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 AudioConversionError, PostProcessor
  10 from ..compat import compat_str
  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     float_or_none,
  22     is_outdated_version,
  23     orderedSet,
  24     prepend_extension,
  25     replace_extension,
  26     shell_quote,
  27     traverse_obj,
  28     variadic,
  29     write_json_file,
  30 )
  31
  32 EXT_TO_OUT_FORMATS = {
  33     'aac': 'adts',
  34     'flac': 'flac',
  35     'm4a': 'ipod',
  36     'mka': 'matroska',
  37     'mkv': 'matroska',
  38     'mpg': 'mpeg',
  39     'ogv': 'ogg',
  40     'ts': 'mpegts',
  41     'wma': 'asf',
  42     'wmv': 'asf',
  43     'vtt': 'webvtt',
  44 }
  45 ACODECS = {
  46     'mp3': 'libmp3lame',
  47     'aac': 'aac',
  48     'flac': 'flac',
  49     'm4a': 'aac',
  50     'opus': 'libopus',
  51     'vorbis': 'libvorbis',
  52     'wav': None,
  53     'alac': None,
  54 }
  55
  56
  57 class FFmpegPostProcessorError(PostProcessingError):
  58     pass
  59
  60
  61 class FFmpegPostProcessor(PostProcessor):
  62     def __init__(self, downloader=None):
  63         PostProcessor.__init__(self, downloader)
  64         self._determine_executables()
  65
  66     def check_version(self):
  67         if not self.available:
  68             raise FFmpegPostProcessorError('ffmpeg not found. Please install or provide the path using --ffmpeg-location')
  69
  70         required_version = '10-0' if self.basename == 'avconv' else '1.0'
  71         if is_outdated_version(self._versions[self.basename], required_version):
  72             self.report_warning(f'Your copy of {self.basename} is outdated, update {self.basename} '
  73                                 f'to version {required_version} or newer if you encounter any errors')
  74
  75     @staticmethod
  76     def get_versions_and_features(downloader=None):
  77         pp = FFmpegPostProcessor(downloader)
  78         return pp._versions, pp._features
  79
  80     @staticmethod
  81     def get_versions(downloader=None):
  82         return FFmpegPostProcessor.get_versions_and_features(downloader)[0]
  83
  84     _version_cache, _features_cache = {}, {}
  85
  86     def _determine_executables(self):
  87         programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe']
  88
  89         def get_ffmpeg_version(path, prog):
  90             if path in self._version_cache:
  91                 self._versions[prog], self._features = self._version_cache[path], self._features_cache.get(path, {})
  92                 return
  93             out = _get_exe_version_output(path, ['-bsfs'], to_screen=self.write_debug)
  94             ver = detect_exe_version(out) if out else False
  95             if ver:
  96                 regexs = [
  97                     r'(?:\d+:)?([0-9.]+)-[0-9]+ubuntu[0-9.]+$',  # Ubuntu, see [1]
  98                     r'n([0-9.]+)$',  # Arch Linux
  99                     # 1. http://www.ducea.com/2006/06/17/ubuntu-package-version-naming-explanation/
 100                 ]
 101                 for regex in regexs:
 102                     mobj = re.match(regex, ver)
 103                     if mobj:
 104                         ver = mobj.group(1)
 105             self._versions[prog] = self._version_cache[path] = ver
 106             if prog != 'ffmpeg' or not out:
 107                 return
 108
 109             mobj = re.search(r'(?m)^\s+libavformat\s+(?:[0-9. ]+)\s+/\s+(?P<runtime>[0-9. ]+)', out)
 110             lavf_runtime_version = mobj.group('runtime').replace(' ', '') if mobj else None
 111             self._features = self._features_cache[path] = {
 112                 'fdk': '--enable-libfdk-aac' in out,
 113                 'setts': 'setts' in out.splitlines(),
 114                 'needs_adtstoasc': is_outdated_version(lavf_runtime_version, '57.56.100', False),
 115             }
 116
 117         self.basename = None
 118         self.probe_basename = None
 119         self._paths = None
 120         self._versions = None
 121         self._features = {}
 122
 123         prefer_ffmpeg = self.get_param('prefer_ffmpeg', True)
 124         location = self.get_param('ffmpeg_location')
 125         if location is None:
 126             self._paths = {p: p for p in programs}
 127         else:
 128             if not os.path.exists(location):
 129                 self.report_warning(
 130                     'ffmpeg-location %s does not exist! '
 131                     'Continuing without ffmpeg.' % (location))
 132                 self._versions = {}
 133                 return
 134             elif os.path.isdir(location):
 135                 dirname, basename = location, None
 136             else:
 137                 basename = os.path.splitext(os.path.basename(location))[0]
 138                 basename = next((p for p in programs if basename.startswith(p)), 'ffmpeg')
 139                 dirname = os.path.dirname(os.path.abspath(location))
 140                 if basename in ('ffmpeg', 'ffprobe'):
 141                     prefer_ffmpeg = True
 142
 143             self._paths = {
 144                 p: os.path.join(dirname, p) for p in programs}
 145             if basename:
 146                 self._paths[basename] = location
 147
 148         self._versions = {}
 149         executables = {'basename': ('ffmpeg', 'avconv'), 'probe_basename': ('ffprobe', 'avprobe')}
 150         if prefer_ffmpeg is False:
 151             executables = {k: v[::-1] for k, v in executables.items()}
 152         for var, prefs in executables.items():
 153             for p in prefs:
 154                 get_ffmpeg_version(self._paths[p], p)
 155                 if self._versions[p]:
 156                     setattr(self, var, p)
 157                     break
 158
 159         if self.basename == 'avconv':
 160             self.deprecation_warning(
 161                 'Support for avconv is deprecated and may be removed in a future version. Use ffmpeg instead')
 162         if self.probe_basename == 'avprobe':
 163             self.deprecation_warning(
 164                 'Support for avprobe is deprecated and may be removed in a future version. Use ffprobe instead')
 165
 166     @property
 167     def available(self):
 168         return self.basename is not None
 169
 170     @property
 171     def executable(self):
 172         return self._paths[self.basename]
 173
 174     @property
 175     def probe_available(self):
 176         return self.probe_basename is not None
 177
 178     @property
 179     def probe_executable(self):
 180         return self._paths[self.probe_basename]
 181
 182     @staticmethod
 183     def stream_copy_opts(copy=True, *, ext=None):
 184         yield from ('-map', '0')
 185         # Don't copy Apple TV chapters track, bin_data
 186         # See https://github.com/yt-dlp/yt-dlp/issues/2, #19042, #19024, https://trac.ffmpeg.org/ticket/6016
 187         yield from ('-dn', '-ignore_unknown')
 188         if copy:
 189             yield from ('-c', 'copy')
 190         if ext in ('mp4', 'mov', 'm4a'):
 191             yield from ('-c:s', 'mov_text')
 192
 193     def get_audio_codec(self, path):
 194         if not self.probe_available and not self.available:
 195             raise PostProcessingError('ffprobe and ffmpeg not found. Please install or provide the path using --ffmpeg-location')
 196         try:
 197             if self.probe_available:
 198                 cmd = [
 199                     encodeFilename(self.probe_executable, True),
 200                     encodeArgument('-show_streams')]
 201             else:
 202                 cmd = [
 203                     encodeFilename(self.executable, True),
 204                     encodeArgument('-i')]
 205             cmd.append(encodeFilename(self._ffmpeg_filename_argument(path), True))
 206             self.write_debug(f'{self.basename} command line: {shell_quote(cmd)}')
 207             handle = Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 208             stdout_data, stderr_data = handle.communicate_or_kill()
 209             expected_ret = 0 if self.probe_available else 1
 210             if handle.wait() != expected_ret:
 211                 return None
 212         except OSError:
 213             return None
 214         output = (stdout_data if self.probe_available else stderr_data).decode('ascii', 'ignore')
 215         if self.probe_available:
 216             audio_codec = None
 217             for line in output.split('\n'):
 218                 if line.startswith('codec_name='):
 219                     audio_codec = line.split('=')[1].strip()
 220                 elif line.strip() == 'codec_type=audio' and audio_codec is not None:
 221                     return audio_codec
 222         else:
 223             # Stream #FILE_INDEX:STREAM_INDEX[STREAM_ID](LANGUAGE): CODEC_TYPE: CODEC_NAME
 224             mobj = re.search(
 225                 r'Stream\s*#\d+:\d+(?:\[0x[0-9a-f]+\])?(?:\([a-z]{3}\))?:\s*Audio:\s*([0-9a-z]+)',
 226                 output)
 227             if mobj:
 228                 return mobj.group(1)
 229         return None
 230
 231     def get_metadata_object(self, path, opts=[]):
 232         if self.probe_basename != 'ffprobe':
 233             if self.probe_available:
 234                 self.report_warning('Only ffprobe is supported for metadata extraction')
 235             raise PostProcessingError('ffprobe not found. Please install or provide the path using --ffmpeg-location')
 236         self.check_version()
 237
 238         cmd = [
 239             encodeFilename(self.probe_executable, True),
 240             encodeArgument('-hide_banner'),
 241             encodeArgument('-show_format'),
 242             encodeArgument('-show_streams'),
 243             encodeArgument('-print_format'),
 244             encodeArgument('json'),
 245         ]
 246
 247         cmd += opts
 248         cmd.append(encodeFilename(self._ffmpeg_filename_argument(path), True))
 249         self.write_debug('ffprobe command line: %s' % shell_quote(cmd))
 250         p = Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 251         stdout, stderr = p.communicate()
 252         return json.loads(stdout.decode('utf-8', 'replace'))
 253
 254     def get_stream_number(self, path, keys, value):
 255         streams = self.get_metadata_object(path)['streams']
 256         num = next(
 257             (i for i, stream in enumerate(streams) if traverse_obj(stream, keys, casesense=False) == value),
 258             None)
 259         return num, len(streams)
 260
 261     def _get_real_video_duration(self, filepath, fatal=True):
 262         try:
 263             duration = float_or_none(
 264                 traverse_obj(self.get_metadata_object(filepath), ('format', 'duration')))
 265             if not duration:
 266                 raise PostProcessingError('ffprobe returned empty duration')
 267             return duration
 268         except PostProcessingError as e:
 269             if fatal:
 270                 raise PostProcessingError(f'Unable to determine video duration: {e.msg}')
 271
 272     def _duration_mismatch(self, d1, d2):
 273         if not d1 or not d2:
 274             return None
 275         # The duration is often only known to nearest second. So there can be <1sec disparity natually.
 276         # Further excuse an additional <1sec difference.
 277         return abs(d1 - d2) > 2
 278
 279     def run_ffmpeg_multiple_files(self, input_paths, out_path, opts, **kwargs):
 280         return self.real_run_ffmpeg(
 281             [(path, []) for path in input_paths],
 282             [(out_path, opts)], **kwargs)
 283
 284     def real_run_ffmpeg(self, input_path_opts, output_path_opts, *, expected_retcodes=(0,)):
 285         self.check_version()
 286
 287         oldest_mtime = min(
 288             os.stat(encodeFilename(path)).st_mtime for path, _ in input_path_opts if path)
 289
 290         cmd = [encodeFilename(self.executable, True), encodeArgument('-y')]
 291         # avconv does not have repeat option
 292         if self.basename == 'ffmpeg':
 293             cmd += [encodeArgument('-loglevel'), encodeArgument('repeat+info')]
 294
 295         def make_args(file, args, name, number):
 296             keys = ['_%s%d' % (name, number), '_%s' % name]
 297             if name == 'o':
 298                 args += ['-movflags', '+faststart']
 299                 if number == 1:
 300                     keys.append('')
 301             args += self._configuration_args(self.basename, keys)
 302             if name == 'i':
 303                 args.append('-i')
 304             return (
 305                 [encodeArgument(arg) for arg in args]
 306                 + [encodeFilename(self._ffmpeg_filename_argument(file), True)])
 307
 308         for arg_type, path_opts in (('i', input_path_opts), ('o', output_path_opts)):
 309             cmd += itertools.chain.from_iterable(
 310                 make_args(path, list(opts), arg_type, i + 1)
 311                 for i, (path, opts) in enumerate(path_opts) if path)
 312
 313         self.write_debug('ffmpeg command line: %s' % shell_quote(cmd))
 314         p = Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 315         stdout, stderr = p.communicate_or_kill()
 316         if p.returncode not in variadic(expected_retcodes):
 317             stderr = stderr.decode('utf-8', 'replace').strip()
 318             self.write_debug(stderr)
 319             raise FFmpegPostProcessorError(stderr.split('\n')[-1])
 320         for out_path, _ in output_path_opts:
 321             if out_path:
 322                 self.try_utime(out_path, oldest_mtime, oldest_mtime)
 323         return stderr.decode('utf-8', 'replace')
 324
 325     def run_ffmpeg(self, path, out_path, opts, **kwargs):
 326         return self.run_ffmpeg_multiple_files([path], out_path, opts, **kwargs)
 327
 328     @staticmethod
 329     def _ffmpeg_filename_argument(fn):
 330         # Always use 'file:' because the filename may contain ':' (ffmpeg
 331         # interprets that as a protocol) or can start with '-' (-- is broken in
 332         # ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
 333         # Also leave '-' intact in order not to break streaming to stdout.
 334         if fn.startswith(('http://', 'https://')):
 335             return fn
 336         return 'file:' + fn if fn != '-' else fn
 337
 338     @staticmethod
 339     def _quote_for_ffmpeg(string):
 340         # See https://ffmpeg.org/ffmpeg-utils.html#toc-Quoting-and-escaping
 341         # A sequence of '' produces '\'''\'';
 342         # final replace removes the empty '' between \' \'.
 343         string = string.replace("'", r"'\''").replace("'''", "'")
 344         # Handle potential ' at string boundaries.
 345         string = string[1:] if string[0] == "'" else "'" + string
 346         return string[:-1] if string[-1] == "'" else string + "'"
 347
 348     def force_keyframes(self, filename, timestamps):
 349         timestamps = orderedSet(timestamps)
 350         if timestamps[0] == 0:
 351             timestamps = timestamps[1:]
 352         keyframe_file = prepend_extension(filename, 'keyframes.temp')
 353         self.to_screen(f'Re-encoding "{filename}" with appropriate keyframes')
 354         self.run_ffmpeg(filename, keyframe_file, [
 355             *self.stream_copy_opts(False, ext=determine_ext(filename)),
 356             '-force_key_frames', ','.join(f'{t:.6f}' for t in timestamps)])
 357         return keyframe_file
 358
 359     def concat_files(self, in_files, out_file, concat_opts=None):
 360         """
 361         Use concat demuxer to concatenate multiple files having identical streams.
 362
 363         Only inpoint, outpoint, and duration concat options are supported.
 364         See https://ffmpeg.org/ffmpeg-formats.html#concat-1 for details
 365         """
 366         concat_file = f'{out_file}.concat'
 367         self.write_debug(f'Writing concat spec to {concat_file}')
 368         with open(concat_file, 'wt', encoding='utf-8') as f:
 369             f.writelines(self._concat_spec(in_files, concat_opts))
 370
 371         out_flags = list(self.stream_copy_opts(ext=determine_ext(out_file)))
 372
 373         self.real_run_ffmpeg(
 374             [(concat_file, ['-hide_banner', '-nostdin', '-f', 'concat', '-safe', '0'])],
 375             [(out_file, out_flags)])
 376         os.remove(concat_file)
 377
 378     @classmethod
 379     def _concat_spec(cls, in_files, concat_opts=None):
 380         if concat_opts is None:
 381             concat_opts = [{}] * len(in_files)
 382         yield 'ffconcat version 1.0\n'
 383         for file, opts in zip(in_files, concat_opts):
 384             yield f'file {cls._quote_for_ffmpeg(cls._ffmpeg_filename_argument(file))}\n'
 385             # Iterate explicitly to yield the following directives in order, ignoring the rest.
 386             for directive in 'inpoint', 'outpoint', 'duration':
 387                 if directive in opts:
 388                     yield f'{directive} {opts[directive]}\n'
 389
 390
 391 class FFmpegExtractAudioPP(FFmpegPostProcessor):
 392     COMMON_AUDIO_EXTS = ('wav', 'flac', 'm4a', 'aiff', 'mp3', 'ogg', 'mka', 'opus', 'wma')
 393     SUPPORTED_EXTS = ('aac', 'flac', 'mp3', 'm4a', 'opus', 'vorbis', 'wav', 'alac')
 394
 395     def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
 396         FFmpegPostProcessor.__init__(self, downloader)
 397         self._preferredcodec = preferredcodec or 'best'
 398         self._preferredquality = float_or_none(preferredquality)
 399         self._nopostoverwrites = nopostoverwrites
 400
 401     def _quality_args(self, codec):
 402         if self._preferredquality is None:
 403             return []
 404         elif self._preferredquality > 10:
 405             return ['-b:a', f'{self._preferredquality}k']
 406
 407         limits = {
 408             'libmp3lame': (10, 0),
 409             'libvorbis': (0, 10),
 410             # FFmpeg's AAC encoder does not have an upper limit for the value of -q:a.
 411             # Experimentally, with values over 4, bitrate changes were minimal or non-existent
 412             'aac': (0.1, 4),
 413             'libfdk_aac': (1, 5),
 414         }.get(codec)
 415         if not limits:
 416             return []
 417
 418         q = limits[1] + (limits[0] - limits[1]) * (self._preferredquality / 10)
 419         if codec == 'libfdk_aac':
 420             return ['-vbr', f'{int(q)}']
 421         return ['-q:a', f'{q}']
 422
 423     def run_ffmpeg(self, path, out_path, codec, more_opts):
 424         if codec is None:
 425             acodec_opts = []
 426         else:
 427             acodec_opts = ['-acodec', codec]
 428         opts = ['-vn'] + acodec_opts + more_opts
 429         try:
 430             FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
 431         except FFmpegPostProcessorError as err:
 432             raise AudioConversionError(err.msg)
 433
 434     @PostProcessor._restrict_to(images=False)
 435     def run(self, information):
 436         orig_path = path = information['filepath']
 437         orig_ext = information['ext']
 438
 439         if self._preferredcodec == 'best' and orig_ext in self.COMMON_AUDIO_EXTS:
 440             self.to_screen('Skipping audio extraction since the file is already in a common audio format')
 441             return [], information
 442
 443         filecodec = self.get_audio_codec(path)
 444         if filecodec is None:
 445             raise PostProcessingError('WARNING: unable to obtain file audio codec with ffprobe')
 446
 447         more_opts = []
 448         if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
 449             if filecodec == 'aac' and self._preferredcodec in ['m4a', 'best']:
 450                 # Lossless, but in another container
 451                 acodec = 'copy'
 452                 extension = 'm4a'
 453                 more_opts = ['-bsf:a', 'aac_adtstoasc']
 454             elif filecodec in ['aac', 'flac', 'mp3', 'vorbis', 'opus']:
 455                 # Lossless if possible
 456                 acodec = 'copy'
 457                 extension = filecodec
 458                 if filecodec == 'aac':
 459                     more_opts = ['-f', 'adts']
 460                 if filecodec == 'vorbis':
 461                     extension = 'ogg'
 462             elif filecodec == 'alac':
 463                 acodec = None
 464                 extension = 'm4a'
 465                 more_opts += ['-acodec', 'alac']
 466             else:
 467                 # MP3 otherwise.
 468                 acodec = 'libmp3lame'
 469                 extension = 'mp3'
 470                 more_opts = self._quality_args(acodec)
 471         else:
 472             # We convert the audio (lossy if codec is lossy)
 473             acodec = ACODECS[self._preferredcodec]
 474             if acodec == 'aac' and self._features.get('fdk'):
 475                 acodec = 'libfdk_aac'
 476             extension = self._preferredcodec
 477             more_opts = self._quality_args(acodec)
 478             if self._preferredcodec == 'aac':
 479                 more_opts += ['-f', 'adts']
 480             elif self._preferredcodec == 'm4a':
 481                 more_opts += ['-bsf:a', 'aac_adtstoasc']
 482             elif self._preferredcodec == 'vorbis':
 483                 extension = 'ogg'
 484             elif self._preferredcodec == 'wav':
 485                 extension = 'wav'
 486                 more_opts += ['-f', 'wav']
 487             elif self._preferredcodec == 'alac':
 488                 extension = 'm4a'
 489                 more_opts += ['-acodec', 'alac']
 490
 491         prefix, sep, ext = path.rpartition('.')  # not os.path.splitext, since the latter does not work on unicode in all setups
 492         temp_path = new_path = prefix + sep + extension
 493
 494         if new_path == path:
 495             if acodec == 'copy':
 496                 self.to_screen(f'File is already in target format {self._preferredcodec}, skipping')
 497                 return [], information
 498             orig_path = prepend_extension(path, 'orig')
 499             temp_path = prepend_extension(path, 'temp')
 500         if (self._nopostoverwrites and os.path.exists(encodeFilename(new_path))
 501                 and os.path.exists(encodeFilename(orig_path))):
 502             self.to_screen('Post-process file %s exists, skipping' % new_path)
 503             return [], information
 504
 505         try:
 506             self.to_screen(f'Destination: {new_path}')
 507             self.run_ffmpeg(path, temp_path, acodec, more_opts)
 508         except AudioConversionError as e:
 509             raise PostProcessingError(
 510                 'audio conversion failed: ' + e.msg)
 511         except Exception:
 512             raise PostProcessingError('error running ' + self.basename)
 513
 514         os.replace(path, orig_path)
 515         os.replace(temp_path, new_path)
 516         information['filepath'] = new_path
 517         information['ext'] = extension
 518
 519         # Try to update the date time for extracted audio file.
 520         if information.get('filetime') is not None:
 521             self.try_utime(
 522                 new_path, time.time(), information['filetime'],
 523                 errnote='Cannot update utime of audio file')
 524
 525         return [orig_path], information
 526
 527
 528 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 529     SUPPORTED_EXTS = ('mp4', 'mkv', 'flv', 'webm', 'mov', 'avi', 'mka', 'ogg', *FFmpegExtractAudioPP.SUPPORTED_EXTS)
 530     FORMAT_RE = re.compile(r'{0}(?:/{0})*$'.format(r'(?:\w+>)?(?:%s)' % '|'.join(SUPPORTED_EXTS)))
 531     _ACTION = 'converting'
 532
 533     def __init__(self, downloader=None, preferedformat=None):
 534         super().__init__(downloader)
 535         self._preferedformats = preferedformat.lower().split('/')
 536
 537     def _target_ext(self, source_ext):
 538         for pair in self._preferedformats:
 539             kv = pair.split('>')
 540             if len(kv) == 1 or kv[0].strip() == source_ext:
 541                 return kv[-1].strip()
 542
 543     @staticmethod
 544     def _options(target_ext):
 545         yield from FFmpegPostProcessor.stream_copy_opts(False)
 546         if target_ext == 'avi':
 547             yield from ('-c:v', 'libxvid', '-vtag', 'XVID')
 548
 549     @PostProcessor._restrict_to(images=False)
 550     def run(self, info):
 551         filename, source_ext = info['filepath'], info['ext'].lower()
 552         target_ext = self._target_ext(source_ext)
 553         _skip_msg = (
 554             f'could not find a mapping for {source_ext}' if not target_ext
 555             else f'already is in target format {source_ext}' if source_ext == target_ext
 556             else None)
 557         if _skip_msg:
 558             self.to_screen(f'Not {self._ACTION} media file "{filename}"; {_skip_msg}')
 559             return [], info
 560
 561         outpath = replace_extension(filename, target_ext, source_ext)
 562         self.to_screen(f'{self._ACTION.title()} video from {source_ext} to {target_ext}; Destination: {outpath}')
 563         self.run_ffmpeg(filename, outpath, self._options(target_ext))
 564
 565         info['filepath'] = outpath
 566         info['format'] = info['ext'] = target_ext
 567         return [filename], info
 568
 569
 570 class FFmpegVideoRemuxerPP(FFmpegVideoConvertorPP):
 571     _ACTION = 'remuxing'
 572
 573     @staticmethod
 574     def _options(target_ext):
 575         return FFmpegPostProcessor.stream_copy_opts()
 576
 577
 578 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 579     SUPPORTED_EXTS = ('mp4', 'mov', 'm4a', 'webm', 'mkv', 'mka')
 580
 581     def __init__(self, downloader=None, already_have_subtitle=False):
 582         super().__init__(downloader)
 583         self._already_have_subtitle = already_have_subtitle
 584
 585     @PostProcessor._restrict_to(images=False)
 586     def run(self, info):
 587         if info['ext'] not in self.SUPPORTED_EXTS:
 588             self.to_screen(f'Subtitles can only be embedded in {", ".join(self.SUPPORTED_EXTS)} files')
 589             return [], info
 590         subtitles = info.get('requested_subtitles')
 591         if not subtitles:
 592             self.to_screen('There aren\'t any subtitles to embed')
 593             return [], info
 594
 595         filename = info['filepath']
 596
 597         # Disabled temporarily. There needs to be a way to overide this
 598         # in case of duration actually mismatching in extractor
 599         # See: https://github.com/yt-dlp/yt-dlp/issues/1870, https://github.com/yt-dlp/yt-dlp/issues/1385
 600         '''
 601         if info.get('duration') and not info.get('__real_download') and self._duration_mismatch(
 602                 self._get_real_video_duration(filename, False), info['duration']):
 603             self.to_screen(f'Skipping {self.pp_key()} since the real and expected durations mismatch')
 604             return [], info
 605         '''
 606
 607         ext = info['ext']
 608         sub_langs, sub_names, sub_filenames = [], [], []
 609         webm_vtt_warn = False
 610         mp4_ass_warn = False
 611
 612         for lang, sub_info in subtitles.items():
 613             if not os.path.exists(sub_info.get('filepath', '')):
 614                 self.report_warning(f'Skipping embedding {lang} subtitle because the file is missing')
 615                 continue
 616             sub_ext = sub_info['ext']
 617             if sub_ext == 'json':
 618                 self.report_warning('JSON subtitles cannot be embedded')
 619             elif ext != 'webm' or ext == 'webm' and sub_ext == 'vtt':
 620                 sub_langs.append(lang)
 621                 sub_names.append(sub_info.get('name'))
 622                 sub_filenames.append(sub_info['filepath'])
 623             else:
 624                 if not webm_vtt_warn and ext == 'webm' and sub_ext != 'vtt':
 625                     webm_vtt_warn = True
 626                     self.report_warning('Only WebVTT subtitles can be embedded in webm files')
 627             if not mp4_ass_warn and ext == 'mp4' and sub_ext == 'ass':
 628                 mp4_ass_warn = True
 629                 self.report_warning('ASS subtitles cannot be properly embedded in mp4 files; expect issues')
 630
 631         if not sub_langs:
 632             return [], info
 633
 634         input_files = [filename] + sub_filenames
 635
 636         opts = [
 637             *self.stream_copy_opts(ext=info['ext']),
 638             # Don't copy the existing subtitles, we may be running the
 639             # postprocessor a second time
 640             '-map', '-0:s',
 641         ]
 642         for i, (lang, name) in enumerate(zip(sub_langs, sub_names)):
 643             opts.extend(['-map', '%d:0' % (i + 1)])
 644             lang_code = ISO639Utils.short2long(lang) or lang
 645             opts.extend(['-metadata:s:s:%d' % i, 'language=%s' % lang_code])
 646             if name:
 647                 opts.extend(['-metadata:s:s:%d' % i, 'handler_name=%s' % name,
 648                              '-metadata:s:s:%d' % i, 'title=%s' % name])
 649
 650         temp_filename = prepend_extension(filename, 'temp')
 651         self.to_screen('Embedding subtitles in "%s"' % filename)
 652         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
 653         os.replace(temp_filename, filename)
 654
 655         files_to_delete = [] if self._already_have_subtitle else sub_filenames
 656         return files_to_delete, info
 657
 658
 659 class FFmpegMetadataPP(FFmpegPostProcessor):
 660
 661     def __init__(self, downloader, add_metadata=True, add_chapters=True, add_infojson='if_exists'):
 662         FFmpegPostProcessor.__init__(self, downloader)
 663         self._add_metadata = add_metadata
 664         self._add_chapters = add_chapters
 665         self._add_infojson = add_infojson
 666
 667     @staticmethod
 668     def _options(target_ext):
 669         audio_only = target_ext == 'm4a'
 670         yield from FFmpegPostProcessor.stream_copy_opts(not audio_only)
 671         if audio_only:
 672             yield from ('-vn', '-acodec', 'copy')
 673
 674     @PostProcessor._restrict_to(images=False)
 675     def run(self, info):
 676         filename, metadata_filename = info['filepath'], None
 677         files_to_delete, options = [], []
 678         if self._add_chapters and info.get('chapters'):
 679             metadata_filename = replace_extension(filename, 'meta')
 680             options.extend(self._get_chapter_opts(info['chapters'], metadata_filename))
 681             files_to_delete.append(metadata_filename)
 682         if self._add_metadata:
 683             options.extend(self._get_metadata_opts(info))
 684
 685         if self._add_infojson:
 686             if info['ext'] in ('mkv', 'mka'):
 687                 infojson_filename = info.get('infojson_filename')
 688                 options.extend(self._get_infojson_opts(info, infojson_filename))
 689                 if not infojson_filename:
 690                     files_to_delete.append(info.get('infojson_filename'))
 691             elif self._add_infojson is True:
 692                 self.to_screen('The info-json can only be attached to mkv/mka files')
 693
 694         if not options:
 695             self.to_screen('There isn\'t any metadata to add')
 696             return [], info
 697
 698         temp_filename = prepend_extension(filename, 'temp')
 699         self.to_screen('Adding metadata to "%s"' % filename)
 700         self.run_ffmpeg_multiple_files(
 701             (filename, metadata_filename), temp_filename,
 702             itertools.chain(self._options(info['ext']), *options))
 703         for file in filter(None, files_to_delete):
 704             os.remove(file)  # Don't obey --keep-files
 705         os.replace(temp_filename, filename)
 706         return [], info
 707
 708     @staticmethod
 709     def _get_chapter_opts(chapters, metadata_filename):
 710         with open(metadata_filename, 'wt', encoding='utf-8') as f:
 711             def ffmpeg_escape(text):
 712                 return re.sub(r'([\\=;#\n])', r'\\\1', text)
 713
 714             metadata_file_content = ';FFMETADATA1\n'
 715             for chapter in chapters:
 716                 metadata_file_content += '[CHAPTER]\nTIMEBASE=1/1000\n'
 717                 metadata_file_content += 'START=%d\n' % (chapter['start_time'] * 1000)
 718                 metadata_file_content += 'END=%d\n' % (chapter['end_time'] * 1000)
 719                 chapter_title = chapter.get('title')
 720                 if chapter_title:
 721                     metadata_file_content += 'title=%s\n' % ffmpeg_escape(chapter_title)
 722             f.write(metadata_file_content)
 723         yield ('-map_metadata', '1')
 724
 725     def _get_metadata_opts(self, info):
 726         meta_prefix = 'meta'
 727         metadata = collections.defaultdict(dict)
 728
 729         def add(meta_list, info_list=None):
 730             value = next((
 731                 str(info[key]) for key in [f'{meta_prefix}_'] + list(variadic(info_list or meta_list))
 732                 if info.get(key) is not None), None)
 733             if value not in ('', None):
 734                 value = value.replace('\0', '')  # nul character cannot be passed in command line
 735                 metadata['common'].update({meta_f: value for meta_f in variadic(meta_list)})
 736
 737         # See [1-4] for some info on media metadata/metadata supported
 738         # by ffmpeg.
 739         # 1. https://kdenlive.org/en/project/adding-meta-data-to-mp4-video/
 740         # 2. https://wiki.multimedia.cx/index.php/FFmpeg_Metadata
 741         # 3. https://kodi.wiki/view/Video_file_tagging
 742
 743         add('title', ('track', 'title'))
 744         add('date', 'upload_date')
 745         add(('description', 'synopsis'), 'description')
 746         add(('purl', 'comment'), 'webpage_url')
 747         add('track', 'track_number')
 748         add('artist', ('artist', 'creator', 'uploader', 'uploader_id'))
 749         add('genre')
 750         add('album')
 751         add('album_artist')
 752         add('disc', 'disc_number')
 753         add('show', 'series')
 754         add('season_number')
 755         add('episode_id', ('episode', 'episode_id'))
 756         add('episode_sort', 'episode_number')
 757         if 'embed-metadata' in self.get_param('compat_opts', []):
 758             add('comment', 'description')
 759             metadata['common'].pop('synopsis', None)
 760
 761         meta_regex = rf'{re.escape(meta_prefix)}(?P<i>\d+)?_(?P<key>.+)'
 762         for key, value in info.items():
 763             mobj = re.fullmatch(meta_regex, key)
 764             if value is not None and mobj:
 765                 metadata[mobj.group('i') or 'common'][mobj.group('key')] = value
 766
 767         # Write id3v1 metadata also since Windows Explorer can't handle id3v2 tags
 768         yield ('-write_id3v1', '1')
 769
 770         for name, value in metadata['common'].items():
 771             yield ('-metadata', f'{name}={value}')
 772
 773         stream_idx = 0
 774         for fmt in info.get('requested_formats') or []:
 775             stream_count = 2 if 'none' not in (fmt.get('vcodec'), fmt.get('acodec')) else 1
 776             lang = ISO639Utils.short2long(fmt.get('language') or '') or fmt.get('language')
 777             for i in range(stream_idx, stream_idx + stream_count):
 778                 if lang:
 779                     metadata[str(i)].setdefault('language', lang)
 780                 for name, value in metadata[str(i)].items():
 781                     yield (f'-metadata:s:{i}', f'{name}={value}')
 782             stream_idx += stream_count
 783
 784     def _get_infojson_opts(self, info, infofn):
 785         if not infofn or not os.path.exists(infofn):
 786             if self._add_infojson is not True:
 787                 return
 788             infofn = infofn or '%s.temp' % (
 789                 self._downloader.prepare_filename(info, 'infojson')
 790                 or replace_extension(self._downloader.prepare_filename(info), 'info.json', info['ext']))
 791             if not self._downloader._ensure_dir_exists(infofn):
 792                 return
 793             self.write_debug(f'Writing info-json to: {infofn}')
 794             write_json_file(self._downloader.sanitize_info(info, self.get_param('clean_infojson', True)), infofn)
 795             info['infojson_filename'] = infofn
 796
 797         old_stream, new_stream = self.get_stream_number(info['filepath'], ('tags', 'mimetype'), 'application/json')
 798         if old_stream is not None:
 799             yield ('-map', '-0:%d' % old_stream)
 800             new_stream -= 1
 801
 802         yield ('-attach', infofn,
 803                '-metadata:s:%d' % new_stream, 'mimetype=application/json')
 804
 805
 806 class FFmpegMergerPP(FFmpegPostProcessor):
 807     @PostProcessor._restrict_to(images=False)
 808     def run(self, info):
 809         filename = info['filepath']
 810         temp_filename = prepend_extension(filename, 'temp')
 811         args = ['-c', 'copy']
 812         audio_streams = 0
 813         for (i, fmt) in enumerate(info['requested_formats']):
 814             if fmt.get('acodec') != 'none':
 815                 args.extend(['-map', f'{i}:a:0'])
 816                 aac_fixup = fmt['protocol'].startswith('m3u8') and self.get_audio_codec(fmt['filepath']) == 'aac'
 817                 if aac_fixup:
 818                     args.extend([f'-bsf:a:{audio_streams}', 'aac_adtstoasc'])
 819                 audio_streams += 1
 820             if fmt.get('vcodec') != 'none':
 821                 args.extend(['-map', '%u:v:0' % (i)])
 822         self.to_screen('Merging formats into "%s"' % filename)
 823         self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
 824         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 825         return info['__files_to_merge'], info
 826
 827     def can_merge(self):
 828         # TODO: figure out merge-capable ffmpeg version
 829         if self.basename != 'avconv':
 830             return True
 831
 832         required_version = '10-0'
 833         if is_outdated_version(
 834                 self._versions[self.basename], required_version):
 835             warning = ('Your copy of %s is outdated and unable to properly mux separate video and audio files, '
 836                        'yt-dlp will download single file media. '
 837                        'Update %s to version %s or newer to fix this.') % (
 838                            self.basename, self.basename, required_version)
 839             self.report_warning(warning)
 840             return False
 841         return True
 842
 843
 844 class FFmpegFixupPostProcessor(FFmpegPostProcessor):
 845     def _fixup(self, msg, filename, options):
 846         temp_filename = prepend_extension(filename, 'temp')
 847
 848         self.to_screen(f'{msg} of "{filename}"')
 849         self.run_ffmpeg(filename, temp_filename, options)
 850
 851         os.replace(temp_filename, filename)
 852
 853
 854 class FFmpegFixupStretchedPP(FFmpegFixupPostProcessor):
 855     @PostProcessor._restrict_to(images=False, audio=False)
 856     def run(self, info):
 857         stretched_ratio = info.get('stretched_ratio')
 858         if stretched_ratio not in (None, 1):
 859             self._fixup('Fixing aspect ratio', info['filepath'], [
 860                 *self.stream_copy_opts(), '-aspect', '%f' % stretched_ratio])
 861         return [], info
 862
 863
 864 class FFmpegFixupM4aPP(FFmpegFixupPostProcessor):
 865     @PostProcessor._restrict_to(images=False, video=False)
 866     def run(self, info):
 867         if info.get('container') == 'm4a_dash':
 868             self._fixup('Correcting container', info['filepath'], [*self.stream_copy_opts(), '-f', 'mp4'])
 869         return [], info
 870
 871
 872 class FFmpegFixupM3u8PP(FFmpegFixupPostProcessor):
 873     def _needs_fixup(self, info):
 874         yield info['ext'] in ('mp4', 'm4a')
 875         yield info['protocol'].startswith('m3u8')
 876         try:
 877             metadata = self.get_metadata_object(info['filepath'])
 878         except PostProcessingError as e:
 879             self.report_warning(f'Unable to extract metadata: {e.msg}')
 880             yield True
 881         else:
 882             yield traverse_obj(metadata, ('format', 'format_name'), casesense=False) == 'mpegts'
 883
 884     @PostProcessor._restrict_to(images=False)
 885     def run(self, info):
 886         if all(self._needs_fixup(info)):
 887             self._fixup('Fixing MPEG-TS in MP4 container', info['filepath'], [
 888                 *self.stream_copy_opts(), '-f', 'mp4', '-bsf:a', 'aac_adtstoasc'])
 889         return [], info
 890
 891
 892 class FFmpegFixupTimestampPP(FFmpegFixupPostProcessor):
 893
 894     def __init__(self, downloader=None, trim=0.001):
 895         # "trim" should be used when the video contains unintended packets
 896         super().__init__(downloader)
 897         assert isinstance(trim, (int, float))
 898         self.trim = str(trim)
 899
 900     @PostProcessor._restrict_to(images=False)
 901     def run(self, info):
 902         if not self._features.get('setts'):
 903             self.report_warning(
 904                 'A re-encode is needed to fix timestamps in older versions of ffmpeg. '
 905                 'Please install ffmpeg 4.4 or later to fixup without re-encoding')
 906             opts = ['-vf', 'setpts=PTS-STARTPTS']
 907         else:
 908             opts = ['-c', 'copy', '-bsf', 'setts=ts=TS-STARTPTS']
 909         self._fixup('Fixing frame timestamp', info['filepath'], opts + [*self.stream_copy_opts(False), '-ss', self.trim])
 910         return [], info
 911
 912
 913 class FFmpegCopyStreamPP(FFmpegFixupPostProcessor):
 914     MESSAGE = 'Copying stream'
 915
 916     @PostProcessor._restrict_to(images=False)
 917     def run(self, info):
 918         self._fixup(self.MESSAGE, info['filepath'], self.stream_copy_opts())
 919         return [], info
 920
 921
 922 class FFmpegFixupDurationPP(FFmpegCopyStreamPP):
 923     MESSAGE = 'Fixing video duration'
 924
 925
 926 class FFmpegFixupDuplicateMoovPP(FFmpegCopyStreamPP):
 927     MESSAGE = 'Fixing duplicate MOOV atoms'
 928
 929
 930 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 931     SUPPORTED_EXTS = ('srt', 'vtt', 'ass', 'lrc')
 932
 933     def __init__(self, downloader=None, format=None):
 934         super().__init__(downloader)
 935         self.format = format
 936
 937     def run(self, info):
 938         subs = info.get('requested_subtitles')
 939         new_ext = self.format
 940         new_format = new_ext
 941         if new_format == 'vtt':
 942             new_format = 'webvtt'
 943         if subs is None:
 944             self.to_screen('There aren\'t any subtitles to convert')
 945             return [], info
 946         self.to_screen('Converting subtitles')
 947         sub_filenames = []
 948         for lang, sub in subs.items():
 949             if not os.path.exists(sub.get('filepath', '')):
 950                 self.report_warning(f'Skipping embedding {lang} subtitle because the file is missing')
 951                 continue
 952             ext = sub['ext']
 953             if ext == new_ext:
 954                 self.to_screen('Subtitle file for %s is already in the requested format' % new_ext)
 955                 continue
 956             elif ext == 'json':
 957                 self.to_screen(
 958                     'You have requested to convert json subtitles into another format, '
 959                     'which is currently not possible')
 960                 continue
 961             old_file = sub['filepath']
 962             sub_filenames.append(old_file)
 963             new_file = replace_extension(old_file, new_ext)
 964
 965             if ext in ('dfxp', 'ttml', 'tt'):
 966                 self.report_warning(
 967                     'You have requested to convert dfxp (TTML) subtitles into another format, '
 968                     'which results in style information loss')
 969
 970                 dfxp_file = old_file
 971                 srt_file = replace_extension(old_file, 'srt')
 972
 973                 with open(dfxp_file, 'rb') as f:
 974                     srt_data = dfxp2srt(f.read())
 975
 976                 with open(srt_file, 'wt', encoding='utf-8') as f:
 977                     f.write(srt_data)
 978                 old_file = srt_file
 979
 980                 subs[lang] = {
 981                     'ext': 'srt',
 982                     'data': srt_data,
 983                     'filepath': srt_file,
 984                 }
 985
 986                 if new_ext == 'srt':
 987                     continue
 988                 else:
 989                     sub_filenames.append(srt_file)
 990
 991             self.run_ffmpeg(old_file, new_file, ['-f', new_format])
 992
 993             with open(new_file, encoding='utf-8') as f:
 994                 subs[lang] = {
 995                     'ext': new_ext,
 996                     'data': f.read(),
 997                     'filepath': new_file,
 998                 }
 999
1000             info['__files_to_move'][new_file] = replace_extension(
1001                 info['__files_to_move'][sub['filepath']], new_ext)
1002
1003         return sub_filenames, info
1004
1005
1006 class FFmpegSplitChaptersPP(FFmpegPostProcessor):
1007     def __init__(self, downloader, force_keyframes=False):
1008         FFmpegPostProcessor.__init__(self, downloader)
1009         self._force_keyframes = force_keyframes
1010
1011     def _prepare_filename(self, number, chapter, info):
1012         info = info.copy()
1013         info.update({
1014             'section_number': number,
1015             'section_title': chapter.get('title'),
1016             'section_start': chapter.get('start_time'),
1017             'section_end': chapter.get('end_time'),
1018         })
1019         return self._downloader.prepare_filename(info, 'chapter')
1020
1021     def _ffmpeg_args_for_chapter(self, number, chapter, info):
1022         destination = self._prepare_filename(number, chapter, info)
1023         if not self._downloader._ensure_dir_exists(encodeFilename(destination)):
1024             return
1025
1026         chapter['filepath'] = destination
1027         self.to_screen('Chapter %03d; Destination: %s' % (number, destination))
1028         return (
1029             destination,
1030             ['-ss', compat_str(chapter['start_time']),
1031              '-t', compat_str(chapter['end_time'] - chapter['start_time'])])
1032
1033     @PostProcessor._restrict_to(images=False)
1034     def run(self, info):
1035         chapters = info.get('chapters') or []
1036         if not chapters:
1037             self.to_screen('Chapter information is unavailable')
1038             return [], info
1039
1040         in_file = info['filepath']
1041         if self._force_keyframes and len(chapters) > 1:
1042             in_file = self.force_keyframes(in_file, (c['start_time'] for c in chapters))
1043         self.to_screen('Splitting video by chapters; %d chapters found' % len(chapters))
1044         for idx, chapter in enumerate(chapters):
1045             destination, opts = self._ffmpeg_args_for_chapter(idx + 1, chapter, info)
1046             self.real_run_ffmpeg([(in_file, opts)], [(destination, self.stream_copy_opts())])
1047         if in_file != info['filepath']:
1048             os.remove(in_file)
1049         return [], info
1050
1051
1052 class FFmpegThumbnailsConvertorPP(FFmpegPostProcessor):
1053     SUPPORTED_EXTS = ('jpg', 'png', 'webp')
1054
1055     def __init__(self, downloader=None, format=None):
1056         super().__init__(downloader)
1057         self.format = format
1058
1059     @staticmethod
1060     def is_webp(path):
1061         with open(encodeFilename(path), 'rb') as f:
1062             b = f.read(12)
1063         return b[0:4] == b'RIFF' and b[8:] == b'WEBP'
1064
1065     def fixup_webp(self, info, idx=-1):
1066         thumbnail_filename = info['thumbnails'][idx]['filepath']
1067         _, thumbnail_ext = os.path.splitext(thumbnail_filename)
1068         if thumbnail_ext:
1069             thumbnail_ext = thumbnail_ext[1:].lower()
1070             if thumbnail_ext != 'webp' and self.is_webp(thumbnail_filename):
1071                 self.to_screen('Correcting thumbnail "%s" extension to webp' % thumbnail_filename)
1072                 webp_filename = replace_extension(thumbnail_filename, 'webp')
1073                 os.replace(thumbnail_filename, webp_filename)
1074                 info['thumbnails'][idx]['filepath'] = webp_filename
1075                 info['__files_to_move'][webp_filename] = replace_extension(
1076                     info['__files_to_move'].pop(thumbnail_filename), 'webp')
1077
1078     @staticmethod
1079     def _options(target_ext):
1080         if target_ext == 'jpg':
1081             return ['-bsf:v', 'mjpeg2jpeg']
1082         return []
1083
1084     def convert_thumbnail(self, thumbnail_filename, target_ext):
1085         thumbnail_conv_filename = replace_extension(thumbnail_filename, target_ext)
1086
1087         self.to_screen(f'Converting thumbnail "{thumbnail_filename}" to {target_ext}')
1088         self.real_run_ffmpeg(
1089             [(thumbnail_filename, ['-f', 'image2', '-pattern_type', 'none'])],
1090             [(thumbnail_conv_filename.replace('%', '%%'), self._options(target_ext))])
1091         return thumbnail_conv_filename
1092
1093     def run(self, info):
1094         files_to_delete = []
1095         has_thumbnail = False
1096
1097         for idx, thumbnail_dict in enumerate(info.get('thumbnails') or []):
1098             original_thumbnail = thumbnail_dict.get('filepath')
1099             if not original_thumbnail:
1100                 continue
1101             has_thumbnail = True
1102             self.fixup_webp(info, idx)
1103             _, thumbnail_ext = os.path.splitext(original_thumbnail)
1104             if thumbnail_ext:
1105                 thumbnail_ext = thumbnail_ext[1:].lower()
1106             if thumbnail_ext == 'jpeg':
1107                 thumbnail_ext = 'jpg'
1108             if thumbnail_ext == self.format:
1109                 self.to_screen('Thumbnail "%s" is already in the requested format' % original_thumbnail)
1110                 continue
1111             thumbnail_dict['filepath'] = self.convert_thumbnail(original_thumbnail, self.format)
1112             files_to_delete.append(original_thumbnail)
1113             info['__files_to_move'][thumbnail_dict['filepath']] = replace_extension(
1114                 info['__files_to_move'][original_thumbnail], self.format)
1115
1116         if not has_thumbnail:
1117             self.to_screen('There aren\'t any thumbnails to convert')
1118         return files_to_delete, info
1119
1120
1121 class FFmpegConcatPP(FFmpegPostProcessor):
1122     def __init__(self, downloader, only_multi_video=False):
1123         self._only_multi_video = only_multi_video
1124         super().__init__(downloader)
1125
1126     def _get_codecs(self, file):
1127         codecs = traverse_obj(self.get_metadata_object(file), ('streams', ..., 'codec_name'))
1128         self.write_debug(f'Codecs = {", ".join(codecs)}')
1129         return tuple(codecs)
1130
1131     def concat_files(self, in_files, out_file):
1132         if not self._downloader._ensure_dir_exists(out_file):
1133             return
1134         if len(in_files) == 1:
1135             if os.path.realpath(in_files[0]) != os.path.realpath(out_file):
1136                 self.to_screen(f'Moving "{in_files[0]}" to "{out_file}"')
1137             os.replace(in_files[0], out_file)
1138             return []
1139
1140         if len(set(map(self._get_codecs, in_files))) > 1:
1141             raise PostProcessingError(
1142                 'The files have different streams/codecs and cannot be concatenated. '
1143                 'Either select different formats or --recode-video them to a common format')
1144
1145         self.to_screen(f'Concatenating {len(in_files)} files; Destination: {out_file}')
1146         super().concat_files(in_files, out_file)
1147         return in_files
1148
1149     @PostProcessor._restrict_to(images=False, simulated=False)
1150     def run(self, info):
1151         entries = info.get('entries') or []
1152         if not any(entries) or (self._only_multi_video and info['_type'] != 'multi_video'):
1153             return [], info
1154         elif traverse_obj(entries, (..., 'requested_downloads', lambda _, v: len(v) > 1)):
1155             raise PostProcessingError('Concatenation is not supported when downloading multiple separate formats')
1156
1157         in_files = traverse_obj(entries, (..., 'requested_downloads', 0, 'filepath')) or []
1158         if len(in_files) < len(entries):
1159             raise PostProcessingError('Aborting concatenation because some downloads failed')
1160
1161         ie_copy = self._downloader._playlist_infodict(info)
1162         exts = traverse_obj(entries, (..., 'requested_downloads', 0, 'ext'), (..., 'ext'))
1163         ie_copy['ext'] = exts[0] if len(set(exts)) == 1 else 'mkv'
1164         out_file = self._downloader.prepare_filename(ie_copy, 'pl_video')
1165
1166         files_to_delete = self.concat_files(in_files, out_file)
1167
1168         info['requested_downloads'] = [{
1169             'filepath': out_file,
1170             'ext': ie_copy['ext'],
1171         }]
1172         return files_to_delete, info