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  69             warning = 'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.'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