youtube_dlc/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  69             warning = 'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.'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         if self._downloader.params.get('verbose', False):
 225             self._downloader.to_screen('[debug] ffprobe command line: %s' % shell_quote(cmd))
 226         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 227         stdout, stderr = p.communicate()
 228         return json.loads(stdout.decode('utf-8', 'replace'))
 229
 230     def get_stream_number(self, path, keys, value):
 231         streams = self.get_metadata_object(path)['streams']
 232         num = next(
 233             (i for i, stream in enumerate(streams) if traverse_dict(stream, keys, casesense=False) == value),
 234             None)
 235         return num, len(streams)
 236
 237     def run_ffmpeg_multiple_files(self, input_paths, out_path, opts):
 238         self.check_version()
 239
 240         oldest_mtime = min(
 241             os.stat(encodeFilename(path)).st_mtime for path in input_paths)
 242
 243         opts += self._configuration_args(exe=self.basename)
 244
 245         files_cmd = []
 246         for path in input_paths:
 247             files_cmd.extend([
 248                 encodeArgument('-i'),
 249                 encodeFilename(self._ffmpeg_filename_argument(path), True)
 250             ])
 251         cmd = [encodeFilename(self.executable, True), encodeArgument('-y')]
 252         # avconv does not have repeat option
 253         if self.basename == 'ffmpeg':
 254             cmd += [encodeArgument('-loglevel'), encodeArgument('repeat+info')]
 255         cmd += (files_cmd
 256                 + [encodeArgument(o) for o in opts]
 257                 + [encodeFilename(self._ffmpeg_filename_argument(out_path), True)])
 258
 259         self.write_debug('ffmpeg command line: %s' % shell_quote(cmd))
 260         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
 261         stdout, stderr = process_communicate_or_kill(p)
 262         if p.returncode != 0:
 263             stderr = stderr.decode('utf-8', 'replace').strip()
 264             if self._downloader.params.get('verbose', False):
 265                 self.report_error(stderr)
 266             raise FFmpegPostProcessorError(stderr.split('\n')[-1])
 267         self.try_utime(out_path, oldest_mtime, oldest_mtime)
 268         return stderr.decode('utf-8', 'replace')
 269
 270     def run_ffmpeg(self, path, out_path, opts):
 271         return self.run_ffmpeg_multiple_files([path], out_path, opts)
 272
 273     def _ffmpeg_filename_argument(self, fn):
 274         # Always use 'file:' because the filename may contain ':' (ffmpeg
 275         # interprets that as a protocol) or can start with '-' (-- is broken in
 276         # ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
 277         # Also leave '-' intact in order not to break streaming to stdout.
 278         if fn.startswith(('http://', 'https://')):
 279             return fn
 280         return 'file:' + fn if fn != '-' else fn
 281
 282
 283 class FFmpegExtractAudioPP(FFmpegPostProcessor):
 284     def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
 285         FFmpegPostProcessor.__init__(self, downloader)
 286         if preferredcodec is None:
 287             preferredcodec = 'best'
 288         self._preferredcodec = preferredcodec
 289         self._preferredquality = preferredquality
 290         self._nopostoverwrites = nopostoverwrites
 291
 292     def run_ffmpeg(self, path, out_path, codec, more_opts):
 293         if codec is None:
 294             acodec_opts = []
 295         else:
 296             acodec_opts = ['-acodec', codec]
 297         opts = ['-vn'] + acodec_opts + more_opts
 298         try:
 299             FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
 300         except FFmpegPostProcessorError as err:
 301             raise AudioConversionError(err.msg)
 302
 303     def run(self, information):
 304         path = information['filepath']
 305
 306         filecodec = self.get_audio_codec(path)
 307         if filecodec is None:
 308             raise PostProcessingError('WARNING: unable to obtain file audio codec with ffprobe')
 309
 310         more_opts = []
 311         if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
 312             if filecodec == 'aac' and self._preferredcodec in ['m4a', 'best']:
 313                 # Lossless, but in another container
 314                 acodec = 'copy'
 315                 extension = 'm4a'
 316                 more_opts = ['-bsf:a', 'aac_adtstoasc']
 317             elif filecodec in ['aac', 'flac', 'mp3', 'vorbis', 'opus']:
 318                 # Lossless if possible
 319                 acodec = 'copy'
 320                 extension = filecodec
 321                 if filecodec == 'aac':
 322                     more_opts = ['-f', 'adts']
 323                 if filecodec == 'vorbis':
 324                     extension = 'ogg'
 325             else:
 326                 # MP3 otherwise.
 327                 acodec = 'libmp3lame'
 328                 extension = 'mp3'
 329                 more_opts = []
 330                 if self._preferredquality is not None:
 331                     if int(self._preferredquality) < 10:
 332                         more_opts += ['-q:a', self._preferredquality]
 333                     else:
 334                         more_opts += ['-b:a', self._preferredquality + 'k']
 335         else:
 336             # We convert the audio (lossy if codec is lossy)
 337             acodec = ACODECS[self._preferredcodec]
 338             extension = self._preferredcodec
 339             more_opts = []
 340             if self._preferredquality is not None:
 341                 # The opus codec doesn't support the -aq option
 342                 if int(self._preferredquality) < 10 and extension != 'opus':
 343                     more_opts += ['-q:a', self._preferredquality]
 344                 else:
 345                     more_opts += ['-b:a', self._preferredquality + 'k']
 346             if self._preferredcodec == 'aac':
 347                 more_opts += ['-f', 'adts']
 348             if self._preferredcodec == 'm4a':
 349                 more_opts += ['-bsf:a', 'aac_adtstoasc']
 350             if self._preferredcodec == 'vorbis':
 351                 extension = 'ogg'
 352             if self._preferredcodec == 'wav':
 353                 extension = 'wav'
 354                 more_opts += ['-f', 'wav']
 355
 356         prefix, sep, ext = path.rpartition('.')  # not os.path.splitext, since the latter does not work on unicode in all setups
 357         new_path = prefix + sep + extension
 358
 359         information['filepath'] = new_path
 360         information['ext'] = extension
 361
 362         # If we download foo.mp3 and convert it to... foo.mp3, then don't delete foo.mp3, silly.
 363         if (new_path == path
 364                 or (self._nopostoverwrites and os.path.exists(encodeFilename(new_path)))):
 365             self.to_screen('Post-process file %s exists, skipping' % new_path)
 366             return [], information
 367
 368         try:
 369             self.to_screen('Destination: ' + new_path)
 370             self.run_ffmpeg(path, new_path, acodec, more_opts)
 371         except AudioConversionError as e:
 372             raise PostProcessingError(
 373                 'audio conversion failed: ' + e.msg)
 374         except Exception:
 375             raise PostProcessingError('error running ' + self.basename)
 376
 377         # Try to update the date time for extracted audio file.
 378         if information.get('filetime') is not None:
 379             self.try_utime(
 380                 new_path, time.time(), information['filetime'],
 381                 errnote='Cannot update utime of audio file')
 382
 383         return [path], information
 384
 385
 386 class FFmpegVideoRemuxerPP(FFmpegPostProcessor):
 387     def __init__(self, downloader=None, preferedformat=None):
 388         super(FFmpegVideoRemuxerPP, self).__init__(downloader)
 389         self._preferedformats = preferedformat.lower().split('/')
 390
 391     def run(self, information):
 392         path = information['filepath']
 393         sourceext, targetext = information['ext'].lower(), None
 394         for pair in self._preferedformats:
 395             kv = pair.split('>')
 396             if len(kv) == 1 or kv[0].strip() == sourceext:
 397                 targetext = kv[-1].strip()
 398                 break
 399
 400         _skip_msg = (
 401             'could not find a mapping for %s' if not targetext
 402             else 'already is in target format %s' if sourceext == targetext
 403             else None)
 404         if _skip_msg:
 405             self.to_screen('Not remuxing media file %s; %s' % (path, _skip_msg % sourceext))
 406             return [], information
 407
 408         options = ['-c', 'copy', '-map', '0', '-dn']
 409         if targetext in ['mp4', 'm4a', 'mov']:
 410             options.extend(['-movflags', '+faststart'])
 411         prefix, sep, oldext = path.rpartition('.')
 412         outpath = prefix + sep + targetext
 413         self.to_screen('Remuxing video from %s to %s; Destination: %s' % (sourceext, targetext, outpath))
 414         self.run_ffmpeg(path, outpath, options)
 415         information['filepath'] = outpath
 416         information['format'] = targetext
 417         information['ext'] = targetext
 418         return [path], information
 419
 420
 421 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 422     def __init__(self, downloader=None, preferedformat=None):
 423         super(FFmpegVideoConvertorPP, self).__init__(downloader)
 424         self._preferedformat = preferedformat
 425
 426     def run(self, information):
 427         path = information['filepath']
 428         if information['ext'] == self._preferedformat:
 429             self.to_screen('Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
 430             return [], information
 431         options = []
 432         if self._preferedformat == 'avi':
 433             options.extend(['-c:v', 'libxvid', '-vtag', 'XVID'])
 434         prefix, sep, ext = path.rpartition('.')
 435         outpath = prefix + sep + self._preferedformat
 436         self.to_screen('Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
 437         self.run_ffmpeg(path, outpath, options)
 438         information['filepath'] = outpath
 439         information['format'] = self._preferedformat
 440         information['ext'] = self._preferedformat
 441         return [path], information
 442
 443
 444 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
 445     def __init__(self, downloader=None, already_have_subtitle=False):
 446         super(FFmpegEmbedSubtitlePP, self).__init__(downloader)
 447         self._already_have_subtitle = already_have_subtitle
 448
 449     def run(self, information):
 450         if information['ext'] not in ('mp4', 'webm', 'mkv'):
 451             self.to_screen('Subtitles can only be embedded in mp4, webm or mkv files')
 452             return [], information
 453         subtitles = information.get('requested_subtitles')
 454         if not subtitles:
 455             self.to_screen('There aren\'t any subtitles to embed')
 456             return [], information
 457
 458         filename = information['filepath']
 459
 460         ext = information['ext']
 461         sub_langs = []
 462         sub_filenames = []
 463         webm_vtt_warn = False
 464         mp4_ass_warn = False
 465
 466         for lang, sub_info in subtitles.items():
 467             sub_ext = sub_info['ext']
 468             if sub_ext == 'json':
 469                 self.report_warning('JSON subtitles cannot be embedded')
 470             elif ext != 'webm' or ext == 'webm' and sub_ext == 'vtt':
 471                 sub_langs.append(lang)
 472                 sub_filenames.append(subtitles_filename(filename, lang, sub_ext, ext))
 473             else:
 474                 if not webm_vtt_warn and ext == 'webm' and sub_ext != 'vtt':
 475                     webm_vtt_warn = True
 476                     self.report_warning('Only WebVTT subtitles can be embedded in webm files')
 477             if not mp4_ass_warn and ext == 'mp4' and sub_ext == 'ass':
 478                 mp4_ass_warn = True
 479                 self.report_warning('ASS subtitles cannot be properly embedded in mp4 files; expect issues')
 480
 481         if not sub_langs:
 482             return [], information
 483
 484         input_files = [filename] + sub_filenames
 485
 486         opts = [
 487             '-c', 'copy', '-map', '0', '-dn',
 488             # Don't copy the existing subtitles, we may be running the
 489             # postprocessor a second time
 490             '-map', '-0:s',
 491             # Don't copy Apple TV chapters track, bin_data (see #19042, #19024,
 492             # https://trac.ffmpeg.org/ticket/6016)
 493             '-map', '-0:d',
 494         ]
 495         if information['ext'] == 'mp4':
 496             opts += ['-c:s', 'mov_text']
 497         for (i, lang) in enumerate(sub_langs):
 498             opts.extend(['-map', '%d:0' % (i + 1)])
 499             lang_code = ISO639Utils.short2long(lang) or lang
 500             opts.extend(['-metadata:s:s:%d' % i, 'language=%s' % lang_code])
 501
 502         temp_filename = prepend_extension(filename, 'temp')
 503         self.to_screen('Embedding subtitles in "%s"' % filename)
 504         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
 505         os.remove(encodeFilename(filename))
 506         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 507
 508         files_to_delete = [] if self._already_have_subtitle else sub_filenames
 509         return files_to_delete, information
 510
 511
 512 class FFmpegMetadataPP(FFmpegPostProcessor):
 513     def run(self, info):
 514         metadata = {}
 515
 516         def add(meta_list, info_list=None):
 517             if not info_list:
 518                 info_list = meta_list
 519             if not isinstance(meta_list, (list, tuple)):
 520                 meta_list = (meta_list,)
 521             if not isinstance(info_list, (list, tuple)):
 522                 info_list = (info_list,)
 523             for info_f in info_list:
 524                 if info.get(info_f) is not None:
 525                     for meta_f in meta_list:
 526                         metadata[meta_f] = info[info_f]
 527                     break
 528
 529         # See [1-4] for some info on media metadata/metadata supported
 530         # by ffmpeg.
 531         # 1. https://kdenlive.org/en/project/adding-meta-data-to-mp4-video/
 532         # 2. https://wiki.multimedia.cx/index.php/FFmpeg_Metadata
 533         # 3. https://kodi.wiki/view/Video_file_tagging
 534
 535         add('title', ('track', 'title'))
 536         add('date', 'upload_date')
 537         add(('description', 'comment'), 'description')
 538         add('purl', 'webpage_url')
 539         add('track', 'track_number')
 540         add('artist', ('artist', 'creator', 'uploader', 'uploader_id'))
 541         add('genre')
 542         add('album')
 543         add('album_artist')
 544         add('disc', 'disc_number')
 545         add('show', 'series')
 546         add('season_number')
 547         add('episode_id', ('episode', 'episode_id'))
 548         add('episode_sort', 'episode_number')
 549
 550         if not metadata:
 551             self.to_screen('There isn\'t any metadata to add')
 552             return [], info
 553
 554         filename = info['filepath']
 555         temp_filename = prepend_extension(filename, 'temp')
 556         in_filenames = [filename]
 557         options = ['-map', '0', '-dn']
 558
 559         if info['ext'] == 'm4a':
 560             options.extend(['-vn', '-acodec', 'copy'])
 561         else:
 562             options.extend(['-c', 'copy'])
 563
 564         for (name, value) in metadata.items():
 565             options.extend(['-metadata', '%s=%s' % (name, value)])
 566
 567         chapters = info.get('chapters', [])
 568         if chapters:
 569             metadata_filename = replace_extension(filename, 'meta')
 570             with io.open(metadata_filename, 'wt', encoding='utf-8') as f:
 571                 def ffmpeg_escape(text):
 572                     return re.sub(r'(=|;|#|\\|\n)', r'\\\1', text)
 573
 574                 metadata_file_content = ';FFMETADATA1\n'
 575                 for chapter in chapters:
 576                     metadata_file_content += '[CHAPTER]\nTIMEBASE=1/1000\n'
 577                     metadata_file_content += 'START=%d\n' % (chapter['start_time'] * 1000)
 578                     metadata_file_content += 'END=%d\n' % (chapter['end_time'] * 1000)
 579                     chapter_title = chapter.get('title')
 580                     if chapter_title:
 581                         metadata_file_content += 'title=%s\n' % ffmpeg_escape(chapter_title)
 582                 f.write(metadata_file_content)
 583                 in_filenames.append(metadata_filename)
 584                 options.extend(['-map_metadata', '1'])
 585
 586         if '__infojson_filename' in info and info['ext'] in ('mkv', 'mka'):
 587             old_stream, new_stream = self.get_stream_number(
 588                 filename, ('tags', 'mimetype'), 'application/json')
 589             if old_stream is not None:
 590                 options.extend(['-map', '-0:%d' % old_stream])
 591                 new_stream -= 1
 592
 593             options.extend([
 594                 '-attach', info['__infojson_filename'],
 595                 '-metadata:s:%d' % new_stream, 'mimetype=application/json'
 596             ])
 597
 598         self.to_screen('Adding metadata to \'%s\'' % filename)
 599         self.run_ffmpeg_multiple_files(in_filenames, temp_filename, options)
 600         if chapters:
 601             os.remove(metadata_filename)
 602         os.remove(encodeFilename(filename))
 603         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 604         return [], info
 605
 606
 607 class FFmpegMergerPP(FFmpegPostProcessor):
 608     def run(self, info):
 609         filename = info['filepath']
 610         temp_filename = prepend_extension(filename, 'temp')
 611         args = ['-c', 'copy']
 612         for (i, fmt) in enumerate(info['requested_formats']):
 613             if fmt.get('acodec') != 'none':
 614                 args.extend(['-map', '%u:a:0' % (i)])
 615             if fmt.get('vcodec') != 'none':
 616                 args.extend(['-map', '%u:v:0' % (i)])
 617         self.to_screen('Merging formats into "%s"' % filename)
 618         self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
 619         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 620         return info['__files_to_merge'], info
 621
 622     def can_merge(self):
 623         # TODO: figure out merge-capable ffmpeg version
 624         if self.basename != 'avconv':
 625             return True
 626
 627         required_version = '10-0'
 628         if is_outdated_version(
 629                 self._versions[self.basename], required_version):
 630             warning = ('Your copy of %s is outdated and unable to properly mux separate video and audio files, '
 631                        'youtube-dlc will download single file media. '
 632                        'Update %s to version %s or newer to fix this.') % (
 633                            self.basename, self.basename, required_version)
 634             self.report_warning(warning)
 635             return False
 636         return True
 637
 638
 639 class FFmpegFixupStretchedPP(FFmpegPostProcessor):
 640     def run(self, info):
 641         stretched_ratio = info.get('stretched_ratio')
 642         if stretched_ratio is None or stretched_ratio == 1:
 643             return [], info
 644
 645         filename = info['filepath']
 646         temp_filename = prepend_extension(filename, 'temp')
 647
 648         options = ['-c', 'copy', '-map', '0', '-dn', '-aspect', '%f' % stretched_ratio]
 649         self.to_screen('Fixing aspect ratio in "%s"' % filename)
 650         self.run_ffmpeg(filename, temp_filename, options)
 651
 652         os.remove(encodeFilename(filename))
 653         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 654
 655         return [], info
 656
 657
 658 class FFmpegFixupM4aPP(FFmpegPostProcessor):
 659     def run(self, info):
 660         if info.get('container') != 'm4a_dash':
 661             return [], info
 662
 663         filename = info['filepath']
 664         temp_filename = prepend_extension(filename, 'temp')
 665
 666         options = ['-c', 'copy', '-map', '0', '-dn', '-f', 'mp4']
 667         self.to_screen('Correcting container in "%s"' % filename)
 668         self.run_ffmpeg(filename, temp_filename, options)
 669
 670         os.remove(encodeFilename(filename))
 671         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 672
 673         return [], info
 674
 675
 676 class FFmpegFixupM3u8PP(FFmpegPostProcessor):
 677     def run(self, info):
 678         filename = info['filepath']
 679         if self.get_audio_codec(filename) == 'aac':
 680             temp_filename = prepend_extension(filename, 'temp')
 681
 682             options = ['-c', 'copy', '-map', '0', '-dn', '-f', 'mp4', '-bsf:a', 'aac_adtstoasc']
 683             self.to_screen('Fixing malformed AAC bitstream 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         return [], info
 689
 690
 691 class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):
 692     def __init__(self, downloader=None, format=None):
 693         super(FFmpegSubtitlesConvertorPP, self).__init__(downloader)
 694         self.format = format
 695
 696     def run(self, info):
 697         subs = info.get('requested_subtitles')
 698         filename = info['filepath']
 699         new_ext = self.format
 700         new_format = new_ext
 701         if new_format == 'vtt':
 702             new_format = 'webvtt'
 703         if subs is None:
 704             self.to_screen('There aren\'t any subtitles to convert')
 705             return [], info
 706         self.to_screen('Converting subtitles')
 707         sub_filenames = []
 708         for lang, sub in subs.items():
 709             ext = sub['ext']
 710             if ext == new_ext:
 711                 self.to_screen('Subtitle file for %s is already in the requested format' % new_ext)
 712                 continue
 713             elif ext == 'json':
 714                 self.to_screen(
 715                     'You have requested to convert json subtitles into another format, '
 716                     'which is currently not possible')
 717                 continue
 718             old_file = subtitles_filename(filename, lang, ext, info.get('ext'))
 719             sub_filenames.append(old_file)
 720             new_file = subtitles_filename(filename, lang, new_ext, info.get('ext'))
 721
 722             if ext in ('dfxp', 'ttml', 'tt'):
 723                 self.report_warning(
 724                     'You have requested to convert dfxp (TTML) subtitles into another format, '
 725                     'which results in style information loss')
 726
 727                 dfxp_file = old_file
 728                 srt_file = subtitles_filename(filename, lang, 'srt', info.get('ext'))
 729
 730                 with open(dfxp_file, 'rb') as f:
 731                     srt_data = dfxp2srt(f.read())
 732
 733                 with io.open(srt_file, 'wt', encoding='utf-8') as f:
 734                     f.write(srt_data)
 735                 old_file = srt_file
 736
 737                 subs[lang] = {
 738                     'ext': 'srt',
 739                     'data': srt_data
 740                 }
 741
 742                 if new_ext == 'srt':
 743                     continue
 744                 else:
 745                     sub_filenames.append(srt_file)
 746
 747             self.run_ffmpeg(old_file, new_file, ['-f', new_format])
 748
 749             with io.open(new_file, 'rt', encoding='utf-8') as f:
 750                 subs[lang] = {
 751                     'ext': new_ext,
 752                     'data': f.read(),
 753                 }
 754
 755         return sub_filenames, info