yt_dlp/postprocessor/ffmpeg.py

   1 from __future__ import unicode_literals
   2
   3 import io
   4 import itertools
   5 import os
   6 import subprocess
   7 import time
   8 import re
   9 import json
  10
  11
  12 from .common import AudioConversionError, PostProcessor
  13
  14 from ..compat import compat_str, compat_numeric_types
  15 from ..utils import (
  16     encodeArgument,
  17     encodeFilename,
  18     get_exe_version,
  19     is_outdated_version,
  20     PostProcessingError,
  21     prepend_extension,
  22     shell_quote,
  23     dfxp2srt,
  24     ISO639Utils,
  25     process_communicate_or_kill,
  26     replace_extension,
  27     traverse_obj,
  28     variadic,
  29 )
  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 }
  44 ACODECS = {
  45     'mp3': 'libmp3lame',
  46     'aac': 'aac',
  47     'flac': 'flac',
  48     'm4a': 'aac',
  49     'opus': 'libopus',
  50     'vorbis': 'libvorbis',
  51     'wav': None,
  52 }
  53
  54
  55 class FFmpegPostProcessorError(PostProcessingError):
  56     pass
  57
  58
  59 class FFmpegPostProcessor(PostProcessor):
  60     def __init__(self, downloader=None):
  61         PostProcessor.__init__(self, downloader)
  62         self._determine_executables()
  63
  64     def check_version(self):
  65         if not self.available:
  66             raise FFmpegPostProcessorError('ffmpeg not found. Please install or provide the path using --ffmpeg-location')
  67
  68         required_version = '10-0' if self.basename == 'avconv' else '1.0'
  69         if is_outdated_version(
  70                 self._versions[self.basename], required_version):
  71             warning = 'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.' % (
  72                 self.basename, self.basename, required_version)
  73             self.report_warning(warning)
  74
  75     @staticmethod
  76     def get_versions(downloader=None):
  77         return FFmpegPostProcessor(downloader)._versions
  78
  79     def _determine_executables(self):
  80         programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe']
  81         prefer_ffmpeg = True
  82
  83         def get_ffmpeg_version(path):
  84             ver = get_exe_version(path, args=['-version'])
  85             if ver:
  86                 regexs = [
  87                     r'(?:\d+:)?([0-9.]+)-[0-9]+ubuntu[0-9.]+$',  # Ubuntu, see [1]
  88                     r'n([0-9.]+)$',  # Arch Linux
  89                     # 1. http://www.ducea.com/2006/06/17/ubuntu-package-version-naming-explanation/
  90                 ]
  91                 for regex in regexs:
  92                     mobj = re.match(regex, ver)
  93                     if mobj:
  94                         ver = mobj.group(1)
  95             return ver
  96
  97         self.basename = None
  98         self.probe_basename = None
  99
 100         self._paths = None
 101         self._versions = None
 102         if self._downloader:
 103             prefer_ffmpeg = self.get_param('prefer_ffmpeg', True)
 104             location = self.get_param('ffmpeg_location')
 105             if location is not None:
 106                 if not os.path.exists(location):
 107                     self.report_warning(
 108                         'ffmpeg-location %s does not exist! '
 109                         'Continuing without ffmpeg.' % (location))
 110                     self._versions = {}
 111                     return
 112                 elif os.path.isdir(location):
 113                     dirname, basename = location, None
 114                 else:
 115                     basename = os.path.splitext(os.path.basename(location))[0]
 116                     basename = next((p for p in programs if basename.startswith(p)), 'ffmpeg')
 117                     dirname = os.path.dirname(os.path.abspath(location))
 118                     if basename in ('ffmpeg', 'ffprobe'):
 119                         prefer_ffmpeg = True
 120
 121                 self._paths = dict(
 122                     (p, os.path.join(dirname, p)) for p in programs)
 123                 if basename:
 124                     self._paths[basename] = location
 125                 self._versions = dict(
 126                     (p, get_ffmpeg_version(self._paths[p])) for p in programs)
 127         if self._versions is None:
 128             self._versions = dict(
 129                 (p, get_ffmpeg_version(p)) for p in programs)
 130             self._paths = dict((p, p) for p in programs)
 131
 132         if prefer_ffmpeg is False:
 133             prefs = ('avconv', 'ffmpeg')
 134         else:
 135             prefs = ('ffmpeg', 'avconv')
 136         for p in prefs:
 137             if self._versions[p]:
 138                 self.basename = p
 139                 break
 140
 141         if prefer_ffmpeg is False:
 142             prefs = ('avprobe', 'ffprobe')
 143         else:
 144             prefs = ('ffprobe', 'avprobe')
 145         for p in prefs:
 146             if self._versions[p]:
 147                 self.probe_basename = p
 148                 break
 149
 150     @property
 151     def available(self):
 152         return self.basename is not None
 153
 154     @property
 155     def executable(self):
 156         return self._paths[self.basename]
 157
 158     @property
 159     def probe_available(self):
 160         return self.probe_basename is not None
 161
 162     @property
 163     def probe_executable(self):
 164         return self._paths[self.probe_basename]
 165
 166     def get_audio_codec(self, path):
 167         if not self.probe_available and not self.available:
 168             raise PostProcessingError('ffprobe and ffmpeg not found. Please install or provide the path using --ffmpeg-location')
 169         try:
 170             if self.probe_available:
 171                 cmd = [
 172                     encodeFilename(self.probe_executable, True),
 173                     encodeArgument('-show_streams')]
 174             else:
 175                 cmd = [
 176                     encodeFilename(self.executable, True),
 177                     encodeArgument('-i')]
 178             cmd.append(encodeFilename(self._ffmpeg_filename_argument(path), True))
 179             self.write_debug('%s command line: %s' % (self.basename, shell_quote(cmd)))
 180             handle = subprocess.Popen(
 181                 cmd, stderr=subprocess.PIPE,
 182                 stdout=subprocess.PIPE, stdin=subprocess.PIPE)
 183             stdout_data, stderr_data = process_communicate_or_kill(handle)
 184             expected_ret = 0 if self.probe_available else 1
 185             if handle.wait() != expected_ret:
 186                 return None
 187         except (IOError, OSError):
 188             return None
 189         output = (stdout_data if self.probe_available else stderr_data).decode('ascii', 'ignore')
 190         if self.probe_available:
 191             audio_codec = None
 192             for line in output.split('\n'):
 193                 if line.startswith('codec_name='):
 194                     audio_codec = line.split('=')[1].strip()
 195                 elif line.strip() == 'codec_type=audio' and audio_codec is not None:
 196                     return audio_codec
 197         else:
 198             # Stream #FILE_INDEX:STREAM_INDEX[STREAM_ID](LANGUAGE): CODEC_TYPE: CODEC_NAME
 199             mobj = re.search(
 200                 r'Stream\s*#\d+:\d+(?:\[0x[0-9a-f]+\])?(?:\([a-z]{3}\))?:\s*Audio:\s*([0-9a-z]+)',
 201                 output)
 202             if mobj:
 203                 return mobj.group(1)
 204         return None
 205
 206     def get_metadata_object(self, path, opts=[]):
 207         if self.probe_basename != 'ffprobe':
 208             if self.probe_available:
 209                 self.report_warning('Only ffprobe is supported for metadata extraction')
 210             raise PostProcessingError('ffprobe not found. Please install or provide the path using --ffmpeg-location')
 211         self.check_version()
 212
 213         cmd = [
 214             encodeFilename(self.probe_executable, True),
 215             encodeArgument('-hide_banner'),
 216             encodeArgument('-show_format'),
 217             encodeArgument('-show_streams'),
 218             encodeArgument('-print_format'),
 219             encodeArgument('json'),
 220         ]
 221
 222         cmd += opts
 223         cmd.append(encodeFilename(self._ffmpeg_filename_argument(path), True))
 224         self.write_debug('ffprobe command line: %s' % shell_quote(cmd))
 225         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 226         stdout, stderr = p.communicate()
 227         return json.loads(stdout.decode('utf-8', 'replace'))
 228
 229     def get_stream_number(self, path, keys, value):
 230         streams = self.get_metadata_object(path)['streams']
 231         num = next(
 232             (i for i, stream in enumerate(streams) if traverse_obj(stream, keys, casesense=False) == value),
 233             None)
 234         return num, len(streams)
 235
 236     def run_ffmpeg_multiple_files(self, input_paths, out_path, opts, **kwargs):
 237         return self.real_run_ffmpeg(
 238             [(path, []) for path in input_paths],
 239             [(out_path, opts)], **kwargs)
 240
 241     def real_run_ffmpeg(self, input_path_opts, output_path_opts, *, expected_retcodes=(0,)):
 242         self.check_version()
 243
 244         oldest_mtime = min(
 245             os.stat(encodeFilename(path)).st_mtime for path, _ in input_path_opts if path)
 246
 247         cmd = [encodeFilename(self.executable, True), encodeArgument('-y')]
 248         # avconv does not have repeat option
 249         if self.basename == 'ffmpeg':
 250             cmd += [encodeArgument('-loglevel'), encodeArgument('repeat+info')]
 251
 252         def make_args(file, args, name, number):
 253             keys = ['_%s%d' % (name, number), '_%s' % name]
 254             if name == 'o' and number == 1:
 255                 keys.append('')
 256             args += self._configuration_args(self.basename, keys)
 257             if name == 'i':
 258                 args.append('-i')
 259             return (
 260                 [encodeArgument(arg) for arg in args]
 261                 + [encodeFilename(self._ffmpeg_filename_argument(file), True)])
 262
 263         for arg_type, path_opts in (('i', input_path_opts), ('o', output_path_opts)):
 264             cmd += itertools.chain.from_iterable(
 265                 make_args(path, list(opts), arg_type, i + 1)
 266                 for i, (path, opts) in enumerate(path_opts) if path)
 267
 268         self.write_debug('ffmpeg command line: %s' % shell_quote(cmd))
 269         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 270         stdout, stderr = process_communicate_or_kill(p)
 271         if p.returncode not in variadic(expected_retcodes):
 272             stderr = stderr.decode('utf-8', 'replace').strip()
 273             if self.get_param('verbose', False):
 274                 self.report_error(stderr)
 275             raise FFmpegPostProcessorError(stderr.split('\n')[-1])
 276         for out_path, _ in output_path_opts:
 277             if out_path:
 278                 self.try_utime(out_path, oldest_mtime, oldest_mtime)
 279         return stderr.decode('utf-8', 'replace')
 280
 281     def run_ffmpeg(self, path, out_path, opts, **kwargs):
 282         return self.run_ffmpeg_multiple_files([path], out_path, opts, **kwargs)
 283
 284     def _ffmpeg_filename_argument(self, fn):
 285         # Always use 'file:' because the filename may contain ':' (ffmpeg
 286         # interprets that as a protocol) or can start with '-' (-- is broken in
 287         # ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
 288         # Also leave '-' intact in order not to break streaming to stdout.
 289         if fn.startswith(('http://', 'https://')):
 290             return fn
 291         return 'file:' + fn if fn != '-' else fn
 292
 293
 294 class FFmpegExtractAudioPP(FFmpegPostProcessor):
 295     COMMON_AUDIO_EXTS = ('wav', 'flac', 'm4a', 'aiff', 'mp3', 'ogg', 'mka', 'opus', 'wma')
 296     SUPPORTED_EXTS = ('best', 'aac', 'flac', 'mp3', 'm4a', 'opus', 'vorbis', 'wav')
 297
 298     def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
 299         FFmpegPostProcessor.__init__(self, downloader)
 300         self._preferredcodec = preferredcodec or 'best'
 301         self._preferredquality = preferredquality
 302         self._nopostoverwrites = nopostoverwrites
 303
 304     def run_ffmpeg(self, path, out_path, codec, more_opts):
 305         if codec is None:
 306             acodec_opts = []
 307         else:
 308             acodec_opts = ['-acodec', codec]
 309         opts = ['-vn'] + acodec_opts + more_opts
 310         try:
 311             FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
 312         except FFmpegPostProcessorError as err:
 313             raise AudioConversionError(err.msg)
 314
 315     @PostProcessor._restrict_to(images=False)
 316     def run(self, information):
 317         path = information['filepath']
 318         orig_ext = information['ext']
 319
 320         if self._preferredcodec == 'best' and orig_ext in self.COMMON_AUDIO_EXTS:
 321             self.to_screen('Skipping audio extraction since the file is already in a common audio format')
 322             return [], information
 323
 324         filecodec = self.get_audio_codec(path)
 325         if filecodec is None:
 326             raise PostProcessingError('WARNING: unable to obtain file audio codec with ffprobe')
 327
 328         more_opts = []
 329         if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
 330             if filecodec == 'aac' and self._preferredcodec in ['m4a', 'best']:
 331                 # Lossless, but in another container
 332                 acodec = 'copy'
 333                 extension = 'm4a'
 334                 more_opts = ['-bsf:a', 'aac_adtstoasc']
 335             elif filecodec in ['aac', 'flac', 'mp3', 'vorbis', 'opus']:
 336                 # Lossless if possible
 337                 acodec = 'copy'
 338                 extension = filecodec
 339                 if filecodec == 'aac':
 340                     more_opts = ['-f', 'adts']
 341                 if filecodec == 'vorbis':
 342                     extension = 'ogg'
 343             else:
 344                 # MP3 otherwise.
 345                 acodec = 'libmp3lame'
 346                 extension = 'mp3'
 347                 more_opts = []
 348                 if self._preferredquality is not None:
 349                     if int(self._preferredquality) < 10:
 350                         more_opts += ['-q:a', self._preferredquality]
 351                     else:
 352                         more_opts += ['-b:a', self._preferredquality + 'k']
 353         else:
 354             # We convert the audio (lossy if codec is lossy)
 355             acodec = ACODECS[self._preferredcodec]
 356             extension = self._preferredcodec
 357             more_opts = []
 358             if self._preferredquality is not None:
 359                 # The opus codec doesn't support the -aq option
 360                 if int(self._preferredquality) < 10 and extension != 'opus':
 361                     more_opts += ['-q:a', self._preferredquality]
 362                 else:
 363                     more_opts += ['-b:a', self._preferredquality + 'k']
 364             if self._preferredcodec == 'aac':
 365                 more_opts += ['-f', 'adts']
 366             if self._preferredcodec == 'm4a':
 367                 more_opts += ['-bsf:a', 'aac_adtstoasc']
 368             if self._preferredcodec == 'vorbis':
 369                 extension = 'ogg'
 370             if self._preferredcodec == 'wav':
 371                 extension = 'wav'
 372                 more_opts += ['-f', 'wav']
 373
 374         prefix, sep, ext = path.rpartition('.')  # not os.path.splitext, since the latter does not work on unicode in all setups
 375         new_path = prefix + sep + extension
 376
 377         information['filepath'] = new_path
 378         information['ext'] = extension
 379
 380         # If we download foo.mp3 and convert it to... foo.mp3, then don't delete foo.mp3, silly.
 381         if (new_path == path
 382                 or (self._nopostoverwrites and os.path.exists(encodeFilename(new_path)))):
 383             self.to_screen('Post-process file %s exists, skipping' % new_path)
 384             return [], information
 385
 386         try:
 387             self.to_screen('Destination: ' + new_path)
 388             self.run_ffmpeg(path, new_path, acodec, more_opts)
 389         except AudioConversionError as e:
 390             raise PostProcessingError(
 391                 'audio conversion failed: ' + e.msg)
 392         except Exception:
 393             raise PostProcessingError('error running ' + self.basename)
 394
 395         # Try to update the date time for extracted audio file.
 396         if information.get('filetime') is not None:
 397             self.try_utime(
 398                 new_path, time.time(), information['filetime'],
 399                 errnote='Cannot update utime of audio file')
 400
 401         return [path], information
 402
 403
 404 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 405     SUPPORTED_EXTS = ('mp4', 'mkv', 'flv', 'webm', 'mov', 'avi', 'mp3', 'mka', 'm4a', 'ogg', 'opus')
 406     FORMAT_RE = re.compile(r'{0}(?:/{0})*$'.format(r'(?:\w+>)?(?:%s)' % '|'.join(SUPPORTED_EXTS)))
 407     _action = 'converting'
 408
 409     def __init__(self, downloader=None, preferedformat=None):
 410         super(FFmpegVideoConvertorPP, self).__init__(downloader)
 411         self._preferedformats = preferedformat.lower().split('/')
 412
 413     def _target_ext(self, source_ext):
 414         for pair in self._preferedformats:
 415             kv = pair.split('>')
 416             if len(kv) == 1 or kv[0].strip() == source_ext:
 417                 return kv[-1].strip()
 418
 419     @staticmethod
 420     def _options(target_ext):
 421         if target_ext == 'avi':
 422             return ['-c:v', 'libxvid', '-vtag', 'XVID']
 423         return []
 424
 425     @PostProcessor._restrict_to(images=False)
 426     def run(self, information):
 427         path, source_ext = information['filepath'], information['ext'].lower()
 428         target_ext = self._target_ext(source_ext)
 429         _skip_msg = (
 430             'could not find a mapping for %s' if not target_ext
 431             else 'already is in target format %s' if source_ext == target_ext
 432             else None)
 433         if _skip_msg:
 434             self.to_screen('Not %s media file "%s"; %s' % (self._action, path, _skip_msg % source_ext))
 435             return [], information
 436
 437         prefix, sep, oldext = path.rpartition('.')
 438         outpath = prefix + sep + target_ext
 439         self.to_screen('%s video from %s to %s; Destination: %s' % (self._action.title(), source_ext, target_ext, outpath))
 440         self.run_ffmpeg(path, outpath, self._options(target_ext))
 441
 442         information['filepath'] = outpath
 443         information['format'] = information['ext'] = target_ext
 444         return [path], information
 445
 446
 447 class FFmpegVideoRemuxerPP(FFmpegVideoConvertorPP):
 448     _action = 'remuxing'
 449
 450     @staticmethod
 451     def _options(target_ext):
 452         options = ['-c', 'copy', '-map', '0', '-dn']
 453         if target_ext in ['mp4', 'm4a', 'mov']:
 454             options.extend(['-movflags', '+faststart'])
 455         return options
 456
 457
 458 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 459     def __init__(self, downloader=None, already_have_subtitle=False):
 460         super(FFmpegEmbedSubtitlePP, self).__init__(downloader)
 461         self._already_have_subtitle = already_have_subtitle
 462
 463     @PostProcessor._restrict_to(images=False)
 464     def run(self, information):
 465         if information['ext'] not in ('mp4', 'webm', 'mkv'):
 466             self.to_screen('Subtitles can only be embedded in mp4, webm or mkv files')
 467             return [], information
 468         subtitles = information.get('requested_subtitles')
 469         if not subtitles:
 470             self.to_screen('There aren\'t any subtitles to embed')
 471             return [], information
 472
 473         filename = information['filepath']
 474
 475         ext = information['ext']
 476         sub_langs, sub_names, sub_filenames = [], [], []
 477         webm_vtt_warn = False
 478         mp4_ass_warn = False
 479
 480         for lang, sub_info in subtitles.items():
 481             if not os.path.exists(information.get('filepath', '')):
 482                 self.report_warning(f'Skipping embedding {lang} subtitle because the file is missing')
 483                 continue
 484             sub_ext = sub_info['ext']
 485             if sub_ext == 'json':
 486                 self.report_warning('JSON subtitles cannot be embedded')
 487             elif ext != 'webm' or ext == 'webm' and sub_ext == 'vtt':
 488                 sub_langs.append(lang)
 489                 sub_names.append(sub_info.get('name'))
 490                 sub_filenames.append(sub_info['filepath'])
 491             else:
 492                 if not webm_vtt_warn and ext == 'webm' and sub_ext != 'vtt':
 493                     webm_vtt_warn = True
 494                     self.report_warning('Only WebVTT subtitles can be embedded in webm files')
 495             if not mp4_ass_warn and ext == 'mp4' and sub_ext == 'ass':
 496                 mp4_ass_warn = True
 497                 self.report_warning('ASS subtitles cannot be properly embedded in mp4 files; expect issues')
 498
 499         if not sub_langs:
 500             return [], information
 501
 502         input_files = [filename] + sub_filenames
 503
 504         opts = [
 505             '-c', 'copy', '-map', '0', '-dn',
 506             # Don't copy the existing subtitles, we may be running the
 507             # postprocessor a second time
 508             '-map', '-0:s',
 509             # Don't copy Apple TV chapters track, bin_data (see #19042, #19024,
 510             # https://trac.ffmpeg.org/ticket/6016)
 511             '-map', '-0:d',
 512         ]
 513         if information['ext'] == 'mp4':
 514             opts += ['-c:s', 'mov_text']
 515         for i, (lang, name) in enumerate(zip(sub_langs, sub_names)):
 516             opts.extend(['-map', '%d:0' % (i + 1)])
 517             lang_code = ISO639Utils.short2long(lang) or lang
 518             opts.extend(['-metadata:s:s:%d' % i, 'language=%s' % lang_code])
 519             if name:
 520                 opts.extend(['-metadata:s:s:%d' % i, 'handler_name=%s' % name,
 521                              '-metadata:s:s:%d' % i, 'title=%s' % name])
 522
 523         temp_filename = prepend_extension(filename, 'temp')
 524         self.to_screen('Embedding subtitles in "%s"' % filename)
 525         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
 526         os.replace(temp_filename, filename)
 527
 528         files_to_delete = [] if self._already_have_subtitle else sub_filenames
 529         return files_to_delete, information
 530
 531
 532 class FFmpegMetadataPP(FFmpegPostProcessor):
 533
 534     @staticmethod
 535     def _options(target_ext):
 536         yield from ('-map', '0', '-dn')
 537         if target_ext == 'm4a':
 538             yield from ('-vn', '-acodec', 'copy')
 539         else:
 540             yield from ('-c', 'copy')
 541
 542     @PostProcessor._restrict_to(images=False)
 543     def run(self, info):
 544         metadata = {}
 545
 546         def add(meta_list, info_list=None):
 547             if not meta_list:
 548                 return
 549             for info_f in variadic(info_list or meta_list):
 550                 if isinstance(info.get(info_f), (compat_str, compat_numeric_types)):
 551                     for meta_f in variadic(meta_list):
 552                         metadata[meta_f] = info[info_f]
 553                     break
 554
 555         # See [1-4] for some info on media metadata/metadata supported
 556         # by ffmpeg.
 557         # 1. https://kdenlive.org/en/project/adding-meta-data-to-mp4-video/
 558         # 2. https://wiki.multimedia.cx/index.php/FFmpeg_Metadata
 559         # 3. https://kodi.wiki/view/Video_file_tagging
 560
 561         add('title', ('track', 'title'))
 562         add('date', 'upload_date')
 563         add(('description', 'synopsis'), 'description')
 564         add(('purl', 'comment'), 'webpage_url')
 565         add('track', 'track_number')
 566         add('artist', ('artist', 'creator', 'uploader', 'uploader_id'))
 567         add('genre')
 568         add('album')
 569         add('album_artist')
 570         add('disc', 'disc_number')
 571         add('show', 'series')
 572         add('season_number')
 573         add('episode_id', ('episode', 'episode_id'))
 574         add('episode_sort', 'episode_number')
 575
 576         prefix = 'meta_'
 577         for key in filter(lambda k: k.startswith(prefix), info.keys()):
 578             add(key[len(prefix):], key)
 579
 580         filename, metadata_filename = info['filepath'], None
 581         options = [('-metadata', f'{name}={value}') for name, value in metadata.items()]
 582
 583         stream_idx = 0
 584         for fmt in info.get('requested_formats') or []:
 585             stream_count = 2 if 'none' not in (fmt.get('vcodec'), fmt.get('acodec')) else 1
 586             if fmt.get('language'):
 587                 lang = ISO639Utils.short2long(fmt['language']) or fmt['language']
 588                 options.extend(('-metadata:s:%d' % (stream_idx + i), 'language=%s' % lang)
 589                                for i in range(stream_count))
 590             stream_idx += stream_count
 591
 592         chapters = info.get('chapters', [])
 593         if chapters:
 594             metadata_filename = replace_extension(filename, 'meta')
 595             with io.open(metadata_filename, 'wt', encoding='utf-8') as f:
 596                 def ffmpeg_escape(text):
 597                     return re.sub(r'([\\=;#\n])', r'\\\1', text)
 598
 599                 metadata_file_content = ';FFMETADATA1\n'
 600                 for chapter in chapters:
 601                     metadata_file_content += '[CHAPTER]\nTIMEBASE=1/1000\n'
 602                     metadata_file_content += 'START=%d\n' % (chapter['start_time'] * 1000)
 603                     metadata_file_content += 'END=%d\n' % (chapter['end_time'] * 1000)
 604                     chapter_title = chapter.get('title')
 605                     if chapter_title:
 606                         metadata_file_content += 'title=%s\n' % ffmpeg_escape(chapter_title)
 607                 f.write(metadata_file_content)
 608                 options.append(('-map_metadata', '1'))
 609
 610         if ('no-attach-info-json' not in self.get_param('compat_opts', [])
 611                 and '__infojson_filename' in info and info['ext'] in ('mkv', 'mka')):
 612             old_stream, new_stream = self.get_stream_number(filename, ('tags', 'mimetype'), 'application/json')
 613             if old_stream is not None:
 614                 options.append(('-map', '-0:%d' % old_stream))
 615                 new_stream -= 1
 616
 617             options.append((
 618                 '-attach', info['__infojson_filename'],
 619                 '-metadata:s:%d' % new_stream, 'mimetype=application/json'
 620             ))
 621
 622         if not options:
 623             self.to_screen('There isn\'t any metadata to add')
 624             return [], info
 625
 626         temp_filename = prepend_extension(filename, 'temp')
 627         self.to_screen('Adding metadata to "%s"' % filename)
 628         self.run_ffmpeg_multiple_files(
 629             (filename, metadata_filename), temp_filename,
 630             itertools.chain(self._options(info['ext']), *options))
 631         if chapters:
 632             os.remove(metadata_filename)
 633         os.replace(temp_filename, filename)
 634         return [], info
 635
 636
 637 class FFmpegMergerPP(FFmpegPostProcessor):
 638     @PostProcessor._restrict_to(images=False)
 639     def run(self, info):
 640         filename = info['filepath']
 641         temp_filename = prepend_extension(filename, 'temp')
 642         args = ['-c', 'copy']
 643         for (i, fmt) in enumerate(info['requested_formats']):
 644             if fmt.get('acodec') != 'none':
 645                 args.extend(['-map', '%u:a:0' % (i)])
 646             if fmt.get('vcodec') != 'none':
 647                 args.extend(['-map', '%u:v:0' % (i)])
 648         self.to_screen('Merging formats into "%s"' % filename)
 649         self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
 650         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 651         return info['__files_to_merge'], info
 652
 653     def can_merge(self):
 654         # TODO: figure out merge-capable ffmpeg version
 655         if self.basename != 'avconv':
 656             return True
 657
 658         required_version = '10-0'
 659         if is_outdated_version(
 660                 self._versions[self.basename], required_version):
 661             warning = ('Your copy of %s is outdated and unable to properly mux separate video and audio files, '
 662                        'yt-dlp will download single file media. '
 663                        'Update %s to version %s or newer to fix this.') % (
 664                            self.basename, self.basename, required_version)
 665             self.report_warning(warning)
 666             return False
 667         return True
 668
 669
 670 class FFmpegFixupPostProcessor(FFmpegPostProcessor):
 671     def _fixup(self, msg, filename, options):
 672         temp_filename = prepend_extension(filename, 'temp')
 673
 674         self.to_screen(f'{msg} of "{filename}"')
 675         self.run_ffmpeg(filename, temp_filename, options)
 676
 677         os.replace(temp_filename, filename)
 678
 679
 680 class FFmpegFixupStretchedPP(FFmpegFixupPostProcessor):
 681     @PostProcessor._restrict_to(images=False, audio=False)
 682     def run(self, info):
 683         stretched_ratio = info.get('stretched_ratio')
 684         if stretched_ratio not in (None, 1):
 685             self._fixup('Fixing aspect ratio', info['filepath'], [
 686                 '-c', 'copy', '-map', '0', '-dn', '-aspect', '%f' % stretched_ratio])
 687         return [], info
 688
 689
 690 class FFmpegFixupM4aPP(FFmpegFixupPostProcessor):
 691     @PostProcessor._restrict_to(images=False, video=False)
 692     def run(self, info):
 693         if info.get('container') == 'm4a_dash':
 694             self._fixup('Correcting container', info['filepath'], [
 695                 '-c', 'copy', '-map', '0', '-dn', '-f', 'mp4'])
 696         return [], info
 697
 698
 699 class FFmpegFixupM3u8PP(FFmpegFixupPostProcessor):
 700     @PostProcessor._restrict_to(images=False)
 701     def run(self, info):
 702         if self.get_audio_codec(info['filepath']) == 'aac':
 703             self._fixup('Fixing malformed AAC bitstream', info['filepath'], [
 704                 '-c', 'copy', '-map', '0', '-dn', '-f', 'mp4', '-bsf:a', 'aac_adtstoasc'])
 705         return [], info
 706
 707
 708 class FFmpegFixupTimestampPP(FFmpegFixupPostProcessor):
 709
 710     def __init__(self, downloader=None, trim=0.001):
 711         # "trim" should be used when the video contains unintended packets
 712         super(FFmpegFixupTimestampPP, self).__init__(downloader)
 713         assert isinstance(trim, (int, float))
 714         self.trim = str(trim)
 715
 716     @PostProcessor._restrict_to(images=False)
 717     def run(self, info):
 718         required_version = '4.4'
 719         if is_outdated_version(self._versions[self.basename], required_version):
 720             self.report_warning(
 721                 'A re-encode is needed to fix timestamps in older versions of ffmpeg. '
 722                 f'Please install ffmpeg {required_version} or later to fixup without re-encoding')
 723             opts = ['-vf', 'setpts=PTS-STARTPTS']
 724         else:
 725             opts = ['-c', 'copy', '-bsf', 'setts=ts=TS-STARTPTS']
 726         self._fixup('Fixing frame timestamp', info['filepath'], opts + ['-map', '0', '-dn', '-ss', self.trim])
 727         return [], info
 728
 729
 730 class FFmpegFixupDurationPP(FFmpegFixupPostProcessor):
 731     @PostProcessor._restrict_to(images=False)
 732     def run(self, info):
 733         self._fixup('Fixing video duration', info['filepath'], ['-c', 'copy', '-map', '0', '-dn'])
 734         return [], info
 735
 736
 737 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 738     SUPPORTED_EXTS = ('srt', 'vtt', 'ass', 'lrc')
 739
 740     def __init__(self, downloader=None, format=None):
 741         super(FFmpegSubtitlesConvertorPP, self).__init__(downloader)
 742         self.format = format
 743
 744     def run(self, info):
 745         subs = info.get('requested_subtitles')
 746         new_ext = self.format
 747         new_format = new_ext
 748         if new_format == 'vtt':
 749             new_format = 'webvtt'
 750         if subs is None:
 751             self.to_screen('There aren\'t any subtitles to convert')
 752             return [], info
 753         self.to_screen('Converting subtitles')
 754         sub_filenames = []
 755         for lang, sub in subs.items():
 756             ext = sub['ext']
 757             if ext == new_ext:
 758                 self.to_screen('Subtitle file for %s is already in the requested format' % new_ext)
 759                 continue
 760             elif ext == 'json':
 761                 self.to_screen(
 762                     'You have requested to convert json subtitles into another format, '
 763                     'which is currently not possible')
 764                 continue
 765             old_file = sub['filepath']
 766             sub_filenames.append(old_file)
 767             new_file = replace_extension(old_file, new_ext)
 768
 769             if ext in ('dfxp', 'ttml', 'tt'):
 770                 self.report_warning(
 771                     'You have requested to convert dfxp (TTML) subtitles into another format, '
 772                     'which results in style information loss')
 773
 774                 dfxp_file = old_file
 775                 srt_file = replace_extension(old_file, 'srt')
 776
 777                 with open(dfxp_file, 'rb') as f:
 778                     srt_data = dfxp2srt(f.read())
 779
 780                 with io.open(srt_file, 'wt', encoding='utf-8') as f:
 781                     f.write(srt_data)
 782                 old_file = srt_file
 783
 784                 subs[lang] = {
 785                     'ext': 'srt',
 786                     'data': srt_data,
 787                     'filepath': srt_file,
 788                 }
 789
 790                 if new_ext == 'srt':
 791                     continue
 792                 else:
 793                     sub_filenames.append(srt_file)
 794
 795             self.run_ffmpeg(old_file, new_file, ['-f', new_format])
 796
 797             with io.open(new_file, 'rt', encoding='utf-8') as f:
 798                 subs[lang] = {
 799                     'ext': new_ext,
 800                     'data': f.read(),
 801                     'filepath': new_file,
 802                 }
 803
 804             info['__files_to_move'][new_file] = replace_extension(
 805                 info['__files_to_move'][sub['filepath']], new_ext)
 806
 807         return sub_filenames, info
 808
 809
 810 class FFmpegSplitChaptersPP(FFmpegPostProcessor):
 811
 812     def _prepare_filename(self, number, chapter, info):
 813         info = info.copy()
 814         info.update({
 815             'section_number': number,
 816             'section_title': chapter.get('title'),
 817             'section_start': chapter.get('start_time'),
 818             'section_end': chapter.get('end_time'),
 819         })
 820         return self._downloader.prepare_filename(info, 'chapter')
 821
 822     def _ffmpeg_args_for_chapter(self, number, chapter, info):
 823         destination = self._prepare_filename(number, chapter, info)
 824         if not self._downloader._ensure_dir_exists(encodeFilename(destination)):
 825             return
 826
 827         chapter['filepath'] = destination
 828         self.to_screen('Chapter %03d; Destination: %s' % (number, destination))
 829         return (
 830             destination,
 831             ['-ss', compat_str(chapter['start_time']),
 832              '-t', compat_str(chapter['end_time'] - chapter['start_time'])])
 833
 834     @PostProcessor._restrict_to(images=False)
 835     def run(self, info):
 836         chapters = info.get('chapters') or []
 837         if not chapters:
 838             self.report_warning('Chapter information is unavailable')
 839             return [], info
 840
 841         self.to_screen('Splitting video by chapters; %d chapters found' % len(chapters))
 842         for idx, chapter in enumerate(chapters):
 843             destination, opts = self._ffmpeg_args_for_chapter(idx + 1, chapter, info)
 844             self.real_run_ffmpeg([(info['filepath'], opts)], [(destination, ['-c', 'copy'])])
 845         return [], info
 846
 847
 848 class FFmpegThumbnailsConvertorPP(FFmpegPostProcessor):
 849     SUPPORTED_EXTS = ('jpg', 'png')
 850
 851     def __init__(self, downloader=None, format=None):
 852         super(FFmpegThumbnailsConvertorPP, self).__init__(downloader)
 853         self.format = format
 854
 855     @staticmethod
 856     def is_webp(path):
 857         with open(encodeFilename(path), 'rb') as f:
 858             b = f.read(12)
 859         return b[0:4] == b'RIFF' and b[8:] == b'WEBP'
 860
 861     def fixup_webp(self, info, idx=-1):
 862         thumbnail_filename = info['thumbnails'][idx]['filepath']
 863         _, thumbnail_ext = os.path.splitext(thumbnail_filename)
 864         if thumbnail_ext:
 865             thumbnail_ext = thumbnail_ext[1:].lower()
 866             if thumbnail_ext != 'webp' and self.is_webp(thumbnail_filename):
 867                 self.to_screen('Correcting thumbnail "%s" extension to webp' % thumbnail_filename)
 868                 webp_filename = replace_extension(thumbnail_filename, 'webp')
 869                 os.replace(thumbnail_filename, webp_filename)
 870                 info['thumbnails'][idx]['filepath'] = webp_filename
 871                 info['__files_to_move'][webp_filename] = replace_extension(
 872                     info['__files_to_move'].pop(thumbnail_filename), 'webp')
 873
 874     @staticmethod
 875     def _options(target_ext):
 876         if target_ext == 'jpg':
 877             return ['-bsf:v', 'mjpeg2jpeg']
 878         return []
 879
 880     def convert_thumbnail(self, thumbnail_filename, target_ext):
 881         thumbnail_conv_filename = replace_extension(thumbnail_filename, target_ext)
 882
 883         self.to_screen('Converting thumbnail "%s" to %s' % (thumbnail_filename, target_ext))
 884         self.real_run_ffmpeg(
 885             [(thumbnail_filename, ['-f', 'image2', '-pattern_type', 'none'])],
 886             [(thumbnail_conv_filename.replace('%', '%%'), self._options(target_ext))])
 887         return thumbnail_conv_filename
 888
 889     def run(self, info):
 890         files_to_delete = []
 891         has_thumbnail = False
 892
 893         for idx, thumbnail_dict in enumerate(info['thumbnails']):
 894             if 'filepath' not in thumbnail_dict:
 895                 continue
 896             has_thumbnail = True
 897             self.fixup_webp(info, idx)
 898             original_thumbnail = thumbnail_dict['filepath']
 899             _, thumbnail_ext = os.path.splitext(original_thumbnail)
 900             if thumbnail_ext:
 901                 thumbnail_ext = thumbnail_ext[1:].lower()
 902             if thumbnail_ext == 'jpeg':
 903                 thumbnail_ext = 'jpg'
 904             if thumbnail_ext == self.format:
 905                 self.to_screen('Thumbnail "%s" is already in the requested format' % original_thumbnail)
 906                 continue
 907             thumbnail_dict['filepath'] = self.convert_thumbnail(original_thumbnail, self.format)
 908             files_to_delete.append(original_thumbnail)
 909             info['__files_to_move'][thumbnail_dict['filepath']] = replace_extension(
 910                 info['__files_to_move'][original_thumbnail], self.format)
 911
 912         if not has_thumbnail:
 913             self.to_screen('There aren\'t any thumbnails to convert')
 914         return files_to_delete, info