[0]) != os.path.realpath(out_file):
1151                 self.to_screen(f'Moving "{in_files[0]}" to "{out_file}"')
1152             os.replace(in_files[0], out_file)
1153             return []
1154
1155         if len(set(map(self._get_codecs, in_files))) > 1:
1156             raise PostProcessingError(
1157                 'The files have different streams/codecs and cannot be concatenated. '
1158                 'Either select different formats or --recode-video them to a common format')
1159
1160         self.to_screen(f'Concatenating {len(in_files)} files; Destination: {out_file}')
1161         super().concat_files(in_files, out_file)
1162         return in_files
1163
1164     @PostProcessor._restrict_to(images=False, simulated=False)
1165     def run(self, info):
1166         entries = info.get('entries') or []
1167         if not any(entries) or (self._only_multi_video and info['_type'] != 'multi_video'):
1168             return [], info
1169         elif traverse_obj(entries, (..., lambda k, v: k == 'requested_downloads' and len(v) > 1)):
1170             raise PostProcessingError('Concatenation is not supported when downloading multiple separate formats')
1171
1172         in_files = traverse_obj(entries, (..., 'requested_downloads', 0, 'filepath')) or []
1173         if len(in_files) < len(entries):
1174             raise PostProcessingError('Aborting concatenation because some downloads failed')
1175
1176         exts = traverse_obj(entries, (..., 'requested_downloads', 0, 'ext'), (..., 'ext'))
1177         ie_copy = collections.ChainMap({'ext': exts[0] if len(set(exts)) == 1 else 'mkv'},
1178                                        info, self._downloader._playlist_infodict(info))
1179         out_file = self._downloader.prepare_filename(ie_copy, 'pl_video')
1180
1181         files_to_delete = self.concat_files(in_files, out_file)
1182
1183         info['requested_downloads'] = [{
1184             'filepath': out_file,
1185             'ext': ie_copy['ext'],
1186         }]
1187         return files_to_delete, info