plugins/video/transcode.py

   1 import subprocess, shutil, os, re, sys, tempfile, ConfigParser, time, lrucache, math
   2 import config
   3 from debug import debug_write, fn_attr
   4
   5 info_cache = lrucache.LRUCache(1000)
   6 videotest = os.path.join(os.path.dirname(__file__), 'videotest.mpg')
   7
   8 def ffmpeg_path():
   9     return config.get('Server', 'ffmpeg')
  10
  11 # XXX BIG HACK
  12 # subprocess is broken for me on windows so super hack
  13 def patchSubprocess():
  14     o = subprocess.Popen._make_inheritable
  15
  16     def _make_inheritable(self, handle):
  17         if not handle: return subprocess.GetCurrentProcess()
  18         return o(self, handle)
  19
  20     subprocess.Popen._make_inheritable = _make_inheritable
  21 mswindows = (sys.platform == "win32")
  22 if mswindows:
  23     patchSubprocess()
  24
  25 def output_video(inFile, outFile, tsn=''):
  26     if tivo_compatable(inFile, tsn):
  27         debug_write(__name__, fn_attr(), [inFile, ' is tivo compatible'])
  28         f = file(inFile, 'rb')
  29         shutil.copyfileobj(f, outFile)
  30         f.close()
  31     else:
  32         debug_write(__name__, fn_attr(), [inFile, ' is not tivo compatible'])
  33         transcode(inFile, outFile, tsn)
  34
  35 def transcode(inFile, outFile, tsn=''):
  36
  37     settings = {}
  38     settings['video_codec'] = select_videocodec(tsn)
  39     settings['video_br'] = select_videobr(tsn)
  40     settings['video_fps'] = select_videofps(tsn)
  41     settings['max_video_br'] = select_maxvideobr()
  42     settings['buff_size'] = select_buffsize()
  43     settings['aspect_ratio'] = ' '.join(select_aspect(inFile, tsn))
  44     settings['audio_br'] = select_audiobr(tsn)
  45     settings['audio_fr'] = select_audiofr(inFile, tsn)
  46     settings['audio_ch'] = select_audioch(tsn)
  47     settings['audio_codec'] = select_audiocodec(inFile, tsn)
  48     settings['ffmpeg_pram'] = select_ffmpegprams(tsn)
  49     settings['format'] = select_format(tsn)
  50
  51     cmd_string = config.getFFmpegTemplate(tsn) % settings
  52
  53     cmd = [ffmpeg_path(), '-i', inFile] + cmd_string.split()
  54     print 'transcoding to tivo model '+tsn[:3]+' using ffmpeg command:'
  55     print ' '.join(cmd)
  56     debug_write(__name__, fn_attr(), ['ffmpeg command is ', ' '.join(cmd)])
  57     ffmpeg = subprocess.Popen(cmd, bufsize=512*1024, stdout=subprocess.PIPE)
  58     try:
  59         shutil.copyfileobj(ffmpeg.stdout, outFile)
  60     except:
  61         kill(ffmpeg.pid)
  62
  63 def select_audiocodec(inFile, tsn = ''):
  64     # Default, compatible with all TiVo's
  65     codec = 'ac3'
  66     type, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(inFile)
  67     if config.getAudioCodec(tsn) == None:
  68         if acodec in ('ac3', 'liba52', 'mp2'):
  69             if akbps == None:
  70                 cmd_string = '-y -vcodec mpeg2video -r 29.97 -b 1000k -acodec copy -t 00:00:01 -f vob -'
  71                 if video_check(inFile, cmd_string):
  72                     typetest, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(videotest)
  73             if not akbps == None and int(akbps) <= config.getMaxAudioBR(tsn):
  74                 # compatible codec and bitrate, do not reencode audio
  75                 codec = 'copy'
  76     else:
  77         codec = config.getAudioCodec(tsn)
  78     copyts = ' -copyts'
  79     if (codec == 'copy' and config.getCopyTS(tsn).lower() == 'none' \
  80         and type == 'mpeg2video') or config.getCopyTS(tsn).lower() == 'false':
  81         copyts = ''
  82     return '-acodec '+codec+copyts
  83
  84 def select_audiofr(inFile, tsn):
  85     freq = '48000'  #default
  86     type, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(inFile)
  87     if not afreq == None and afreq in ('44100', '48000'):
  88         # compatible frequency
  89         freq = afreq
  90     if config.getAudioFR(tsn) != None:
  91         freq = config.getAudioFR(tsn)
  92     return '-ar '+freq
  93
  94 def select_audioch(tsn):
  95     if config.getAudioCH(tsn) != None:
  96         return '-ac '+config.getAudioCH(tsn)
  97     return ''
  98
  99 def select_videofps(tsn):
 100     vfps = '-r 29.97'  #default
 101     if config.isHDtivo(tsn):
 102         vfps = ' '
 103     if config.getVideoFPS(tsn) != None:
 104         vfps = '-r '+config.getVideoFPS(tsn)
 105     return vfps
 106
 107 def select_videocodec(tsn):
 108     vcodec = 'mpeg2video'  #default
 109     if config.getVideoCodec(tsn) != None:
 110         vcodec = config.getVideoCodec(tsn)
 111     return '-vcodec '+vcodec
 112
 113 def select_videobr(tsn):
 114     return '-b '+config.getVideoBR(tsn)
 115
 116 def select_audiobr(tsn):
 117     return '-ab '+config.getAudioBR(tsn)
 118
 119 def select_maxvideobr():
 120     return '-maxrate '+config.getMaxVideoBR()
 121
 122 def select_buffsize():
 123     return '-bufsize '+config.getBuffSize()
 124
 125 def select_ffmpegprams(tsn):
 126     if config.getFFmpegPrams(tsn) != None:
 127         return config.getFFmpegPrams(tsn)
 128     return ''
 129
 130 def select_format(tsn):
 131     fmt = 'vob'
 132     if config.getFormat(tsn) != None:
 133         fmt = config.getFormat(tsn)
 134     return '-f '+fmt+' -'
 135
 136 def select_aspect(inFile, tsn = ''):
 137     TIVO_WIDTH = config.getTivoWidth(tsn)
 138     TIVO_HEIGHT = config.getTivoHeight(tsn)
 139
 140     type, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(inFile)
 141
 142     debug_write(__name__, fn_attr(), ['tsn:', tsn])
 143
 144     aspect169 = config.get169Setting(tsn)
 145
 146     debug_write(__name__, fn_attr(), ['aspect169:', aspect169])
 147
 148     optres = config.getOptres(tsn)
 149
 150     debug_write(__name__, fn_attr(), ['optres:', optres])
 151
 152     if optres:
 153         optHeight = config.nearestTivoHeight(height)
 154         optWidth = config.nearestTivoWidth(width)
 155         if optHeight < TIVO_HEIGHT:
 156             TIVO_HEIGHT = optHeight
 157         if optWidth < TIVO_WIDTH:
 158             TIVO_WIDTH = optWidth
 159
 160     d = gcd(height,width)
 161     ratio = (width*100)/height
 162     rheight, rwidth = height/d, width/d
 163
 164     debug_write(__name__, fn_attr(), ['File=', inFile, ' Type=', type, ' width=', width, ' height=', height, ' fps=', fps, ' millisecs=', millisecs, ' ratio=', ratio, ' rheight=', rheight, ' rwidth=', rwidth, ' TIVO_HEIGHT=', TIVO_HEIGHT, 'TIVO_WIDTH=', TIVO_WIDTH])
 165
 166     multiplier16by9 = (16.0 * TIVO_HEIGHT) / (9.0 * TIVO_WIDTH)
 167     multiplier4by3  =  (4.0 * TIVO_HEIGHT) / (3.0 * TIVO_WIDTH)
 168
 169     if config.isHDtivo(tsn) and not optres:
 170         if config.getPixelAR(0):
 171             if par2 == None:
 172                 npar = config.getPixelAR(1)
 173             else:
 174                 npar = par2
 175             # adjust for pixel aspect ratio, if set, because TiVo expects square pixels
 176             if npar<1.0:
 177                 return ['-s', str(width) + 'x' + str(int(math.ceil(height/npar)))]
 178             elif npar>1.0:
 179                 # FFMPEG expects width to be a multiple of two
 180                 return ['-s', str(int(math.ceil(width*npar/2.0)*2)) + 'x' + str(height)]
 181         if height <= TIVO_HEIGHT:
 182             # pass all resolutions to S3, except heights greater than conf height
 183             return []
 184         # else, resize video.
 185     if (rwidth, rheight) in [(1, 1)] and par1 == '8:9':
 186         debug_write(__name__, fn_attr(), ['File + PAR is within 4:3.'])
 187         return ['-aspect', '4:3', '-s', str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT)]
 188     elif (rwidth, rheight) in [(4, 3), (10, 11), (15, 11), (59, 54), (59, 72), (59, 36), (59, 54)] or dar1 == '4:3':
 189         debug_write(__name__, fn_attr(), ['File is within 4:3 list.'])
 190         return ['-aspect', '4:3', '-s', str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT)]
 191     elif ((rwidth, rheight) in [(16, 9), (20, 11), (40, 33), (118, 81), (59, 27)] or dar1 == '16:9') and aspect169:
 192         debug_write(__name__, fn_attr(), ['File is within 16:9 list and 16:9 allowed.'])
 193         return ['-aspect', '16:9', '-s', str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT)]
 194     else:
 195         settings = []
 196         #If video is wider than 4:3 add top and bottom padding
 197         if (ratio > 133): #Might be 16:9 file, or just need padding on top and bottom
 198             if aspect169 and (ratio > 135): #If file would fall in 4:3 assume it is supposed to be 4:3
 199                 if (ratio > 177):#too short needs padding top and bottom
 200                     endHeight = int(((TIVO_WIDTH*height)/width) * multiplier16by9)
 201                     settings.append('-aspect')
 202                     settings.append('16:9')
 203                     if endHeight % 2:
 204                         endHeight -= 1
 205                     if endHeight < TIVO_HEIGHT * 0.99:
 206                         settings.append('-s')
 207                         settings.append(str(TIVO_WIDTH) + 'x' + str(endHeight))
 208
 209                         topPadding = ((TIVO_HEIGHT - endHeight)/2)
 210                         if topPadding % 2:
 211                             topPadding -= 1
 212
 213                         settings.append('-padtop')
 214                         settings.append(str(topPadding))
 215                         bottomPadding = (TIVO_HEIGHT - endHeight) - topPadding
 216                         settings.append('-padbottom')
 217                         settings.append(str(bottomPadding))
 218                     else:   #if only very small amount of padding needed, then just stretch it
 219                         settings.append('-s')
 220                         settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 221                     debug_write(__name__, fn_attr(), ['16:9 aspect allowed, file is wider than 16:9 padding top and bottom', ' '.join(settings)])
 222                 else: #too skinny needs padding on left and right.
 223                     endWidth = int((TIVO_HEIGHT*width)/(height*multiplier16by9))
 224                     settings.append('-aspect')
 225                     settings.append('16:9')
 226                     if endWidth % 2:
 227                         endWidth -= 1
 228                     if endWidth < (TIVO_WIDTH-10):
 229                         settings.append('-s')
 230                         settings.append(str(endWidth) + 'x' + str(TIVO_HEIGHT))
 231
 232                         leftPadding = ((TIVO_WIDTH - endWidth)/2)
 233                         if leftPadding % 2:
 234                             leftPadding -= 1
 235
 236                         settings.append('-padleft')
 237                         settings.append(str(leftPadding))
 238                         rightPadding = (TIVO_WIDTH - endWidth) - leftPadding
 239                         settings.append('-padright')
 240                         settings.append(str(rightPadding))
 241                     else: #if only very small amount of padding needed, then just stretch it
 242                         settings.append('-s')
 243                         settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 244                     debug_write(__name__, fn_attr(), ['16:9 aspect allowed, file is narrower than 16:9 padding left and right\n', ' '.join(settings)])
 245             else: #this is a 4:3 file or 16:9 output not allowed
 246                 settings.append('-aspect')
 247                 settings.append('4:3')
 248                 endHeight = int(((TIVO_WIDTH*height)/width) * multiplier4by3)
 249                 if endHeight % 2:
 250                     endHeight -= 1
 251                 if endHeight < TIVO_HEIGHT * 0.99:
 252                     settings.append('-s')
 253                     settings.append(str(TIVO_WIDTH) + 'x' + str(endHeight))
 254
 255                     topPadding = ((TIVO_HEIGHT - endHeight)/2)
 256                     if topPadding % 2:
 257                         topPadding -= 1
 258
 259                     settings.append('-padtop')
 260                     settings.append(str(topPadding))
 261                     bottomPadding = (TIVO_HEIGHT - endHeight) - topPadding
 262                     settings.append('-padbottom')
 263                     settings.append(str(bottomPadding))
 264                 else:   #if only very small amount of padding needed, then just stretch it
 265                     settings.append('-s')
 266                     settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 267                 debug_write(__name__, fn_attr(), ['File is wider than 4:3 padding top and bottom\n', ' '.join(settings)])
 268
 269             return settings
 270         #If video is taller than 4:3 add left and right padding, this is rare. All of these files will always be sent in
 271         #an aspect ratio of 4:3 since they are so narrow.
 272         else:
 273             endWidth = int((TIVO_HEIGHT*width)/(height*multiplier4by3))
 274             settings.append('-aspect')
 275             settings.append('4:3')
 276             if endWidth % 2:
 277                 endWidth -= 1
 278             if endWidth < (TIVO_WIDTH * 0.99):
 279                 settings.append('-s')
 280                 settings.append(str(endWidth) + 'x' + str(TIVO_HEIGHT))
 281
 282                 leftPadding = ((TIVO_WIDTH - endWidth)/2)
 283                 if leftPadding % 2:
 284                     leftPadding -= 1
 285
 286                 settings.append('-padleft')
 287                 settings.append(str(leftPadding))
 288                 rightPadding = (TIVO_WIDTH - endWidth) - leftPadding
 289                 settings.append('-padright')
 290                 settings.append(str(rightPadding))
 291             else: #if only very small amount of padding needed, then just stretch it
 292                 settings.append('-s')
 293                 settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 294
 295             debug_write(__name__, fn_attr(), ['File is taller than 4:3 padding left and right\n', ' '.join(settings)])
 296
 297             return settings
 298
 299 def tivo_compatable(inFile, tsn = ''):
 300     supportedModes = [[720, 480], [704, 480], [544, 480], [528, 480], [480, 480], [352, 480]]
 301     type, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(inFile)
 302     #print type, width, height, fps, millisecs, kbps, akbps, acodec
 303
 304     if (inFile[-5:]).lower() == '.tivo':
 305         debug_write(__name__, fn_attr(), ['TRUE, ends with .tivo.', inFile])
 306         return True
 307
 308     if not type == 'mpeg2video':
 309         #print 'Not Tivo Codec'
 310         debug_write(__name__, fn_attr(), ['FALSE, type', type, 'not mpeg2video.', inFile])
 311         return False
 312
 313     if os.path.splitext(inFile)[-1].lower() in ('.ts', '.mpv'):
 314         debug_write(__name__, fn_attr(), ['FALSE, ext', os.path.splitext(inFile)[-1],\
 315                 'not tivo compatible.', inFile])
 316         return False
 317
 318     if acodec == 'dca':
 319         debug_write(__name__, fn_attr(), ['FALSE, acodec', acodec, ', not supported.', inFile])
 320         return False
 321
 322     if acodec != None:
 323         if not akbps or int(akbps) > config.getMaxAudioBR(tsn):
 324             debug_write(__name__, fn_attr(), ['FALSE,', akbps, 'kbps exceeds max audio bitrate.', inFile])
 325             return False
 326
 327     if kbps != None:
 328         abit = max('0', akbps)
 329         if int(kbps)-int(abit) > config.strtod(config.getMaxVideoBR())/1000:
 330             debug_write(__name__, fn_attr(), ['FALSE,', kbps, 'kbps exceeds max video bitrate.', inFile])
 331             return False
 332     else:
 333         debug_write(__name__, fn_attr(), ['FALSE,', kbps, 'kbps not supported.', inFile])
 334         return False
 335
 336     if config.isHDtivo(tsn):
 337         if par2 != 1.0:
 338             if config.getPixelAR(0):
 339                 if par2 != None or config.getPixelAR(1) != 1.0:
 340                     debug_write(__name__, fn_attr(), ['FALSE,', par2, 'not correct PAR,', inFile])
 341                     return False
 342         debug_write(__name__, fn_attr(), ['TRUE, HD Tivo detected, skipping remaining tests', inFile])
 343         return True
 344
 345     if not fps == '29.97':
 346         #print 'Not Tivo fps'
 347         debug_write(__name__, fn_attr(), ['FALSE,', fps, 'fps, should be 29.97.', inFile])
 348         return False
 349
 350     if not config.get169Setting(tsn):
 351         if dar1 == None or not dar1 in ('4:3', '8:9'):
 352             debug_write(__name__, fn_attr(), ['FALSE, DAR', dar1, 'not supported by BLACKLIST_169 tivos.', inFile])
 353             return False
 354
 355     for mode in supportedModes:
 356         if (mode[0], mode[1]) == (width, height):
 357             #print 'Is TiVo!'
 358             debug_write(__name__, fn_attr(), ['TRUE,', width, 'x', height, 'is valid.', inFile])
 359             return True
 360     #print 'Not Tivo dimensions'
 361     debug_write(__name__, fn_attr(), ['FALSE,', width, 'x', height, 'not in supported modes.', inFile])
 362     return False
 363
 364 def video_info(inFile):
 365     mtime = os.stat(inFile).st_mtime
 366     if inFile != videotest:
 367         if inFile in info_cache and info_cache[inFile][0] == mtime:
 368             debug_write(__name__, fn_attr(), ['CACHE HIT!', inFile])
 369             return info_cache[inFile][1]
 370
 371     if (inFile[-5:]).lower() == '.tivo':
 372         info_cache[inFile] = (mtime, (True, True, True, True, True, True, True, True, True, True, True, True, True))
 373         debug_write(__name__, fn_attr(), ['VALID, ends in .tivo.', inFile])
 374         return True, True, True, True, True, True, True, True, True, True, True, True, True
 375
 376     cmd = [ffmpeg_path(), '-i', inFile ]
 377     # Windows and other OS buffer 4096 and ffmpeg can output more than that.
 378     err_tmp = tempfile.TemporaryFile()
 379     ffmpeg = subprocess.Popen(cmd, stderr=err_tmp, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
 380
 381     # wait 10 sec if ffmpeg is not back give up
 382     for i in xrange(200):
 383         time.sleep(.05)
 384         if not ffmpeg.poll() == None:
 385             break
 386
 387     if ffmpeg.poll() == None:
 388         kill(ffmpeg.pid)
 389         info_cache[inFile] = (mtime, (None, None, None, None, None, None, None, None, None, None, None, None, None))
 390         return None, None, None, None, None, None, None, None, None, None, None, None, None
 391
 392     err_tmp.seek(0)
 393     output = err_tmp.read()
 394     err_tmp.close()
 395     debug_write(__name__, fn_attr(), ['ffmpeg output=', output])
 396
 397     rezre = re.compile(r'.*Video: ([^,]+),.*')
 398     x = rezre.search(output)
 399     if x:
 400         codec = x.group(1)
 401     else:
 402         info_cache[inFile] = (mtime, (None, None, None, None, None, None, None, None, None, None, None, None, None))
 403         debug_write(__name__, fn_attr(), ['failed at video codec'])
 404         return None, None, None, None, None, None, None, None, None, None, None, None, None
 405
 406     rezre = re.compile(r'.*Video: .+, (\d+)x(\d+)[, ].*')
 407     x = rezre.search(output)
 408     if x:
 409         width = int(x.group(1))
 410         height = int(x.group(2))
 411     else:
 412         info_cache[inFile] = (mtime, (None, None, None, None, None, None, None, None, None, None, None, None, None))
 413         debug_write(__name__, fn_attr(), ['failed at width/height'])
 414         return None, None, None, None, None, None, None, None, None, None, None, None, None
 415
 416     rezre = re.compile(r'.*Video: .+, (.+) (?:fps|tb).*')
 417     x = rezre.search(output)
 418     if x:
 419         fps = x.group(1)
 420     else:
 421         info_cache[inFile] = (mtime, (None, None, None, None, None, None, None, None, None, None, None, None, None))
 422         debug_write(__name__, fn_attr(), ['failed at fps'])
 423         return None, None, None, None, None, None, None, None, None, None, None, None, None
 424
 425     # Allow override only if it is mpeg2 and frame rate was doubled to 59.94
 426     if (not fps == '29.97') and (codec == 'mpeg2video'):
 427         # First look for the build 7215 version
 428         rezre = re.compile(r'.*film source: 29.97.*')
 429         x = rezre.search(output.lower() )
 430         if x:
 431             debug_write(__name__, fn_attr(), ['film source: 29.97 setting fps to 29.97'])
 432             fps = '29.97'
 433         else:
 434             # for build 8047:
 435             rezre = re.compile(r'.*frame rate differs from container frame rate: 29.97.*')
 436             debug_write(__name__, fn_attr(), ['Bug in VideoReDo'])
 437             x = rezre.search(output.lower() )
 438             if x:
 439                 fps = '29.97'
 440
 441     durre = re.compile(r'.*Duration: (.{2}):(.{2}):(.{2})\.(.),')
 442     d = durre.search(output)
 443     if d:
 444         millisecs = ((int(d.group(1))*3600) + (int(d.group(2))*60) + int(d.group(3)))*1000 + (int(d.group(4))*100)
 445     else:
 446         millisecs = 0
 447
 448     #get bitrate of source for tivo compatibility test.
 449     rezre = re.compile(r'.*bitrate: (.+) (?:kb/s).*')
 450     x = rezre.search(output)
 451     if x:
 452         kbps = x.group(1)
 453     else:
 454         kbps = None
 455         debug_write(__name__, fn_attr(), ['failed at kbps'])
 456
 457     #get audio bitrate of source for tivo compatibility test.
 458     rezre = re.compile(r'.*Audio: .+, (.+) (?:kb/s).*')
 459     x = rezre.search(output)
 460     if x:
 461         akbps = x.group(1)
 462     else:
 463         akbps = None
 464         debug_write(__name__, fn_attr(), ['failed at akbps'])
 465
 466     #get audio codec of source for tivo compatibility test.
 467     rezre = re.compile(r'.*Audio: ([^,]+),.*')
 468     x = rezre.search(output)
 469     if x:
 470         acodec = x.group(1)
 471     else:
 472         acodec = None
 473         debug_write(__name__, fn_attr(), ['failed at acodec'])
 474
 475     #get audio frequency of source for tivo compatibility test.
 476     rezre = re.compile(r'.*Audio: .+, (.+) (?:Hz).*')
 477     x = rezre.search(output)
 478     if x:
 479         afreq = x.group(1)
 480     else:
 481         afreq = None
 482         debug_write(__name__, fn_attr(), ['failed at afreq'])
 483
 484     #get par.
 485     rezre = re.compile(r'.*Video: .+PAR ([0-9]+):([0-9]+) DAR [0-9:]+.*')
 486     x = rezre.search(output)
 487     if x and x.group(1)!="0" and x.group(2)!="0":
 488         par1, par2 = x.group(1)+':'+x.group(2), float(x.group(1))/float(x.group(2))
 489     else:
 490         par1, par2 = None, None
 491
 492     #get dar.
 493     rezre = re.compile(r'.*Video: .+DAR ([0-9]+):([0-9]+).*')
 494     x = rezre.search(output)
 495     if x and x.group(1)!="0" and x.group(2)!="0":
 496         dar1, dar2 = x.group(1)+':'+x.group(2), float(x.group(1))/float(x.group(2))
 497     else:
 498         dar1, dar2 = None, None
 499
 500     info_cache[inFile] = (mtime, (codec, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2))
 501     debug_write(__name__, fn_attr(), ['Codec=', codec, ' width=', width, ' height=', height, ' fps=', fps, ' millisecs=', millisecs, ' kbps=', kbps, ' akbps=', akbps, ' acodec=', acodec, ' afreq=', afreq, ' par=', par1, par2, ' dar=', dar1, dar2])
 502     return codec, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2
 503
 504 def video_check(inFile, cmd_string):
 505     cmd = [ffmpeg_path(), '-i', inFile] + cmd_string.split()
 506     ffmpeg = subprocess.Popen(cmd, stdout=subprocess.PIPE)
 507     try:
 508         shutil.copyfileobj(ffmpeg.stdout, open(videotest, 'wb'))
 509         return True
 510     except:
 511         kill(ffmpeg.pid)
 512         return False
 513
 514 def supported_format(inFile):
 515     if video_info(inFile)[0]:
 516         return True
 517     else:
 518         debug_write(__name__, fn_attr(), ['FALSE, file not supported', inFile])
 519         return False
 520
 521 def kill(pid):
 522     debug_write(__name__, fn_attr(), ['killing pid=', str(pid)])
 523     if mswindows:
 524         win32kill(pid)
 525     else:
 526         import os, signal
 527         os.kill(pid, signal.SIGTERM)
 528
 529 def win32kill(pid):
 530         import ctypes
 531         handle = ctypes.windll.kernel32.OpenProcess(1, False, pid)
 532         ctypes.windll.kernel32.TerminateProcess(handle, -1)
 533         ctypes.windll.kernel32.CloseHandle(handle)
 534
 535 def gcd(a,b):
 536     while b:
 537         a, b = b, a % b
 538     return a
 539