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 import re
   8
   9
  10 from .common import AudioConversionError, PostProcessor
  11
  12 from ..compat import (
  13     compat_subprocess_get_DEVNULL,
  14 )
  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     subtitles_filename,
  24     dfxp2srt,
  25     ISO639Utils,
  26     replace_extension,
  27 )
  28
  29
  30 EXT_TO_OUT_FORMATS = {
  31     'aac': 'adts',
  32     'flac': 'flac',
  33     'm4a': 'ipod',
  34     'mka': 'matroska',
  35     'mkv': 'matroska',
  36     'mpg': 'mpeg',
  37     'ogv': 'ogg',
  38     'ts': 'mpegts',
  39     'wma': 'asf',
  40     'wmv': 'asf',
  41 }
  42 ACODECS = {
  43     'mp3': 'libmp3lame',
  44     'aac': 'aac',
  45     'flac': 'flac',
  46     'm4a': 'aac',
  47     'opus': 'libopus',
  48     'vorbis': 'libvorbis',
  49     'wav': None,
  50 }
  51
  52
  53 class FFmpegPostProcessorError(PostProcessingError):
  54     pass
  55
  56
  57 class FFmpegPostProcessor(PostProcessor):
  58     def __init__(self, downloader=None):
  59         PostProcessor.__init__(self, downloader)
  60         self._determine_executables()
  61
  62     def check_version(self):
  63         if not self.available:
  64             raise FFmpegPostProcessorError('ffmpeg or avconv not found. Please install one.')
  65
  66         required_version = '10-0' if self.basename == 'avconv' else '1.0'
  67         if is_outdated_version(
  68                 self._versions[self.basename], required_version):
  69             warning = 'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.' % (
  70                 self.basename, self.basename, required_version)
  71             if self._downloader:
  72                 self._downloader.report_warning(warning)
  73
  74     @staticmethod
  75     def get_versions(downloader=None):
  76         return FFmpegPostProcessor(downloader)._versions
  77
  78     def _determine_executables(self):
  79         programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe']
  80         prefer_ffmpeg = True
  81
  82         def get_ffmpeg_version(path):
  83             ver = get_exe_version(path, args=['-version'])
  84             if ver:
  85                 regexs = [
  86                     r'(?:\d+:)?([0-9.]+)-[0-9]+ubuntu[0-9.]+$',  # Ubuntu, see [1]
  87                     r'n([0-9.]+)$',  # Arch Linux
  88                     # 1. http://www.ducea.com/2006/06/17/ubuntu-package-version-naming-explanation/
  89                 ]
  90                 for regex in regexs:
  91                     mobj = re.match(regex, ver)
  92                     if mobj:
  93                         ver = mobj.group(1)
  94             return ver
  95
  96         self.basename = None
  97         self.probe_basename = None
  98
  99         self._paths = None
 100         self._versions = None
 101         if self._downloader:
 102             prefer_ffmpeg = self._downloader.params.get('prefer_ffmpeg', True)
 103             location = self._downloader.params.get('ffmpeg_location')
 104             if location is not None:
 105                 if not os.path.exists(location):
 106                     self._downloader.report_warning(
 107                         'ffmpeg-location %s does not exist! '
 108                         'Continuing without avconv/ffmpeg.' % (location))
 109                     self._versions = {}
 110                     return
 111                 elif not os.path.isdir(location):
 112                     basename = os.path.splitext(os.path.basename(location))[0]
 113                     if basename not in programs:
 114                         self._downloader.report_warning(
 115                             'Cannot identify executable %s, its basename should be one of %s. '
 116                             'Continuing without avconv/ffmpeg.' %
 117                             (location, ', '.join(programs)))
 118                         self._versions = {}
 119                         return None
 120                     location = os.path.dirname(os.path.abspath(location))
 121                     if basename in ('ffmpeg', 'ffprobe'):
 122                         prefer_ffmpeg = True
 123
 124                 self._paths = dict(
 125                     (p, os.path.join(location, p)) for p in programs)
 126                 self._versions = dict(
 127                     (p, get_ffmpeg_version(self._paths[p])) for p in programs)
 128         if self._versions is None:
 129             self._versions = dict(
 130                 (p, get_ffmpeg_version(p)) for p in programs)
 131             self._paths = dict((p, p) for p in programs)
 132
 133         if prefer_ffmpeg is False:
 134             prefs = ('avconv', 'ffmpeg')
 135         else:
 136             prefs = ('ffmpeg', 'avconv')
 137         for p in prefs:
 138             if self._versions[p]:
 139                 self.basename = p
 140                 break
 141
 142         if prefer_ffmpeg is False:
 143             prefs = ('avprobe', 'ffprobe')
 144         else:
 145             prefs = ('ffprobe', 'avprobe')
 146         for p in prefs:
 147             if self._versions[p]:
 148                 self.probe_basename = p
 149                 break
 150
 151     @property
 152     def available(self):
 153         return self.basename is not None
 154
 155     @property
 156     def executable(self):
 157         return self._paths[self.basename]
 158
 159     @property
 160     def probe_available(self):
 161         return self.probe_basename is not None
 162
 163     @property
 164     def probe_executable(self):
 165         return self._paths[self.probe_basename]
 166
 167     def get_audio_codec(self, path):
 168         if not self.probe_available:
 169             raise PostProcessingError('ffprobe or avprobe not found. Please install one.')
 170         try:
 171             cmd = [
 172                 encodeFilename(self.probe_executable, True),
 173                 encodeArgument('-show_streams'),
 174                 encodeFilename(self._ffmpeg_filename_argument(path), True)]
 175             if self._downloader.params.get('verbose', False):
 176                 self._downloader.to_screen('[debug] %s command line: %s' % (self.basename, shell_quote(cmd)))
 177             handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)
 178             output = handle.communicate()[0]
 179             if handle.wait() != 0:
 180                 return None
 181         except (IOError, OSError):
 182             return None
 183         audio_codec = None
 184         for line in output.decode('ascii', 'ignore').split('\n'):
 185             if line.startswith('codec_name='):
 186                 audio_codec = line.split('=')[1].strip()
 187             elif line.strip() == 'codec_type=audio' and audio_codec is not None:
 188                 return audio_codec
 189         return None
 190
 191     def run_ffmpeg_multiple_files(self, input_paths, out_path, opts):
 192         self.check_version()
 193
 194         oldest_mtime = min(
 195             os.stat(encodeFilename(path)).st_mtime for path in input_paths)
 196
 197         opts += self._configuration_args()
 198
 199         files_cmd = []
 200         for path in input_paths:
 201             files_cmd.extend([
 202                 encodeArgument('-i'),
 203                 encodeFilename(self._ffmpeg_filename_argument(path), True)
 204             ])
 205         cmd = ([encodeFilename(self.executable, True), encodeArgument('-y')] +
 206                files_cmd +
 207                [encodeArgument(o) for o in opts] +
 208                [encodeFilename(self._ffmpeg_filename_argument(out_path), True)])
 209
 210         if self._downloader.params.get('verbose', False):
 211             self._downloader.to_screen('[debug] ffmpeg command line: %s' % shell_quote(cmd))
 212         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 213         stdout, stderr = p.communicate()
 214         if p.returncode != 0:
 215             stderr = stderr.decode('utf-8', 'replace')
 216             msg = stderr.strip().split('\n')[-1]
 217             raise FFmpegPostProcessorError(msg)
 218         self.try_utime(out_path, oldest_mtime, oldest_mtime)
 219
 220     def run_ffmpeg(self, path, out_path, opts):
 221         self.run_ffmpeg_multiple_files([path], out_path, opts)
 222
 223     def _ffmpeg_filename_argument(self, fn):
 224         # Always use 'file:' because the filename may contain ':' (ffmpeg
 225         # interprets that as a protocol) or can start with '-' (-- is broken in
 226         # ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
 227         # Also leave '-' intact in order not to break streaming to stdout.
 228         return 'file:' + fn if fn != '-' else fn
 229
 230
 231 class FFmpegExtractAudioPP(FFmpegPostProcessor):
 232     def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
 233         FFmpegPostProcessor.__init__(self, downloader)
 234         if preferredcodec is None:
 235             preferredcodec = 'best'
 236         self._preferredcodec = preferredcodec
 237         self._preferredquality = preferredquality
 238         self._nopostoverwrites = nopostoverwrites
 239
 240     def run_ffmpeg(self, path, out_path, codec, more_opts):
 241         if codec is None:
 242             acodec_opts = []
 243         else:
 244             acodec_opts = ['-acodec', codec]
 245         opts = ['-vn'] + acodec_opts + more_opts
 246         try:
 247             FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
 248         except FFmpegPostProcessorError as err:
 249             raise AudioConversionError(err.msg)
 250
 251     def run(self, information):
 252         path = information['filepath']
 253
 254         filecodec = self.get_audio_codec(path)
 255         if filecodec is None:
 256             raise PostProcessingError('WARNING: unable to obtain file audio codec with ffprobe')
 257
 258         more_opts = []
 259         if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
 260             if filecodec == 'aac' and self._preferredcodec in ['m4a', 'best']:
 261                 # Lossless, but in another container
 262                 acodec = 'copy'
 263                 extension = 'm4a'
 264                 more_opts = ['-bsf:a', 'aac_adtstoasc']
 265             elif filecodec in ['aac', 'flac', 'mp3', 'vorbis', 'opus']:
 266                 # Lossless if possible
 267                 acodec = 'copy'
 268                 extension = filecodec
 269                 if filecodec == 'aac':
 270                     more_opts = ['-f', 'adts']
 271                 if filecodec == 'vorbis':
 272                     extension = 'ogg'
 273             else:
 274                 # MP3 otherwise.
 275                 acodec = 'libmp3lame'
 276                 extension = 'mp3'
 277                 more_opts = []
 278                 if self._preferredquality is not None:
 279                     if int(self._preferredquality) < 10:
 280                         more_opts += ['-q:a', self._preferredquality]
 281                     else:
 282                         more_opts += ['-b:a', self._preferredquality + 'k']
 283         else:
 284             # We convert the audio (lossy if codec is lossy)
 285             acodec = ACODECS[self._preferredcodec]
 286             extension = self._preferredcodec
 287             more_opts = []
 288             if self._preferredquality is not None:
 289                 # The opus codec doesn't support the -aq option
 290                 if int(self._preferredquality) < 10 and extension != 'opus':
 291                     more_opts += ['-q:a', self._preferredquality]
 292                 else:
 293                     more_opts += ['-b:a', self._preferredquality + 'k']
 294             if self._preferredcodec == 'aac':
 295                 more_opts += ['-f', 'adts']
 296             if self._preferredcodec == 'm4a':
 297                 more_opts += ['-bsf:a', 'aac_adtstoasc']
 298             if self._preferredcodec == 'vorbis':
 299                 extension = 'ogg'
 300             if self._preferredcodec == 'wav':
 301                 extension = 'wav'
 302                 more_opts += ['-f', 'wav']
 303
 304         prefix, sep, ext = path.rpartition('.')  # not os.path.splitext, since the latter does not work on unicode in all setups
 305         new_path = prefix + sep + extension
 306
 307         information['filepath'] = new_path
 308         information['ext'] = extension
 309
 310         # If we download foo.mp3 and convert it to... foo.mp3, then don't delete foo.mp3, silly.
 311         if (new_path == path or
 312                 (self._nopostoverwrites and os.path.exists(encodeFilename(new_path)))):
 313             self._downloader.to_screen('[ffmpeg] Post-process file %s exists, skipping' % new_path)
 314             return [], information
 315
 316         try:
 317             self._downloader.to_screen('[ffmpeg] Destination: ' + new_path)
 318             self.run_ffmpeg(path, new_path, acodec, more_opts)
 319         except AudioConversionError as e:
 320             raise PostProcessingError(
 321                 'audio conversion failed: ' + e.msg)
 322         except Exception:
 323             raise PostProcessingError('error running ' + self.basename)
 324
 325         # Try to update the date time for extracted audio file.
 326         if information.get('filetime') is not None:
 327             self.try_utime(
 328                 new_path, time.time(), information['filetime'],
 329                 errnote='Cannot update utime of audio file')
 330
 331         return [path], information
 332
 333
 334 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 335     def __init__(self, downloader=None, preferedformat=None):
 336         super(FFmpegVideoConvertorPP, self).__init__(downloader)
 337         self._preferedformat = preferedformat
 338
 339     def run(self, information):
 340         path = information['filepath']
 341         if information['ext'] == self._preferedformat:
 342             self._downloader.to_screen('[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
 343             return [], information
 344         options = []
 345         if self._preferedformat == 'avi':
 346             options.extend(['-c:v', 'libxvid', '-vtag', 'XVID'])
 347         prefix, sep, ext = path.rpartition('.')
 348         outpath = prefix + sep + self._preferedformat
 349         self._downloader.to_screen('[' + 'ffmpeg' + '] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
 350         self.run_ffmpeg(path, outpath, options)
 351         information['filepath'] = outpath
 352         information['format'] = self._preferedformat
 353         information['ext'] = self._preferedformat
 354         return [path], information
 355
 356
 357 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 358     def run(self, information):
 359         if information['ext'] not in ('mp4', 'webm', 'mkv'):
 360             self._downloader.to_screen('[ffmpeg] Subtitles can only be embedded in mp4, webm or mkv files')
 361             return [], information
 362         subtitles = information.get('requested_subtitles')
 363         if not subtitles:
 364             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to embed')
 365             return [], information
 366
 367         filename = information['filepath']
 368
 369         ext = information['ext']
 370         sub_langs = []
 371         sub_filenames = []
 372         webm_vtt_warn = False
 373
 374         for lang, sub_info in subtitles.items():
 375             sub_ext = sub_info['ext']
 376             if ext != 'webm' or ext == 'webm' and sub_ext == 'vtt':
 377                 sub_langs.append(lang)
 378                 sub_filenames.append(subtitles_filename(filename, lang, sub_ext))
 379             else:
 380                 if not webm_vtt_warn and ext == 'webm' and sub_ext != 'vtt':
 381                     webm_vtt_warn = True
 382                     self._downloader.to_screen('[ffmpeg] Only WebVTT subtitles can be embedded in webm files')
 383
 384         if not sub_langs:
 385             return [], information
 386
 387         input_files = [filename] + sub_filenames
 388
 389         opts = [
 390             '-map', '0',
 391             '-c', 'copy',
 392             # Don't copy the existing subtitles, we may be running the
 393             # postprocessor a second time
 394             '-map', '-0:s',
 395         ]
 396         if information['ext'] == 'mp4':
 397             opts += ['-c:s', 'mov_text']
 398         for (i, lang) in enumerate(sub_langs):
 399             opts.extend(['-map', '%d:0' % (i + 1)])
 400             lang_code = ISO639Utils.short2long(lang) or lang
 401             opts.extend(['-metadata:s:s:%d' % i, 'language=%s' % lang_code])
 402
 403         temp_filename = prepend_extension(filename, 'temp')
 404         self._downloader.to_screen('[ffmpeg] Embedding subtitles in \'%s\'' % filename)
 405         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
 406         os.remove(encodeFilename(filename))
 407         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 408
 409         return sub_filenames, information
 410
 411
 412 class FFmpegMetadataPP(FFmpegPostProcessor):
 413     def run(self, info):
 414         metadata = {}
 415
 416         def add(meta_list, info_list=None):
 417             if not info_list:
 418                 info_list = meta_list
 419             if not isinstance(meta_list, (list, tuple)):
 420                 meta_list = (meta_list,)
 421             if not isinstance(info_list, (list, tuple)):
 422                 info_list = (info_list,)
 423             for info_f in info_list:
 424                 if info.get(info_f) is not None:
 425                     for meta_f in meta_list:
 426                         metadata[meta_f] = info[info_f]
 427                     break
 428
 429         add('title', ('track', 'title'))
 430         add('date', 'upload_date')
 431         add(('description', 'comment'), 'description')
 432         add('purl', 'webpage_url')
 433         add('track', 'track_number')
 434         add('artist', ('artist', 'creator', 'uploader', 'uploader_id'))
 435         add('genre')
 436         add('album')
 437         add('album_artist')
 438         add('disc', 'disc_number')
 439
 440         if not metadata:
 441             self._downloader.to_screen('[ffmpeg] There isn\'t any metadata to add')
 442             return [], info
 443
 444         filename = info['filepath']
 445         temp_filename = prepend_extension(filename, 'temp')
 446         in_filenames = [filename]
 447         options = []
 448
 449         if info['ext'] == 'm4a':
 450             options.extend(['-vn', '-acodec', 'copy'])
 451         else:
 452             options.extend(['-c', 'copy'])
 453
 454         for (name, value) in metadata.items():
 455             options.extend(['-metadata', '%s=%s' % (name, value)])
 456
 457         chapters = info.get('chapters', [])
 458         if chapters:
 459             metadata_filename = replace_extension(filename, 'meta')
 460             with io.open(metadata_filename, 'wt', encoding='utf-8') as f:
 461                 def ffmpeg_escape(text):
 462                     return re.sub(r'(=|;|#|\\|\n)', r'\\\1', text)
 463
 464                 metadata_file_content = ';FFMETADATA1\n'
 465                 for chapter in chapters:
 466                     metadata_file_content += '[CHAPTER]\nTIMEBASE=1/1000\n'
 467                     metadata_file_content += 'START=%d\n' % (chapter['start_time'] * 1000)
 468                     metadata_file_content += 'END=%d\n' % (chapter['end_time'] * 1000)
 469                     chapter_title = chapter.get('title')
 470                     if chapter_title:
 471                         metadata_file_content += 'title=%s\n' % ffmpeg_escape(chapter_title)
 472                 f.write(metadata_file_content)
 473                 in_filenames.append(metadata_filename)
 474                 options.extend(['-map_metadata', '1'])
 475
 476         self._downloader.to_screen('[ffmpeg] Adding metadata to \'%s\'' % filename)
 477         self.run_ffmpeg_multiple_files(in_filenames, temp_filename, options)
 478         if chapters:
 479             os.remove(metadata_filename)
 480         os.remove(encodeFilename(filename))
 481         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 482         return [], info
 483
 484
 485 class FFmpegMergerPP(FFmpegPostProcessor):
 486     def run(self, info):
 487         filename = info['filepath']
 488         temp_filename = prepend_extension(filename, 'temp')
 489         args = ['-c', 'copy', '-map', '0:v:0', '-map', '1:a:0']
 490         self._downloader.to_screen('[ffmpeg] Merging formats into "%s"' % filename)
 491         self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
 492         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 493         return info['__files_to_merge'], info
 494
 495     def can_merge(self):
 496         # TODO: figure out merge-capable ffmpeg version
 497         if self.basename != 'avconv':
 498             return True
 499
 500         required_version = '10-0'
 501         if is_outdated_version(
 502                 self._versions[self.basename], required_version):
 503             warning = ('Your copy of %s is outdated and unable to properly mux separate video and audio files, '
 504                        'youtube-dl will download single file media. '
 505                        'Update %s to version %s or newer to fix this.') % (
 506                            self.basename, self.basename, required_version)
 507             if self._downloader:
 508                 self._downloader.report_warning(warning)
 509             return False
 510         return True
 511
 512
 513 class FFmpegFixupStretchedPP(FFmpegPostProcessor):
 514     def run(self, info):
 515         stretched_ratio = info.get('stretched_ratio')
 516         if stretched_ratio is None or stretched_ratio == 1:
 517             return [], info
 518
 519         filename = info['filepath']
 520         temp_filename = prepend_extension(filename, 'temp')
 521
 522         options = ['-c', 'copy', '-aspect', '%f' % stretched_ratio]
 523         self._downloader.to_screen('[ffmpeg] Fixing aspect ratio in "%s"' % filename)
 524         self.run_ffmpeg(filename, temp_filename, options)
 525
 526         os.remove(encodeFilename(filename))
 527         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 528
 529         return [], info
 530
 531
 532 class FFmpegFixupM4aPP(FFmpegPostProcessor):
 533     def run(self, info):
 534         if info.get('container') != 'm4a_dash':
 535             return [], info
 536
 537         filename = info['filepath']
 538         temp_filename = prepend_extension(filename, 'temp')
 539
 540         options = ['-c', 'copy', '-f', 'mp4']
 541         self._downloader.to_screen('[ffmpeg] Correcting container in "%s"' % filename)
 542         self.run_ffmpeg(filename, temp_filename, options)
 543
 544         os.remove(encodeFilename(filename))
 545         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 546
 547         return [], info
 548
 549
 550 class FFmpegFixupM3u8PP(FFmpegPostProcessor):
 551     def run(self, info):
 552         filename = info['filepath']
 553         if self.get_audio_codec(filename) == 'aac':
 554             temp_filename = prepend_extension(filename, 'temp')
 555
 556             options = ['-c', 'copy', '-f', 'mp4', '-bsf:a', 'aac_adtstoasc']
 557             self._downloader.to_screen('[ffmpeg] Fixing malformed AAC bitstream in "%s"' % filename)
 558             self.run_ffmpeg(filename, temp_filename, options)
 559
 560             os.remove(encodeFilename(filename))
 561             os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 562         return [], info
 563
 564
 565 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 566     def __init__(self, downloader=None, format=None):
 567         super(FFmpegSubtitlesConvertorPP, self).__init__(downloader)
 568         self.format = format
 569
 570     def run(self, info):
 571         subs = info.get('requested_subtitles')
 572         filename = info['filepath']
 573         new_ext = self.format
 574         new_format = new_ext
 575         if new_format == 'vtt':
 576             new_format = 'webvtt'
 577         if subs is None:
 578             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to convert')
 579             return [], info
 580         self._downloader.to_screen('[ffmpeg] Converting subtitles')
 581         sub_filenames = []
 582         for lang, sub in subs.items():
 583             ext = sub['ext']
 584             if ext == new_ext:
 585                 self._downloader.to_screen(
 586                     '[ffmpeg] Subtitle file for %s is already in the requested format' % new_ext)
 587                 continue
 588             old_file = subtitles_filename(filename, lang, ext)
 589             sub_filenames.append(old_file)
 590             new_file = subtitles_filename(filename, lang, new_ext)
 591
 592             if ext in ('dfxp', 'ttml', 'tt'):
 593                 self._downloader.report_warning(
 594                     'You have requested to convert dfxp (TTML) subtitles into another format, '
 595                     'which results in style information loss')
 596
 597                 dfxp_file = old_file
 598                 srt_file = subtitles_filename(filename, lang, 'srt')
 599
 600                 with open(dfxp_file, 'rb') as f:
 601                     srt_data = dfxp2srt(f.read())
 602
 603                 with io.open(srt_file, 'wt', encoding='utf-8') as f:
 604                     f.write(srt_data)
 605                 old_file = srt_file
 606
 607                 subs[lang] = {
 608                     'ext': 'srt',
 609                     'data': srt_data
 610                 }
 611
 612                 if new_ext == 'srt':
 613                     continue
 614                 else:
 615                     sub_filenames.append(srt_file)
 616
 617             self.run_ffmpeg(old_file, new_file, ['-f', new_format])
 618
 619             with io.open(new_file, 'rt', encoding='utf-8') as f:
 620                 subs[lang] = {
 621                     'ext': new_ext,
 622                     'data': f.read(),
 623                 }
 624
 625         return sub_filenames, info