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, extra_cmd_args=None):
  33         PostProcessor.__init__(self, downloader, extra_cmd_args)
  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  43             warning = 'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.'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, extra_cmd_args=None):
 291         super(FFmpegVideoConvertorPP, self).__init__(downloader, extra_cmd_args)
 292         self._preferedformat = preferedformat
 293
 294     def run(self, information):
 295         path = information['filepath']
 296         prefix, sep, ext = path.rpartition('.')
 297         ext = self._preferedformat
 298         options = self._extra_cmd_args
 299         if self._preferedformat == 'xvid':
 300             ext = 'avi'
 301             options.extend(['-c:v', 'libxvid', '-vtag', 'XVID'])
 302         outpath = prefix + sep + ext
 303         if information['ext'] == self._preferedformat:
 304             self._downloader.to_screen('[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
 305             return [], information
 306         self._downloader.to_screen('[' + 'ffmpeg' + '] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
 307         self.run_ffmpeg(path, outpath, options)
 308         information['filepath'] = outpath
 309         information['format'] = self._preferedformat
 310         information['ext'] = ext
 311         return [path], information
 312
 313
 314 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 315     # See http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt
 316     _lang_map = {
 317         'aa': 'aar',
 318         'ab': 'abk',
 319         'ae': 'ave',
 320         'af': 'afr',
 321         'ak': 'aka',
 322         'am': 'amh',
 323         'an': 'arg',
 324         'ar': 'ara',
 325         'as': 'asm',
 326         'av': 'ava',
 327         'ay': 'aym',
 328         'az': 'aze',
 329         'ba': 'bak',
 330         'be': 'bel',
 331         'bg': 'bul',
 332         'bh': 'bih',
 333         'bi': 'bis',
 334         'bm': 'bam',
 335         'bn': 'ben',
 336         'bo': 'bod',
 337         'br': 'bre',
 338         'bs': 'bos',
 339         'ca': 'cat',
 340         'ce': 'che',
 341         'ch': 'cha',
 342         'co': 'cos',
 343         'cr': 'cre',
 344         'cs': 'ces',
 345         'cu': 'chu',
 346         'cv': 'chv',
 347         'cy': 'cym',
 348         'da': 'dan',
 349         'de': 'deu',
 350         'dv': 'div',
 351         'dz': 'dzo',
 352         'ee': 'ewe',
 353         'el': 'ell',
 354         'en': 'eng',
 355         'eo': 'epo',
 356         'es': 'spa',
 357         'et': 'est',
 358         'eu': 'eus',
 359         'fa': 'fas',
 360         'ff': 'ful',
 361         'fi': 'fin',
 362         'fj': 'fij',
 363         'fo': 'fao',
 364         'fr': 'fra',
 365         'fy': 'fry',
 366         'ga': 'gle',
 367         'gd': 'gla',
 368         'gl': 'glg',
 369         'gn': 'grn',
 370         'gu': 'guj',
 371         'gv': 'glv',
 372         'ha': 'hau',
 373         'he': 'heb',
 374         'hi': 'hin',
 375         'ho': 'hmo',
 376         'hr': 'hrv',
 377         'ht': 'hat',
 378         'hu': 'hun',
 379         'hy': 'hye',
 380         'hz': 'her',
 381         'ia': 'ina',
 382         'id': 'ind',
 383         'ie': 'ile',
 384         'ig': 'ibo',
 385         'ii': 'iii',
 386         'ik': 'ipk',
 387         'io': 'ido',
 388         'is': 'isl',
 389         'it': 'ita',
 390         'iu': 'iku',
 391         'ja': 'jpn',
 392         'jv': 'jav',
 393         'ka': 'kat',
 394         'kg': 'kon',
 395         'ki': 'kik',
 396         'kj': 'kua',
 397         'kk': 'kaz',
 398         'kl': 'kal',
 399         'km': 'khm',
 400         'kn': 'kan',
 401         'ko': 'kor',
 402         'kr': 'kau',
 403         'ks': 'kas',
 404         'ku': 'kur',
 405         'kv': 'kom',
 406         'kw': 'cor',
 407         'ky': 'kir',
 408         'la': 'lat',
 409         'lb': 'ltz',
 410         'lg': 'lug',
 411         'li': 'lim',
 412         'ln': 'lin',
 413         'lo': 'lao',
 414         'lt': 'lit',
 415         'lu': 'lub',
 416         'lv': 'lav',
 417         'mg': 'mlg',
 418         'mh': 'mah',
 419         'mi': 'mri',
 420         'mk': 'mkd',
 421         'ml': 'mal',
 422         'mn': 'mon',
 423         'mr': 'mar',
 424         'ms': 'msa',
 425         'mt': 'mlt',
 426         'my': 'mya',
 427         'na': 'nau',
 428         'nb': 'nob',
 429         'nd': 'nde',
 430         'ne': 'nep',
 431         'ng': 'ndo',
 432         'nl': 'nld',
 433         'nn': 'nno',
 434         'no': 'nor',
 435         'nr': 'nbl',
 436         'nv': 'nav',
 437         'ny': 'nya',
 438         'oc': 'oci',
 439         'oj': 'oji',
 440         'om': 'orm',
 441         'or': 'ori',
 442         'os': 'oss',
 443         'pa': 'pan',
 444         'pi': 'pli',
 445         'pl': 'pol',
 446         'ps': 'pus',
 447         'pt': 'por',
 448         'qu': 'que',
 449         'rm': 'roh',
 450         'rn': 'run',
 451         'ro': 'ron',
 452         'ru': 'rus',
 453         'rw': 'kin',
 454         'sa': 'san',
 455         'sc': 'srd',
 456         'sd': 'snd',
 457         'se': 'sme',
 458         'sg': 'sag',
 459         'si': 'sin',
 460         'sk': 'slk',
 461         'sl': 'slv',
 462         'sm': 'smo',
 463         'sn': 'sna',
 464         'so': 'som',
 465         'sq': 'sqi',
 466         'sr': 'srp',
 467         'ss': 'ssw',
 468         'st': 'sot',
 469         'su': 'sun',
 470         'sv': 'swe',
 471         'sw': 'swa',
 472         'ta': 'tam',
 473         'te': 'tel',
 474         'tg': 'tgk',
 475         'th': 'tha',
 476         'ti': 'tir',
 477         'tk': 'tuk',
 478         'tl': 'tgl',
 479         'tn': 'tsn',
 480         'to': 'ton',
 481         'tr': 'tur',
 482         'ts': 'tso',
 483         'tt': 'tat',
 484         'tw': 'twi',
 485         'ty': 'tah',
 486         'ug': 'uig',
 487         'uk': 'ukr',
 488         'ur': 'urd',
 489         'uz': 'uzb',
 490         've': 'ven',
 491         'vi': 'vie',
 492         'vo': 'vol',
 493         'wa': 'wln',
 494         'wo': 'wol',
 495         'xh': 'xho',
 496         'yi': 'yid',
 497         'yo': 'yor',
 498         'za': 'zha',
 499         'zh': 'zho',
 500         'zu': 'zul',
 501     }
 502
 503     @classmethod
 504     def _conver_lang_code(cls, code):
 505         """Convert language code from ISO 639-1 to ISO 639-2/T"""
 506         return cls._lang_map.get(code[:2])
 507
 508     def run(self, information):
 509         if information['ext'] not in ['mp4', 'mkv']:
 510             self._downloader.to_screen('[ffmpeg] Subtitles can only be embedded in mp4 or mkv files')
 511             return [], information
 512         subtitles = information.get('requested_subtitles')
 513         if not subtitles:
 514             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to embed')
 515             return [], information
 516
 517         sub_langs = list(subtitles.keys())
 518         filename = information['filepath']
 519         sub_filenames = [subtitles_filename(filename, lang, sub_info['ext']) for lang, sub_info in subtitles.items()]
 520         input_files = [filename] + sub_filenames
 521
 522         opts = [
 523             '-map', '0',
 524             '-c', 'copy',
 525             # Don't copy the existing subtitles, we may be running the
 526             # postprocessor a second time
 527             '-map', '-0:s',
 528         ]
 529         if information['ext'] == 'mp4':
 530             opts += ['-c:s', 'mov_text']
 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 sub_filenames, 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 [], 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 [], info
 587
 588
 589 class FFmpegMergerPP(FFmpegPostProcessor):
 590     def run(self, info):
 591         filename = info['filepath']
 592         temp_filename = prepend_extension(filename, 'temp')
 593         args = ['-c', 'copy', '-map', '0:v:0', '-map', '1:a:0']
 594         self._downloader.to_screen('[ffmpeg] Merging formats into "%s"' % filename)
 595         self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
 596         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 597         return info['__files_to_merge'], info
 598
 599     def can_merge(self):
 600         # TODO: figure out merge-capable ffmpeg version
 601         if self.basename != 'avconv':
 602             return True
 603
 604         required_version = '10-0'
 605         if is_outdated_version(
 606                 self._versions[self.basename], required_version):
 607             warning = ('Your copy of %s is outdated and unable to properly mux separate video and audio files, '
 608                        'youtube-dl will download single file media. '
 609                        'Update %s to version %s or newer to fix this.') % (
 610                            self.basename, self.basename, required_version)
 611             if self._downloader:
 612                 self._downloader.report_warning(warning)
 613             return False
 614         return True
 615
 616
 617 class FFmpegFixupStretchedPP(FFmpegPostProcessor):
 618     def run(self, info):
 619         stretched_ratio = info.get('stretched_ratio')
 620         if stretched_ratio is None or stretched_ratio == 1:
 621             return [], info
 622
 623         filename = info['filepath']
 624         temp_filename = prepend_extension(filename, 'temp')
 625
 626         options = ['-c', 'copy', '-aspect', '%f' % stretched_ratio]
 627         self._downloader.to_screen('[ffmpeg] Fixing aspect ratio in "%s"' % filename)
 628         self.run_ffmpeg(filename, temp_filename, options)
 629
 630         os.remove(encodeFilename(filename))
 631         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 632
 633         return [], info
 634
 635
 636 class FFmpegFixupM4aPP(FFmpegPostProcessor):
 637     def run(self, info):
 638         if info.get('container') != 'm4a_dash':
 639             return [], info
 640
 641         filename = info['filepath']
 642         temp_filename = prepend_extension(filename, 'temp')
 643
 644         options = ['-c', 'copy', '-f', 'mp4']
 645         self._downloader.to_screen('[ffmpeg] Correcting container in "%s"' % filename)
 646         self.run_ffmpeg(filename, temp_filename, options)
 647
 648         os.remove(encodeFilename(filename))
 649         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 650
 651         return [], info
 652
 653
 654 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 655     def __init__(self, downloader=None, format=None):
 656         super(FFmpegSubtitlesConvertorPP, self).__init__(downloader)
 657         self.format = format
 658
 659     def run(self, info):
 660         subs = info.get('requested_subtitles')
 661         filename = info['filepath']
 662         new_ext = self.format
 663         new_format = new_ext
 664         if new_format == 'vtt':
 665             new_format = 'webvtt'
 666         if subs is None:
 667             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to convert')
 668             return [], info
 669         self._downloader.to_screen('[ffmpeg] Converting subtitles')
 670         for lang, sub in subs.items():
 671             ext = sub['ext']
 672             if ext == new_ext:
 673                 self._downloader.to_screen(
 674                     '[ffmpeg] Subtitle file for %s is already in the requested'
 675                     'format' % new_ext)
 676                 continue
 677             new_file = subtitles_filename(filename, lang, new_ext)
 678
 679             if ext == 'dfxp' or ext == 'ttml':
 680                 self._downloader.report_warning(
 681                     'You have requested to convert dfxp (TTML) subtitles into another format, '
 682                     'which results in style information loss')
 683
 684                 dfxp_file = subtitles_filename(filename, lang, ext)
 685                 srt_file = subtitles_filename(filename, lang, 'srt')
 686
 687                 with io.open(dfxp_file, 'rt', encoding='utf-8') as f:
 688                     srt_data = dfxp2srt(f.read())
 689
 690                 with io.open(srt_file, 'wt', encoding='utf-8') as f:
 691                     f.write(srt_data)
 692
 693                 ext = 'srt'
 694                 subs[lang] = {
 695                     'ext': 'srt',
 696                     'data': srt_data
 697                 }
 698
 699                 if new_ext == 'srt':
 700                     continue
 701
 702             self.run_ffmpeg(
 703                 subtitles_filename(filename, lang, ext),
 704                 new_file, ['-f', new_format])
 705
 706             with io.open(new_file, 'rt', encoding='utf-8') as f:
 707                 subs[lang] = {
 708                     'ext': ext,
 709                     'data': f.read(),
 710                 }
 711
 712         return [], info