Raphaël G. Git Repositories - youtubedl/blob - 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     dfxp2srt,
  24 )
  25
  26
  27 class FFmpegPostProcessorError(PostProcessingError):
  28     pass
  29
  30
  31 class FFmpegPostProcessor(PostProcessor):
  32     def __init__(self, downloader=None):
  33         PostProcessor.__init__(self, downloader)
  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  43             warning = 'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.'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         self.try_utime(out_path, oldest_mtime, oldest_mtime)
 150
 151     def run_ffmpeg(self, path, out_path, opts):
 152         self.run_ffmpeg_multiple_files([path], out_path, opts)
 153
 154     def _ffmpeg_filename_argument(self, fn):
 155         # ffmpeg broke --, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details
 156         if fn.startswith('-'):
 157             return './' + fn
 158         return fn
 159
 160
 161 class FFmpegExtractAudioPP(FFmpegPostProcessor):
 162     def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
 163         FFmpegPostProcessor.__init__(self, downloader)
 164         if preferredcodec is None:
 165             preferredcodec = 'best'
 166         self._preferredcodec = preferredcodec
 167         self._preferredquality = preferredquality
 168         self._nopostoverwrites = nopostoverwrites
 169
 170     def get_audio_codec(self, path):
 171
 172         if not self.probe_available:
 173             raise PostProcessingError('ffprobe or avprobe not found. Please install one.')
 174         try:
 175             cmd = [
 176                 encodeFilename(self.probe_executable, True),
 177                 encodeArgument('-show_streams'),
 178                 encodeFilename(self._ffmpeg_filename_argument(path), True)]
 179             if self._downloader.params.get('verbose', False):
 180                 self._downloader.to_screen('[debug] %s command line: %s' % (self.basename, shell_quote(cmd)))
 181             handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)
 182             output = handle.communicate()[0]
 183             if handle.wait() != 0:
 184                 return None
 185         except (IOError, OSError):
 186             return None
 187         audio_codec = None
 188         for line in output.decode('ascii', 'ignore').split('\n'):
 189             if line.startswith('codec_name='):
 190                 audio_codec = line.split('=')[1].strip()
 191             elif line.strip() == 'codec_type=audio' and audio_codec is not None:
 192                 return audio_codec
 193         return None
 194
 195     def run_ffmpeg(self, path, out_path, codec, more_opts):
 196         if codec is None:
 197             acodec_opts = []
 198         else:
 199             acodec_opts = ['-acodec', codec]
 200         opts = ['-vn'] + acodec_opts + more_opts
 201         try:
 202             FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
 203         except FFmpegPostProcessorError as err:
 204             raise AudioConversionError(err.msg)
 205
 206     def run(self, information):
 207         path = information['filepath']
 208
 209         filecodec = self.get_audio_codec(path)
 210         if filecodec is None:
 211             raise PostProcessingError('WARNING: unable to obtain file audio codec with ffprobe')
 212
 213         more_opts = []
 214         if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
 215             if filecodec == 'aac' and self._preferredcodec in ['m4a', 'best']:
 216                 # Lossless, but in another container
 217                 acodec = 'copy'
 218                 extension = 'm4a'
 219                 more_opts = ['-bsf:a', 'aac_adtstoasc']
 220             elif filecodec in ['aac', 'mp3', 'vorbis', 'opus']:
 221                 # Lossless if possible
 222                 acodec = 'copy'
 223                 extension = filecodec
 224                 if filecodec == 'aac':
 225                     more_opts = ['-f', 'adts']
 226                 if filecodec == 'vorbis':
 227                     extension = 'ogg'
 228             else:
 229                 # MP3 otherwise.
 230                 acodec = 'libmp3lame'
 231                 extension = 'mp3'
 232                 more_opts = []
 233                 if self._preferredquality is not None:
 234                     if int(self._preferredquality) < 10:
 235                         more_opts += ['-q:a', self._preferredquality]
 236                     else:
 237                         more_opts += ['-b:a', self._preferredquality + 'k']
 238         else:
 239             # We convert the audio (lossy)
 240             acodec = {'mp3': 'libmp3lame', 'aac': 'aac', 'm4a': 'aac', 'opus': 'opus', 'vorbis': 'libvorbis', 'wav': None}[self._preferredcodec]
 241             extension = self._preferredcodec
 242             more_opts = []
 243             if self._preferredquality is not None:
 244                 # The opus codec doesn't support the -aq option
 245                 if int(self._preferredquality) < 10 and extension != 'opus':
 246                     more_opts += ['-q:a', self._preferredquality]
 247                 else:
 248                     more_opts += ['-b:a', self._preferredquality + 'k']
 249             if self._preferredcodec == 'aac':
 250                 more_opts += ['-f', 'adts']
 251             if self._preferredcodec == 'm4a':
 252                 more_opts += ['-bsf:a', 'aac_adtstoasc']
 253             if self._preferredcodec == 'vorbis':
 254                 extension = 'ogg'
 255             if self._preferredcodec == 'wav':
 256                 extension = 'wav'
 257                 more_opts += ['-f', 'wav']
 258
 259         prefix, sep, ext = path.rpartition('.')  # not os.path.splitext, since the latter does not work on unicode in all setups
 260         new_path = prefix + sep + extension
 261
 262         # If we download foo.mp3 and convert it to... foo.mp3, then don't delete foo.mp3, silly.
 263         if (new_path == path or
 264                 (self._nopostoverwrites and os.path.exists(encodeFilename(new_path)))):
 265             self._downloader.to_screen('[youtube] Post-process file %s exists, skipping' % new_path)
 266             return [], information
 267
 268         try:
 269             self._downloader.to_screen('[' + self.basename + '] Destination: ' + new_path)
 270             self.run_ffmpeg(path, new_path, acodec, more_opts)
 271         except AudioConversionError as e:
 272             raise PostProcessingError(
 273                 'audio conversion failed: ' + e.msg)
 274         except Exception:
 275             raise PostProcessingError('error running ' + self.basename)
 276
 277         # Try to update the date time for extracted audio file.
 278         if information.get('filetime') is not None:
 279             self.try_utime(
 280                 new_path, time.time(), information['filetime'],
 281                 errnote='Cannot update utime of audio file')
 282
 283         information['filepath'] = new_path
 284         information['ext'] = extension
 285
 286         return [path], information
 287
 288
 289 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 290     def __init__(self, downloader=None, preferedformat=None):
 291         super(FFmpegVideoConvertorPP, self).__init__(downloader)
 292         self._preferedformat = preferedformat
 293
 294     def run(self, information):
 295         path = information['filepath']
 296         prefix, sep, ext = path.rpartition('.')
 297         outpath = prefix + sep + self._preferedformat
 298         if information['ext'] == self._preferedformat:
 299             self._downloader.to_screen('[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
 300             return [], information
 301         self._downloader.to_screen('[' + 'ffmpeg' + '] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
 302         self.run_ffmpeg(path, outpath, [])
 303         information['filepath'] = outpath
 304         information['format'] = self._preferedformat
 305         information['ext'] = self._preferedformat
 306         return [path], information
 307
 308
 309 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 310     # See http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt
 311     _lang_map = {
 312         'aa': 'aar',
 313         'ab': 'abk',
 314         'ae': 'ave',
 315         'af': 'afr',
 316         'ak': 'aka',
 317         'am': 'amh',
 318         'an': 'arg',
 319         'ar': 'ara',
 320         'as': 'asm',
 321         'av': 'ava',
 322         'ay': 'aym',
 323         'az': 'aze',
 324         'ba': 'bak',
 325         'be': 'bel',
 326         'bg': 'bul',
 327         'bh': 'bih',
 328         'bi': 'bis',
 329         'bm': 'bam',
 330         'bn': 'ben',
 331         'bo': 'bod',
 332         'br': 'bre',
 333         'bs': 'bos',
 334         'ca': 'cat',
 335         'ce': 'che',
 336         'ch': 'cha',
 337         'co': 'cos',
 338         'cr': 'cre',
 339         'cs': 'ces',
 340         'cu': 'chu',
 341         'cv': 'chv',
 342         'cy': 'cym',
 343         'da': 'dan',
 344         'de': 'deu',
 345         'dv': 'div',
 346         'dz': 'dzo',
 347         'ee': 'ewe',
 348         'el': 'ell',
 349         'en': 'eng',
 350         'eo': 'epo',
 351         'es': 'spa',
 352         'et': 'est',
 353         'eu': 'eus',
 354         'fa': 'fas',
 355         'ff': 'ful',
 356         'fi': 'fin',
 357         'fj': 'fij',
 358         'fo': 'fao',
 359         'fr': 'fra',
 360         'fy': 'fry',
 361         'ga': 'gle',
 362         'gd': 'gla',
 363         'gl': 'glg',
 364         'gn': 'grn',
 365         'gu': 'guj',
 366         'gv': 'glv',
 367         'ha': 'hau',
 368         'he': 'heb',
 369         'hi': 'hin',
 370         'ho': 'hmo',
 371         'hr': 'hrv',
 372         'ht': 'hat',
 373         'hu': 'hun',
 374         'hy': 'hye',
 375         'hz': 'her',
 376         'ia': 'ina',
 377         'id': 'ind',
 378         'ie': 'ile',
 379         'ig': 'ibo',
 380         'ii': 'iii',
 381         'ik': 'ipk',
 382         'io': 'ido',
 383         'is': 'isl',
 384         'it': 'ita',
 385         'iu': 'iku',
 386         'ja': 'jpn',
 387         'jv': 'jav',
 388         'ka': 'kat',
 389         'kg': 'kon',
 390         'ki': 'kik',
 391         'kj': 'kua',
 392         'kk': 'kaz',
 393         'kl': 'kal',
 394         'km': 'khm',
 395         'kn': 'kan',
 396         'ko': 'kor',
 397         'kr': 'kau',
 398         'ks': 'kas',
 399         'ku': 'kur',
 400         'kv': 'kom',
 401         'kw': 'cor',
 402         'ky': 'kir',
 403         'la': 'lat',
 404         'lb': 'ltz',
 405         'lg': 'lug',
 406         'li': 'lim',
 407         'ln': 'lin',
 408         'lo': 'lao',
 409         'lt': 'lit',
 410         'lu': 'lub',
 411         'lv': 'lav',
 412         'mg': 'mlg',
 413         'mh': 'mah',
 414         'mi': 'mri',
 415         'mk': 'mkd',
 416         'ml': 'mal',
 417         'mn': 'mon',
 418         'mr': 'mar',
 419         'ms': 'msa',
 420         'mt': 'mlt',
 421         'my': 'mya',
 422         'na': 'nau',
 423         'nb': 'nob',
 424         'nd': 'nde',
 425         'ne': 'nep',
 426         'ng': 'ndo',
 427         'nl': 'nld',
 428         'nn': 'nno',
 429         'no': 'nor',
 430         'nr': 'nbl',
 431         'nv': 'nav',
 432         'ny': 'nya',
 433         'oc': 'oci',
 434         'oj': 'oji',
 435         'om': 'orm',
 436         'or': 'ori',
 437         'os': 'oss',
 438         'pa': 'pan',
 439         'pi': 'pli',
 440         'pl': 'pol',
 441         'ps': 'pus',
 442         'pt': 'por',
 443         'qu': 'que',
 444         'rm': 'roh',
 445         'rn': 'run',
 446         'ro': 'ron',
 447         'ru': 'rus',
 448         'rw': 'kin',
 449         'sa': 'san',
 450         'sc': 'srd',
 451         'sd': 'snd',
 452         'se': 'sme',
 453         'sg': 'sag',
 454         'si': 'sin',
 455         'sk': 'slk',
 456         'sl': 'slv',
 457         'sm': 'smo',
 458         'sn': 'sna',
 459         'so': 'som',
 460         'sq': 'sqi',
 461         'sr': 'srp',
 462         'ss': 'ssw',
 463         'st': 'sot',
 464         'su': 'sun',
 465         'sv': 'swe',
 466         'sw': 'swa',
 467         'ta': 'tam',
 468         'te': 'tel',
 469         'tg': 'tgk',
 470         'th': 'tha',
 471         'ti': 'tir',
 472         'tk': 'tuk',
 473         'tl': 'tgl',
 474         'tn': 'tsn',
 475         'to': 'ton',
 476         'tr': 'tur',
 477         'ts': 'tso',
 478         'tt': 'tat',
 479         'tw': 'twi',
 480         'ty': 'tah',
 481         'ug': 'uig',
 482         'uk': 'ukr',
 483         'ur': 'urd',
 484         'uz': 'uzb',
 485         've': 'ven',
 486         'vi': 'vie',
 487         'vo': 'vol',
 488         'wa': 'wln',
 489         'wo': 'wol',
 490         'xh': 'xho',
 491         'yi': 'yid',
 492         'yo': 'yor',
 493         'za': 'zha',
 494         'zh': 'zho',
 495         'zu': 'zul',
 496     }
 497
 498     @classmethod
 499     def _conver_lang_code(cls, code):
 500         """Convert language code from ISO 639-1 to ISO 639-2/T"""
 501         return cls._lang_map.get(code[:2])
 502
 503     def run(self, information):
 504         if information['ext'] not in ['mp4', 'mkv']:
 505             self._downloader.to_screen('[ffmpeg] Subtitles can only be embedded in mp4 or mkv files')
 506             return [], information
 507         subtitles = information.get('requested_subtitles')
 508         if not subtitles:
 509             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to embed')
 510             return [], information
 511
 512         sub_langs = list(subtitles.keys())
 513         filename = information['filepath']
 514         sub_filenames = [subtitles_filename(filename, lang, sub_info['ext']) for lang, sub_info in subtitles.items()]
 515         input_files = [filename] + sub_filenames
 516
 517         opts = [
 518             '-map', '0',
 519             '-c', 'copy',
 520             # Don't copy the existing subtitles, we may be running the
 521             # postprocessor a second time
 522             '-map', '-0:s',
 523         ]
 524         if information['ext'] == 'mp4':
 525             opts += ['-c:s', 'mov_text']
 526         for (i, lang) in enumerate(sub_langs):
 527             opts.extend(['-map', '%d:0' % (i + 1)])
 528             lang_code = self._conver_lang_code(lang)
 529             if lang_code is not None:
 530                 opts.extend(['-metadata:s:s:%d' % i, 'language=%s' % lang_code])
 531
 532         temp_filename = prepend_extension(filename, 'temp')
 533         self._downloader.to_screen('[ffmpeg] Embedding subtitles in \'%s\'' % filename)
 534         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
 535         os.remove(encodeFilename(filename))
 536         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 537
 538         return sub_filenames, information
 539
 540
 541 class FFmpegMetadataPP(FFmpegPostProcessor):
 542     def run(self, info):
 543         metadata = {}
 544         if info.get('title') is not None:
 545             metadata['title'] = info['title']
 546         if info.get('upload_date') is not None:
 547             metadata['date'] = info['upload_date']
 548         if info.get('artist') is not None:
 549             metadata['artist'] = info['artist']
 550         elif info.get('uploader') is not None:
 551             metadata['artist'] = info['uploader']
 552         elif info.get('uploader_id') is not None:
 553             metadata['artist'] = info['uploader_id']
 554         if info.get('description') is not None:
 555             metadata['description'] = info['description']
 556             metadata['comment'] = info['description']
 557         if info.get('webpage_url') is not None:
 558             metadata['purl'] = info['webpage_url']
 559         if info.get('album') is not None:
 560             metadata['album'] = info['album']
 561
 562         if not metadata:
 563             self._downloader.to_screen('[ffmpeg] There isn\'t any metadata to add')
 564             return [], info
 565
 566         filename = info['filepath']
 567         temp_filename = prepend_extension(filename, 'temp')
 568
 569         if info['ext'] == 'm4a':
 570             options = ['-vn', '-acodec', 'copy']
 571         else:
 572             options = ['-c', 'copy']
 573
 574         for (name, value) in metadata.items():
 575             options.extend(['-metadata', '%s=%s' % (name, value)])
 576
 577         self._downloader.to_screen('[ffmpeg] Adding metadata to \'%s\'' % filename)
 578         self.run_ffmpeg(filename, temp_filename, options)
 579         os.remove(encodeFilename(filename))
 580         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 581         return [], info
 582
 583
 584 class FFmpegMergerPP(FFmpegPostProcessor):
 585     def run(self, info):
 586         filename = info['filepath']
 587         temp_filename = prepend_extension(filename, 'temp')
 588         args = ['-c', 'copy', '-map', '0:v:0', '-map', '1:a:0']
 589         self._downloader.to_screen('[ffmpeg] Merging formats into "%s"' % filename)
 590         self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
 591         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 592         return info['__files_to_merge'], info
 593
 594     def can_merge(self):
 595         # TODO: figure out merge-capable ffmpeg version
 596         if self.basename != 'avconv':
 597             return True
 598
 599         required_version = '10-0'
 600         if is_outdated_version(
 601                 self._versions[self.basename], required_version):
 602             warning = ('Your copy of %s is outdated and unable to properly mux separate video and audio files, '
 603                        'youtube-dl will download single file media. '
 604                        'Update %s to version %s or newer to fix this.') % (
 605                            self.basename, self.basename, required_version)
 606             if self._downloader:
 607                 self._downloader.report_warning(warning)
 608             return False
 609         return True
 610
 611
 612 class FFmpegFixupStretchedPP(FFmpegPostProcessor):
 613     def run(self, info):
 614         stretched_ratio = info.get('stretched_ratio')
 615         if stretched_ratio is None or stretched_ratio == 1:
 616             return [], info
 617
 618         filename = info['filepath']
 619         temp_filename = prepend_extension(filename, 'temp')
 620
 621         options = ['-c', 'copy', '-aspect', '%f' % stretched_ratio]
 622         self._downloader.to_screen('[ffmpeg] Fixing aspect ratio in "%s"' % filename)
 623         self.run_ffmpeg(filename, temp_filename, options)
 624
 625         os.remove(encodeFilename(filename))
 626         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 627
 628         return [], info
 629
 630
 631 class FFmpegFixupM4aPP(FFmpegPostProcessor):
 632     def run(self, info):
 633         if info.get('container') != 'm4a_dash':
 634             return [], info
 635
 636         filename = info['filepath']
 637         temp_filename = prepend_extension(filename, 'temp')
 638
 639         options = ['-c', 'copy', '-f', 'mp4']
 640         self._downloader.to_screen('[ffmpeg] Correcting container in "%s"' % filename)
 641         self.run_ffmpeg(filename, temp_filename, options)
 642
 643         os.remove(encodeFilename(filename))
 644         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 645
 646         return [], info
 647
 648
 649 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 650     def __init__(self, downloader=None, format=None):
 651         super(FFmpegSubtitlesConvertorPP, self).__init__(downloader)
 652         self.format = format
 653
 654     def run(self, info):
 655         subs = info.get('requested_subtitles')
 656         filename = info['filepath']
 657         new_ext = self.format
 658         new_format = new_ext
 659         if new_format == 'vtt':
 660             new_format = 'webvtt'
 661         if subs is None:
 662             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to convert')
 663             return [], info
 664         self._downloader.to_screen('[ffmpeg] Converting subtitles')
 665         for lang, sub in subs.items():
 666             ext = sub['ext']
 667             if ext == new_ext:
 668                 self._downloader.to_screen(
 669                     '[ffmpeg] Subtitle file for %s is already in the requested'
 670                     'format' % new_ext)
 671                 continue
 672             new_file = subtitles_filename(filename, lang, new_ext)
 673
 674             if ext == 'dfxp' or ext == 'ttml':
 675                 self._downloader.report_warning(
 676                     'You have requested to convert dfxp (TTML) subtitles into another format, '
 677                     'which results in style information loss')
 678
 679                 dfxp_file = subtitles_filename(filename, lang, ext)
 680                 srt_file = subtitles_filename(filename, lang, 'srt')
 681
 682                 with io.open(dfxp_file, 'rt', encoding='utf-8') as f:
 683                     srt_data = dfxp2srt(f.read())
 684
 685                 with io.open(srt_file, 'wt', encoding='utf-8') as f:
 686                     f.write(srt_data)
 687
 688                 ext = 'srt'
 689                 subs[lang] = {
 690                     'ext': 'srt',
 691                     'data': srt_data
 692                 }
 693
 694                 if new_ext == 'srt':
 695                     continue
 696
 697             self.run_ffmpeg(
 698                 subtitles_filename(filename, lang, ext),
 699                 new_file, ['-f', new_format])
 700
 701             with io.open(new_file, 'rt', encoding='utf-8') as f:
 702                 subs[lang] = {
 703                     'ext': ext,
 704                     'data': f.read(),
 705                 }
 706
 707         return [], info