youtube_dl/postprocessor/ffmpeg.py

   1 from __future__ import unicode_literals
   2
   3 import io
   4 import os
   5 import subprocess
   6 import time
   7
   8
   9 from .common import AudioConversionError, PostProcessor
  10
  11 from ..compat import (
  12     compat_subprocess_get_DEVNULL,
  13 )
  14 from ..utils import (
  15     encodeArgument,
  16     encodeFilename,
  17     get_exe_version,
  18     is_outdated_version,
  19     PostProcessingError,
  20     prepend_extension,
  21     shell_quote,
  22     subtitles_filename,
  23 )
  24
  25
  26 class FFmpegPostProcessorError(PostProcessingError):
  27     pass
  28
  29
  30 class FFmpegPostProcessor(PostProcessor):
  31     def __init__(self, downloader=None, deletetempfiles=False):
  32         PostProcessor.__init__(self, downloader)
  33         self._deletetempfiles = deletetempfiles
  34         self._determine_executables()
  35
  36     def check_version(self):
  37         if not self.available:
  38             raise FFmpegPostProcessorError('ffmpeg or avconv not found. Please install one.')
  39
  40         required_version = '10-0' if self.basename == 'avconv' else '1.0'
  41         if is_outdated_version(
  42                 self._versions[self.basename], required_version):
  43             warning = 'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.' % (
  44                 self.basename, self.basename, required_version)
  45             if self._downloader:
  46                 self._downloader.report_warning(warning)
  47
  48     @staticmethod
  49     def get_versions(downloader=None):
  50         return FFmpegPostProcessor(downloader)._versions
  51
  52     def _determine_executables(self):
  53         programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe']
  54         prefer_ffmpeg = self._downloader.params.get('prefer_ffmpeg', False)
  55
  56         self.basename = None
  57         self.probe_basename = None
  58
  59         self._paths = None
  60         self._versions = None
  61         if self._downloader:
  62             location = self._downloader.params.get('ffmpeg_location')
  63             if location is not None:
  64                 if not os.path.exists(location):
  65                     self._downloader.report_warning(
  66                         'ffmpeg-location %s does not exist! '
  67                         'Continuing without avconv/ffmpeg.' % (location))
  68                     self._versions = {}
  69                     return
  70                 elif not os.path.isdir(location):
  71                     basename = os.path.splitext(os.path.basename(location))[0]
  72                     if basename not in programs:
  73                         self._downloader.report_warning(
  74                             'Cannot identify executable %s, its basename should be one of %s. '
  75                             'Continuing without avconv/ffmpeg.' %
  76                             (location, ', '.join(programs)))
  77                         self._versions = {}
  78                         return None
  79                     location = os.path.dirname(os.path.abspath(location))
  80                     if basename in ('ffmpeg', 'ffprobe'):
  81                         prefer_ffmpeg = True
  82
  83                 self._paths = dict(
  84                     (p, os.path.join(location, p)) for p in programs)
  85                 self._versions = dict(
  86                     (p, get_exe_version(self._paths[p], args=['-version']))
  87                     for p in programs)
  88         if self._versions is None:
  89             self._versions = dict(
  90                 (p, get_exe_version(p, args=['-version'])) for p in programs)
  91             self._paths = dict((p, p) for p in programs)
  92
  93         if prefer_ffmpeg:
  94             prefs = ('ffmpeg', 'avconv')
  95         else:
  96             prefs = ('avconv', 'ffmpeg')
  97         for p in prefs:
  98             if self._versions[p]:
  99                 self.basename = p
 100                 break
 101
 102         if prefer_ffmpeg:
 103             prefs = ('ffprobe', 'avprobe')
 104         else:
 105             prefs = ('avprobe', 'ffprobe')
 106         for p in prefs:
 107             if self._versions[p]:
 108                 self.probe_basename = p
 109                 break
 110
 111     @property
 112     def available(self):
 113         return self.basename is not None
 114
 115     @property
 116     def executable(self):
 117         return self._paths[self.basename]
 118
 119     @property
 120     def probe_available(self):
 121         return self.probe_basename is not None
 122
 123     @property
 124     def probe_executable(self):
 125         return self._paths[self.probe_basename]
 126
 127     def run_ffmpeg_multiple_files(self, input_paths, out_path, opts):
 128         self.check_version()
 129
 130         oldest_mtime = min(
 131             os.stat(encodeFilename(path)).st_mtime for path in input_paths)
 132
 133         files_cmd = []
 134         for path in input_paths:
 135             files_cmd.extend([encodeArgument('-i'), encodeFilename(path, True)])
 136         cmd = ([encodeFilename(self.executable, True), encodeArgument('-y')] +
 137                files_cmd +
 138                [encodeArgument(o) for o in opts] +
 139                [encodeFilename(self._ffmpeg_filename_argument(out_path), True)])
 140
 141         if self._downloader.params.get('verbose', False):
 142             self._downloader.to_screen('[debug] ffmpeg command line: %s' % shell_quote(cmd))
 143         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 144         stdout, stderr = p.communicate()
 145         if p.returncode != 0:
 146             stderr = stderr.decode('utf-8', 'replace')
 147             msg = stderr.strip().split('\n')[-1]
 148             raise FFmpegPostProcessorError(msg)
 149         try:
 150             os.utime(encodeFilename(out_path), (oldest_mtime, oldest_mtime))
 151         except Exception:
 152             self._downloader.report_warning('Cannot update utime of file')
 153
 154         if self._deletetempfiles:
 155             for ipath in input_paths:
 156                 os.remove(ipath)
 157
 158     def run_ffmpeg(self, path, out_path, opts):
 159         self.run_ffmpeg_multiple_files([path], out_path, opts)
 160
 161     def _ffmpeg_filename_argument(self, fn):
 162         # ffmpeg broke --, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details
 163         if fn.startswith('-'):
 164             return './' + fn
 165         return fn
 166
 167
 168 class FFmpegExtractAudioPP(FFmpegPostProcessor):
 169     def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
 170         FFmpegPostProcessor.__init__(self, downloader)
 171         if preferredcodec is None:
 172             preferredcodec = 'best'
 173         self._preferredcodec = preferredcodec
 174         self._preferredquality = preferredquality
 175         self._nopostoverwrites = nopostoverwrites
 176
 177     def get_audio_codec(self, path):
 178
 179         if not self.probe_available:
 180             raise PostProcessingError('ffprobe or avprobe not found. Please install one.')
 181         try:
 182             cmd = [
 183                 encodeFilename(self.probe_executable, True),
 184                 encodeArgument('-show_streams'),
 185                 encodeFilename(self._ffmpeg_filename_argument(path), True)]
 186             if self._downloader.params.get('verbose', False):
 187                 self._downloader.to_screen('[debug] %s command line: %s' % (self.basename, shell_quote(cmd)))
 188             handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)
 189             output = handle.communicate()[0]
 190             if handle.wait() != 0:
 191                 return None
 192         except (IOError, OSError):
 193             return None
 194         audio_codec = None
 195         for line in output.decode('ascii', 'ignore').split('\n'):
 196             if line.startswith('codec_name='):
 197                 audio_codec = line.split('=')[1].strip()
 198             elif line.strip() == 'codec_type=audio' and audio_codec is not None:
 199                 return audio_codec
 200         return None
 201
 202     def run_ffmpeg(self, path, out_path, codec, more_opts):
 203         if codec is None:
 204             acodec_opts = []
 205         else:
 206             acodec_opts = ['-acodec', codec]
 207         opts = ['-vn'] + acodec_opts + more_opts
 208         try:
 209             FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
 210         except FFmpegPostProcessorError as err:
 211             raise AudioConversionError(err.msg)
 212
 213     def run(self, information):
 214         path = information['filepath']
 215
 216         filecodec = self.get_audio_codec(path)
 217         if filecodec is None:
 218             raise PostProcessingError('WARNING: unable to obtain file audio codec with ffprobe')
 219
 220         more_opts = []
 221         if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
 222             if filecodec == 'aac' and self._preferredcodec in ['m4a', 'best']:
 223                 # Lossless, but in another container
 224                 acodec = 'copy'
 225                 extension = 'm4a'
 226                 more_opts = ['-bsf:a', 'aac_adtstoasc']
 227             elif filecodec in ['aac', 'mp3', 'vorbis', 'opus']:
 228                 # Lossless if possible
 229                 acodec = 'copy'
 230                 extension = filecodec
 231                 if filecodec == 'aac':
 232                     more_opts = ['-f', 'adts']
 233                 if filecodec == 'vorbis':
 234                     extension = 'ogg'
 235             else:
 236                 # MP3 otherwise.
 237                 acodec = 'libmp3lame'
 238                 extension = 'mp3'
 239                 more_opts = []
 240                 if self._preferredquality is not None:
 241                     if int(self._preferredquality) < 10:
 242                         more_opts += ['-q:a', self._preferredquality]
 243                     else:
 244                         more_opts += ['-b:a', self._preferredquality + 'k']
 245         else:
 246             # We convert the audio (lossy)
 247             acodec = {'mp3': 'libmp3lame', 'aac': 'aac', 'm4a': 'aac', 'opus': 'opus', 'vorbis': 'libvorbis', 'wav': None}[self._preferredcodec]
 248             extension = self._preferredcodec
 249             more_opts = []
 250             if self._preferredquality is not None:
 251                 # The opus codec doesn't support the -aq option
 252                 if int(self._preferredquality) < 10 and extension != 'opus':
 253                     more_opts += ['-q:a', self._preferredquality]
 254                 else:
 255                     more_opts += ['-b:a', self._preferredquality + 'k']
 256             if self._preferredcodec == 'aac':
 257                 more_opts += ['-f', 'adts']
 258             if self._preferredcodec == 'm4a':
 259                 more_opts += ['-bsf:a', 'aac_adtstoasc']
 260             if self._preferredcodec == 'vorbis':
 261                 extension = 'ogg'
 262             if self._preferredcodec == 'wav':
 263                 extension = 'wav'
 264                 more_opts += ['-f', 'wav']
 265
 266         prefix, sep, ext = path.rpartition('.')  # not os.path.splitext, since the latter does not work on unicode in all setups
 267         new_path = prefix + sep + extension
 268
 269         # If we download foo.mp3 and convert it to... foo.mp3, then don't delete foo.mp3, silly.
 270         if new_path == path:
 271             self._nopostoverwrites = True
 272
 273         try:
 274             if self._nopostoverwrites and os.path.exists(encodeFilename(new_path)):
 275                 self._downloader.to_screen('[youtube] Post-process file %s exists, skipping' % new_path)
 276             else:
 277                 self._downloader.to_screen('[' + self.basename + '] Destination: ' + new_path)
 278                 self.run_ffmpeg(path, new_path, acodec, more_opts)
 279         except AudioConversionError as e:
 280             raise PostProcessingError(
 281                 'audio conversion failed: ' + e.msg)
 282         except Exception:
 283             raise PostProcessingError('error running ' + self.basename)
 284
 285         # Try to update the date time for extracted audio file.
 286         if information.get('filetime') is not None:
 287             try:
 288                 os.utime(encodeFilename(new_path), (time.time(), information['filetime']))
 289             except Exception:
 290                 self._downloader.report_warning('Cannot update utime of audio file')
 291
 292         information['filepath'] = new_path
 293         return self._nopostoverwrites, information
 294
 295
 296 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 297     def __init__(self, downloader=None, preferedformat=None):
 298         super(FFmpegVideoConvertorPP, self).__init__(downloader)
 299         self._preferedformat = preferedformat
 300
 301     def run(self, information):
 302         path = information['filepath']
 303         prefix, sep, ext = path.rpartition('.')
 304         outpath = prefix + sep + self._preferedformat
 305         if information['ext'] == self._preferedformat:
 306             self._downloader.to_screen('[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
 307             return True, information
 308         self._downloader.to_screen('[' + 'ffmpeg' + '] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
 309         self.run_ffmpeg(path, outpath, [])
 310         information['filepath'] = outpath
 311         information['format'] = self._preferedformat
 312         information['ext'] = self._preferedformat
 313         return False, information
 314
 315
 316 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 317     # See http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt
 318     _lang_map = {
 319         'aa': 'aar',
 320         'ab': 'abk',
 321         'ae': 'ave',
 322         'af': 'afr',
 323         'ak': 'aka',
 324         'am': 'amh',
 325         'an': 'arg',
 326         'ar': 'ara',
 327         'as': 'asm',
 328         'av': 'ava',
 329         'ay': 'aym',
 330         'az': 'aze',
 331         'ba': 'bak',
 332         'be': 'bel',
 333         'bg': 'bul',
 334         'bh': 'bih',
 335         'bi': 'bis',
 336         'bm': 'bam',
 337         'bn': 'ben',
 338         'bo': 'bod',
 339         'br': 'bre',
 340         'bs': 'bos',
 341         'ca': 'cat',
 342         'ce': 'che',
 343         'ch': 'cha',
 344         'co': 'cos',
 345         'cr': 'cre',
 346         'cs': 'ces',
 347         'cu': 'chu',
 348         'cv': 'chv',
 349         'cy': 'cym',
 350         'da': 'dan',
 351         'de': 'deu',
 352         'dv': 'div',
 353         'dz': 'dzo',
 354         'ee': 'ewe',
 355         'el': 'ell',
 356         'en': 'eng',
 357         'eo': 'epo',
 358         'es': 'spa',
 359         'et': 'est',
 360         'eu': 'eus',
 361         'fa': 'fas',
 362         'ff': 'ful',
 363         'fi': 'fin',
 364         'fj': 'fij',
 365         'fo': 'fao',
 366         'fr': 'fra',
 367         'fy': 'fry',
 368         'ga': 'gle',
 369         'gd': 'gla',
 370         'gl': 'glg',
 371         'gn': 'grn',
 372         'gu': 'guj',
 373         'gv': 'glv',
 374         'ha': 'hau',
 375         'he': 'heb',
 376         'hi': 'hin',
 377         'ho': 'hmo',
 378         'hr': 'hrv',
 379         'ht': 'hat',
 380         'hu': 'hun',
 381         'hy': 'hye',
 382         'hz': 'her',
 383         'ia': 'ina',
 384         'id': 'ind',
 385         'ie': 'ile',
 386         'ig': 'ibo',
 387         'ii': 'iii',
 388         'ik': 'ipk',
 389         'io': 'ido',
 390         'is': 'isl',
 391         'it': 'ita',
 392         'iu': 'iku',
 393         'ja': 'jpn',
 394         'jv': 'jav',
 395         'ka': 'kat',
 396         'kg': 'kon',
 397         'ki': 'kik',
 398         'kj': 'kua',
 399         'kk': 'kaz',
 400         'kl': 'kal',
 401         'km': 'khm',
 402         'kn': 'kan',
 403         'ko': 'kor',
 404         'kr': 'kau',
 405         'ks': 'kas',
 406         'ku': 'kur',
 407         'kv': 'kom',
 408         'kw': 'cor',
 409         'ky': 'kir',
 410         'la': 'lat',
 411         'lb': 'ltz',
 412         'lg': 'lug',
 413         'li': 'lim',
 414         'ln': 'lin',
 415         'lo': 'lao',
 416         'lt': 'lit',
 417         'lu': 'lub',
 418         'lv': 'lav',
 419         'mg': 'mlg',
 420         'mh': 'mah',
 421         'mi': 'mri',
 422         'mk': 'mkd',
 423         'ml': 'mal',
 424         'mn': 'mon',
 425         'mr': 'mar',
 426         'ms': 'msa',
 427         'mt': 'mlt',
 428         'my': 'mya',
 429         'na': 'nau',
 430         'nb': 'nob',
 431         'nd': 'nde',
 432         'ne': 'nep',
 433         'ng': 'ndo',
 434         'nl': 'nld',
 435         'nn': 'nno',
 436         'no': 'nor',
 437         'nr': 'nbl',
 438         'nv': 'nav',
 439         'ny': 'nya',
 440         'oc': 'oci',
 441         'oj': 'oji',
 442         'om': 'orm',
 443         'or': 'ori',
 444         'os': 'oss',
 445         'pa': 'pan',
 446         'pi': 'pli',
 447         'pl': 'pol',
 448         'ps': 'pus',
 449         'pt': 'por',
 450         'qu': 'que',
 451         'rm': 'roh',
 452         'rn': 'run',
 453         'ro': 'ron',
 454         'ru': 'rus',
 455         'rw': 'kin',
 456         'sa': 'san',
 457         'sc': 'srd',
 458         'sd': 'snd',
 459         'se': 'sme',
 460         'sg': 'sag',
 461         'si': 'sin',
 462         'sk': 'slk',
 463         'sl': 'slv',
 464         'sm': 'smo',
 465         'sn': 'sna',
 466         'so': 'som',
 467         'sq': 'sqi',
 468         'sr': 'srp',
 469         'ss': 'ssw',
 470         'st': 'sot',
 471         'su': 'sun',
 472         'sv': 'swe',
 473         'sw': 'swa',
 474         'ta': 'tam',
 475         'te': 'tel',
 476         'tg': 'tgk',
 477         'th': 'tha',
 478         'ti': 'tir',
 479         'tk': 'tuk',
 480         'tl': 'tgl',
 481         'tn': 'tsn',
 482         'to': 'ton',
 483         'tr': 'tur',
 484         'ts': 'tso',
 485         'tt': 'tat',
 486         'tw': 'twi',
 487         'ty': 'tah',
 488         'ug': 'uig',
 489         'uk': 'ukr',
 490         'ur': 'urd',
 491         'uz': 'uzb',
 492         've': 'ven',
 493         'vi': 'vie',
 494         'vo': 'vol',
 495         'wa': 'wln',
 496         'wo': 'wol',
 497         'xh': 'xho',
 498         'yi': 'yid',
 499         'yo': 'yor',
 500         'za': 'zha',
 501         'zh': 'zho',
 502         'zu': 'zul',
 503     }
 504
 505     @classmethod
 506     def _conver_lang_code(cls, code):
 507         """Convert language code from ISO 639-1 to ISO 639-2/T"""
 508         return cls._lang_map.get(code[:2])
 509
 510     def run(self, information):
 511         if information['ext'] != 'mp4':
 512             self._downloader.to_screen('[ffmpeg] Subtitles can only be embedded in mp4 files')
 513             return True, information
 514         subtitles = information.get('requested_subtitles')
 515         if not subtitles:
 516             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to embed')
 517             return True, information
 518
 519         sub_langs = list(subtitles.keys())
 520         filename = information['filepath']
 521         input_files = [filename] + [subtitles_filename(filename, lang, sub_info['ext']) for lang, sub_info in subtitles.items()]
 522
 523         opts = [
 524             '-map', '0',
 525             '-c', 'copy',
 526             # Don't copy the existing subtitles, we may be running the
 527             # postprocessor a second time
 528             '-map', '-0:s',
 529             '-c:s', 'mov_text',
 530         ]
 531         for (i, lang) in enumerate(sub_langs):
 532             opts.extend(['-map', '%d:0' % (i + 1)])
 533             lang_code = self._conver_lang_code(lang)
 534             if lang_code is not None:
 535                 opts.extend(['-metadata:s:s:%d' % i, 'language=%s' % lang_code])
 536
 537         temp_filename = prepend_extension(filename, 'temp')
 538         self._downloader.to_screen('[ffmpeg] Embedding subtitles in \'%s\'' % filename)
 539         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
 540         os.remove(encodeFilename(filename))
 541         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 542
 543         return True, information
 544
 545
 546 class FFmpegMetadataPP(FFmpegPostProcessor):
 547     def run(self, info):
 548         metadata = {}
 549         if info.get('title') is not None:
 550             metadata['title'] = info['title']
 551         if info.get('upload_date') is not None:
 552             metadata['date'] = info['upload_date']
 553         if info.get('artist') is not None:
 554             metadata['artist'] = info['artist']
 555         elif info.get('uploader') is not None:
 556             metadata['artist'] = info['uploader']
 557         elif info.get('uploader_id') is not None:
 558             metadata['artist'] = info['uploader_id']
 559         if info.get('description') is not None:
 560             metadata['description'] = info['description']
 561             metadata['comment'] = info['description']
 562         if info.get('webpage_url') is not None:
 563             metadata['purl'] = info['webpage_url']
 564         if info.get('album') is not None:
 565             metadata['album'] = info['album']
 566
 567         if not metadata:
 568             self._downloader.to_screen('[ffmpeg] There isn\'t any metadata to add')
 569             return True, info
 570
 571         filename = info['filepath']
 572         temp_filename = prepend_extension(filename, 'temp')
 573
 574         if info['ext'] == 'm4a':
 575             options = ['-vn', '-acodec', 'copy']
 576         else:
 577             options = ['-c', 'copy']
 578
 579         for (name, value) in metadata.items():
 580             options.extend(['-metadata', '%s=%s' % (name, value)])
 581
 582         self._downloader.to_screen('[ffmpeg] Adding metadata to \'%s\'' % filename)
 583         self.run_ffmpeg(filename, temp_filename, options)
 584         os.remove(encodeFilename(filename))
 585         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 586         return True, info
 587
 588
 589 class FFmpegMergerPP(FFmpegPostProcessor):
 590     def run(self, info):
 591         filename = info['filepath']
 592         args = ['-c', 'copy', '-map', '0:v:0', '-map', '1:a:0']
 593         self._downloader.to_screen('[ffmpeg] Merging formats into "%s"' % filename)
 594         self.run_ffmpeg_multiple_files(info['__files_to_merge'], filename, args)
 595         return True, info
 596
 597
 598 class FFmpegAudioFixPP(FFmpegPostProcessor):
 599     def run(self, info):
 600         filename = info['filepath']
 601         temp_filename = prepend_extension(filename, 'temp')
 602
 603         options = ['-vn', '-acodec', 'copy']
 604         self._downloader.to_screen('[ffmpeg] Fixing audio file "%s"' % filename)
 605         self.run_ffmpeg(filename, temp_filename, options)
 606
 607         os.remove(encodeFilename(filename))
 608         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 609
 610         return True, info
 611
 612
 613 class FFmpegFixupStretchedPP(FFmpegPostProcessor):
 614     def run(self, info):
 615         stretched_ratio = info.get('stretched_ratio')
 616         if stretched_ratio is None or stretched_ratio == 1:
 617             return True, info
 618
 619         filename = info['filepath']
 620         temp_filename = prepend_extension(filename, 'temp')
 621
 622         options = ['-c', 'copy', '-aspect', '%f' % stretched_ratio]
 623         self._downloader.to_screen('[ffmpeg] Fixing aspect ratio in "%s"' % filename)
 624         self.run_ffmpeg(filename, temp_filename, options)
 625
 626         os.remove(encodeFilename(filename))
 627         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 628
 629         return True, info
 630
 631
 632 class FFmpegFixupM4aPP(FFmpegPostProcessor):
 633     def run(self, info):
 634         if info.get('container') != 'm4a_dash':
 635             return True, info
 636
 637         filename = info['filepath']
 638         temp_filename = prepend_extension(filename, 'temp')
 639
 640         options = ['-c', 'copy', '-f', 'mp4']
 641         self._downloader.to_screen('[ffmpeg] Correcting container in "%s"' % filename)
 642         self.run_ffmpeg(filename, temp_filename, options)
 643
 644         os.remove(encodeFilename(filename))
 645         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 646
 647         return True, info
 648
 649
 650 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 651     def __init__(self, downloader=None, format=None):
 652         super(FFmpegSubtitlesConvertorPP, self).__init__(downloader)
 653         self.format = format
 654
 655     def run(self, info):
 656         subs = info.get('requested_subtitles')
 657         filename = info['filepath']
 658         new_ext = self.format
 659         new_format = new_ext
 660         if new_format == 'vtt':
 661             new_format = 'webvtt'
 662         if subs is None:
 663             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to convert')
 664             return True, info
 665         self._downloader.to_screen('[ffmpeg] Converting subtitles')
 666         for lang, sub in subs.items():
 667             ext = sub['ext']
 668             if ext == new_ext:
 669                 self._downloader.to_screen(
 670                     '[ffmpeg] Subtitle file for %s is already in the requested'
 671                     'format' % new_ext)
 672                 continue
 673             new_file = subtitles_filename(filename, lang, new_ext)
 674             self.run_ffmpeg(
 675                 subtitles_filename(filename, lang, ext),
 676                 new_file, ['-f', new_format])
 677
 678             with io.open(new_file, 'rt', encoding='utf-8') as f:
 679                 subs[lang] = {
 680                     'ext': ext,
 681                     'data': f.read(),
 682                 }
 683
 684         return True, info