yt_dlp/postprocessor/ffmpeg.py

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