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(inFile, 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(inFile, tsn):
 114     return '-b '+select_videostr(inFile, tsn)
 115
 116 def select_videostr(inFile, tsn):
 117     video_str = config.getVideoBR(tsn)
 118     if config.isHDtivo(tsn):
 119         type, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(inFile)
 120         if kbps != None and config.getVideoPCT() > 0:
 121             video_percent = int(kbps)*10*config.getVideoPCT()
 122             video_bitrate = max(config.strtod(video_str), video_percent)
 123             video_str = str(int(min(config.strtod(config.getMaxVideoBR())*0.95, video_bitrate)))
 124     return video_str
 125
 126 def select_audiobr(tsn):
 127     return '-ab '+config.getAudioBR(tsn)
 128
 129 def select_maxvideobr():
 130     return '-maxrate '+config.getMaxVideoBR()
 131
 132 def select_buffsize():
 133     return '-bufsize '+config.getBuffSize()
 134
 135 def select_ffmpegprams(tsn):
 136     if config.getFFmpegPrams(tsn) != None:
 137         return config.getFFmpegPrams(tsn)
 138     return ''
 139
 140 def select_format(tsn):
 141     fmt = 'vob'
 142     if config.getFormat(tsn) != None:
 143         fmt = config.getFormat(tsn)
 144     return '-f '+fmt+' -'
 145
 146 def select_aspect(inFile, tsn = ''):
 147     TIVO_WIDTH = config.getTivoWidth(tsn)
 148     TIVO_HEIGHT = config.getTivoHeight(tsn)
 149
 150     type, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(inFile)
 151
 152     debug_write(__name__, fn_attr(), ['tsn:', tsn])
 153
 154     aspect169 = config.get169Setting(tsn)
 155
 156     debug_write(__name__, fn_attr(), ['aspect169:', aspect169])
 157
 158     optres = config.getOptres(tsn)
 159
 160     debug_write(__name__, fn_attr(), ['optres:', optres])
 161
 162     if optres:
 163         optHeight = config.nearestTivoHeight(height)
 164         optWidth = config.nearestTivoWidth(width)
 165         if optHeight < TIVO_HEIGHT:
 166             TIVO_HEIGHT = optHeight
 167         if optWidth < TIVO_WIDTH:
 168             TIVO_WIDTH = optWidth
 169
 170     d = gcd(height,width)
 171     ratio = (width*100)/height
 172     rheight, rwidth = height/d, width/d
 173
 174     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])
 175
 176     multiplier16by9 = (16.0 * TIVO_HEIGHT) / (9.0 * TIVO_WIDTH)
 177     multiplier4by3  =  (4.0 * TIVO_HEIGHT) / (3.0 * TIVO_WIDTH)
 178
 179     if config.isHDtivo(tsn) and not optres:
 180         if config.getPixelAR(0):
 181             if par2 == None:
 182                 npar = config.getPixelAR(1)
 183             else:
 184                 npar = par2
 185             # adjust for pixel aspect ratio, if set, because TiVo expects square pixels
 186             if npar<1.0:
 187                 return ['-s', str(width) + 'x' + str(int(math.ceil(height/npar)))]
 188             elif npar>1.0:
 189                 # FFMPEG expects width to be a multiple of two
 190                 return ['-s', str(int(math.ceil(width*npar/2.0)*2)) + 'x' + str(height)]
 191         if height <= TIVO_HEIGHT:
 192             # pass all resolutions to S3, except heights greater than conf height
 193             return []
 194         # else, resize video.
 195     if (rwidth, rheight) in [(1, 1)] and par1 == '8:9':
 196         debug_write(__name__, fn_attr(), ['File + PAR is within 4:3.'])
 197         return ['-aspect', '4:3', '-s', str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT)]
 198     elif (rwidth, rheight) in [(4, 3), (10, 11), (15, 11), (59, 54), (59, 72), (59, 36), (59, 54)] or dar1 == '4:3':
 199         debug_write(__name__, fn_attr(), ['File is within 4:3 list.'])
 200         return ['-aspect', '4:3', '-s', str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT)]
 201     elif ((rwidth, rheight) in [(16, 9), (20, 11), (40, 33), (118, 81), (59, 27)] or dar1 == '16:9') and aspect169:
 202         debug_write(__name__, fn_attr(), ['File is within 16:9 list and 16:9 allowed.'])
 203         return ['-aspect', '16:9', '-s', str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT)]
 204     else:
 205         settings = []
 206         #If video is wider than 4:3 add top and bottom padding
 207         if (ratio > 133): #Might be 16:9 file, or just need padding on top and bottom
 208             if aspect169 and (ratio > 135): #If file would fall in 4:3 assume it is supposed to be 4:3
 209                 if (ratio > 177):#too short needs padding top and bottom
 210                     endHeight = int(((TIVO_WIDTH*height)/width) * multiplier16by9)
 211                     settings.append('-aspect')
 212                     settings.append('16:9')
 213                     if endHeight % 2:
 214                         endHeight -= 1
 215                     if endHeight < TIVO_HEIGHT * 0.99:
 216                         settings.append('-s')
 217                         settings.append(str(TIVO_WIDTH) + 'x' + str(endHeight))
 218
 219                         topPadding = ((TIVO_HEIGHT - endHeight)/2)
 220                         if topPadding % 2:
 221                             topPadding -= 1
 222
 223                         settings.append('-padtop')
 224                         settings.append(str(topPadding))
 225                         bottomPadding = (TIVO_HEIGHT - endHeight) - topPadding
 226                         settings.append('-padbottom')
 227                         settings.append(str(bottomPadding))
 228                     else:   #if only very small amount of padding needed, then just stretch it
 229                         settings.append('-s')
 230                         settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 231                     debug_write(__name__, fn_attr(), ['16:9 aspect allowed, file is wider than 16:9 padding top and bottom', ' '.join(settings)])
 232                 else: #too skinny needs padding on left and right.
 233                     endWidth = int((TIVO_HEIGHT*width)/(height*multiplier16by9))
 234                     settings.append('-aspect')
 235                     settings.append('16:9')
 236                     if endWidth % 2:
 237                         endWidth -= 1
 238                     if endWidth < (TIVO_WIDTH-10):
 239                         settings.append('-s')
 240                         settings.append(str(endWidth) + 'x' + str(TIVO_HEIGHT))
 241
 242                         leftPadding = ((TIVO_WIDTH - endWidth)/2)
 243                         if leftPadding % 2:
 244                             leftPadding -= 1
 245
 246                         settings.append('-padleft')
 247                         settings.append(str(leftPadding))
 248                         rightPadding = (TIVO_WIDTH - endWidth) - leftPadding
 249                         settings.append('-padright')
 250                         settings.append(str(rightPadding))
 251                     else: #if only very small amount of padding needed, then just stretch it
 252                         settings.append('-s')
 253                         settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 254                     debug_write(__name__, fn_attr(), ['16:9 aspect allowed, file is narrower than 16:9 padding left and right\n', ' '.join(settings)])
 255             else: #this is a 4:3 file or 16:9 output not allowed
 256                 settings.append('-aspect')
 257                 settings.append('4:3')
 258                 endHeight = int(((TIVO_WIDTH*height)/width) * multiplier4by3)
 259                 if endHeight % 2:
 260                     endHeight -= 1
 261                 if endHeight < TIVO_HEIGHT * 0.99:
 262                     settings.append('-s')
 263                     settings.append(str(TIVO_WIDTH) + 'x' + str(endHeight))
 264
 265                     topPadding = ((TIVO_HEIGHT - endHeight)/2)
 266                     if topPadding % 2:
 267                         topPadding -= 1
 268
 269                     settings.append('-padtop')
 270                     settings.append(str(topPadding))
 271                     bottomPadding = (TIVO_HEIGHT - endHeight) - topPadding
 272                     settings.append('-padbottom')
 273                     settings.append(str(bottomPadding))
 274                 else:   #if only very small amount of padding needed, then just stretch it
 275                     settings.append('-s')
 276                     settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 277                 debug_write(__name__, fn_attr(), ['File is wider than 4:3 padding top and bottom\n', ' '.join(settings)])
 278
 279             return settings
 280         #If video is taller than 4:3 add left and right padding, this is rare. All of these files will always be sent in
 281         #an aspect ratio of 4:3 since they are so narrow.
 282         else:
 283             endWidth = int((TIVO_HEIGHT*width)/(height*multiplier4by3))
 284             settings.append('-aspect')
 285             settings.append('4:3')
 286             if endWidth % 2:
 287                 endWidth -= 1
 288             if endWidth < (TIVO_WIDTH * 0.99):
 289                 settings.append('-s')
 290                 settings.append(str(endWidth) + 'x' + str(TIVO_HEIGHT))
 291
 292                 leftPadding = ((TIVO_WIDTH - endWidth)/2)
 293                 if leftPadding % 2:
 294                     leftPadding -= 1
 295
 296                 settings.append('-padleft')
 297                 settings.append(str(leftPadding))
 298                 rightPadding = (TIVO_WIDTH - endWidth) - leftPadding
 299                 settings.append('-padright')
 300                 settings.append(str(rightPadding))
 301             else: #if only very small amount of padding needed, then just stretch it
 302                 settings.append('-s')
 303                 settings.append(str(TIVO_WIDTH) + 'x' + str(TIVO_HEIGHT))
 304
 305             debug_write(__name__, fn_attr(), ['File is taller than 4:3 padding left and right\n', ' '.join(settings)])
 306
 307             return settings
 308
 309 def tivo_compatable(inFile, tsn = ''):
 310     supportedModes = [[720, 480], [704, 480], [544, 480], [528, 480], [480, 480], [352, 480]]
 311     type, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2 =  video_info(inFile)
 312     #print type, width, height, fps, millisecs, kbps, akbps, acodec
 313
 314     if (inFile[-5:]).lower() == '.tivo':
 315         debug_write(__name__, fn_attr(), ['TRUE, ends with .tivo.', inFile])
 316         return True
 317
 318     if not type == 'mpeg2video':
 319         #print 'Not Tivo Codec'
 320         debug_write(__name__, fn_attr(), ['FALSE, type', type, 'not mpeg2video.', inFile])
 321         return False
 322
 323     if os.path.splitext(inFile)[-1].lower() in ('.ts', '.mpv'):
 324         debug_write(__name__, fn_attr(), ['FALSE, ext', os.path.splitext(inFile)[-1],\
 325                 'not tivo compatible.', inFile])
 326         return False
 327
 328     if acodec == 'dca':
 329         debug_write(__name__, fn_attr(), ['FALSE, acodec', acodec, ', not supported.', inFile])
 330         return False
 331
 332     if acodec != None:
 333         if not akbps or int(akbps) > config.getMaxAudioBR(tsn):
 334             debug_write(__name__, fn_attr(), ['FALSE,', akbps, 'kbps exceeds max audio bitrate.', inFile])
 335             return False
 336
 337     if kbps != None:
 338         abit = max('0', akbps)
 339         if int(kbps)-int(abit) > config.strtod(config.getMaxVideoBR())/1000:
 340             debug_write(__name__, fn_attr(), ['FALSE,', kbps, 'kbps exceeds max video bitrate.', inFile])
 341             return False
 342     else:
 343         debug_write(__name__, fn_attr(), ['FALSE,', kbps, 'kbps not supported.', inFile])
 344         return False
 345
 346     if config.isHDtivo(tsn):
 347         if par2 != 1.0:
 348             if config.getPixelAR(0):
 349                 if par2 != None or config.getPixelAR(1) != 1.0:
 350                     debug_write(__name__, fn_attr(), ['FALSE,', par2, 'not correct PAR,', inFile])
 351                     return False
 352         debug_write(__name__, fn_attr(), ['TRUE, HD Tivo detected, skipping remaining tests', inFile])
 353         return True
 354
 355     if not fps == '29.97':
 356         #print 'Not Tivo fps'
 357         debug_write(__name__, fn_attr(), ['FALSE,', fps, 'fps, should be 29.97.', inFile])
 358         return False
 359
 360     if not config.get169Setting(tsn):
 361         if dar1 == None or not dar1 in ('4:3', '8:9'):
 362             debug_write(__name__, fn_attr(), ['FALSE, DAR', dar1, 'not supported by BLACKLIST_169 tivos.', inFile])
 363             return False
 364
 365     for mode in supportedModes:
 366         if (mode[0], mode[1]) == (width, height):
 367             #print 'Is TiVo!'
 368             debug_write(__name__, fn_attr(), ['TRUE,', width, 'x', height, 'is valid.', inFile])
 369             return True
 370     #print 'Not Tivo dimensions'
 371     debug_write(__name__, fn_attr(), ['FALSE,', width, 'x', height, 'not in supported modes.', inFile])
 372     return False
 373
 374 def video_info(inFile):
 375     mtime = os.stat(inFile).st_mtime
 376     if inFile != videotest:
 377         if inFile in info_cache and info_cache[inFile][0] == mtime:
 378             debug_write(__name__, fn_attr(), ['CACHE HIT!', inFile])
 379             return info_cache[inFile][1]
 380
 381     if (inFile[-5:]).lower() == '.tivo':
 382         info_cache[inFile] = (mtime, (True, True, True, True, True, True, True, True, True, True, True, True, True))
 383         debug_write(__name__, fn_attr(), ['VALID, ends in .tivo.', inFile])
 384         return True, True, True, True, True, True, True, True, True, True, True, True, True
 385
 386     cmd = [ffmpeg_path(), '-i', inFile ]
 387     # Windows and other OS buffer 4096 and ffmpeg can output more than that.
 388     err_tmp = tempfile.TemporaryFile()
 389     ffmpeg = subprocess.Popen(cmd, stderr=err_tmp, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
 390
 391     # wait 10 sec if ffmpeg is not back give up
 392     for i in xrange(200):
 393         time.sleep(.05)
 394         if not ffmpeg.poll() == None:
 395             break
 396
 397     if ffmpeg.poll() == None:
 398         kill(ffmpeg.pid)
 399         info_cache[inFile] = (mtime, (None, None, None, None, None, None, None, None, None, None, None, None, None))
 400         return None, None, None, None, None, None, None, None, None, None, None, None, None
 401
 402     err_tmp.seek(0)
 403     output = err_tmp.read()
 404     err_tmp.close()
 405     debug_write(__name__, fn_attr(), ['ffmpeg output=', output])
 406
 407     rezre = re.compile(r'.*Video: ([^,]+),.*')
 408     x = rezre.search(output)
 409     if x:
 410         codec = x.group(1)
 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 video codec'])
 414         return None, None, None, None, None, None, None, None, None, None, None, None, None
 415
 416     rezre = re.compile(r'.*Video: .+, (\d+)x(\d+)[, ].*')
 417     x = rezre.search(output)
 418     if x:
 419         width = int(x.group(1))
 420         height = int(x.group(2))
 421     else:
 422         info_cache[inFile] = (mtime, (None, None, None, None, None, None, None, None, None, None, None, None, None))
 423         debug_write(__name__, fn_attr(), ['failed at width/height'])
 424         return None, None, None, None, None, None, None, None, None, None, None, None, None
 425
 426     rezre = re.compile(r'.*Video: .+, (.+) (?:fps|tb).*')
 427     x = rezre.search(output)
 428     if x:
 429         fps = x.group(1)
 430     else:
 431         info_cache[inFile] = (mtime, (None, None, None, None, None, None, None, None, None, None, None, None, None))
 432         debug_write(__name__, fn_attr(), ['failed at fps'])
 433         return None, None, None, None, None, None, None, None, None, None, None, None, None
 434
 435     # Allow override only if it is mpeg2 and frame rate was doubled to 59.94
 436     if (not fps == '29.97') and (codec == 'mpeg2video'):
 437         # First look for the build 7215 version
 438         rezre = re.compile(r'.*film source: 29.97.*')
 439         x = rezre.search(output.lower() )
 440         if x:
 441             debug_write(__name__, fn_attr(), ['film source: 29.97 setting fps to 29.97'])
 442             fps = '29.97'
 443         else:
 444             # for build 8047:
 445             rezre = re.compile(r'.*frame rate differs from container frame rate: 29.97.*')
 446             debug_write(__name__, fn_attr(), ['Bug in VideoReDo'])
 447             x = rezre.search(output.lower() )
 448             if x:
 449                 fps = '29.97'
 450
 451     durre = re.compile(r'.*Duration: (.{2}):(.{2}):(.{2})\.(.),')
 452     d = durre.search(output)
 453     if d:
 454         millisecs = ((int(d.group(1))*3600) + (int(d.group(2))*60) + int(d.group(3)))*1000 + (int(d.group(4))*100)
 455     else:
 456         millisecs = 0
 457
 458     #get bitrate of source for tivo compatibility test.
 459     rezre = re.compile(r'.*bitrate: (.+) (?:kb/s).*')
 460     x = rezre.search(output)
 461     if x:
 462         kbps = x.group(1)
 463     else:
 464         kbps = None
 465         debug_write(__name__, fn_attr(), ['failed at kbps'])
 466
 467     #get audio bitrate of source for tivo compatibility test.
 468     rezre = re.compile(r'.*Audio: .+, (.+) (?:kb/s).*')
 469     x = rezre.search(output)
 470     if x:
 471         akbps = x.group(1)
 472     else:
 473         akbps = None
 474         debug_write(__name__, fn_attr(), ['failed at akbps'])
 475
 476     #get audio codec of source for tivo compatibility test.
 477     rezre = re.compile(r'.*Audio: ([^,]+),.*')
 478     x = rezre.search(output)
 479     if x:
 480         acodec = x.group(1)
 481     else:
 482         acodec = None
 483         debug_write(__name__, fn_attr(), ['failed at acodec'])
 484
 485     #get audio frequency of source for tivo compatibility test.
 486     rezre = re.compile(r'.*Audio: .+, (.+) (?:Hz).*')
 487     x = rezre.search(output)
 488     if x:
 489         afreq = x.group(1)
 490     else:
 491         afreq = None
 492         debug_write(__name__, fn_attr(), ['failed at afreq'])
 493
 494     #get par.
 495     rezre = re.compile(r'.*Video: .+PAR ([0-9]+):([0-9]+) DAR [0-9:]+.*')
 496     x = rezre.search(output)
 497     if x and x.group(1)!="0" and x.group(2)!="0":
 498         par1, par2 = x.group(1)+':'+x.group(2), float(x.group(1))/float(x.group(2))
 499     else:
 500         par1, par2 = None, None
 501
 502     #get dar.
 503     rezre = re.compile(r'.*Video: .+DAR ([0-9]+):([0-9]+).*')
 504     x = rezre.search(output)
 505     if x and x.group(1)!="0" and x.group(2)!="0":
 506         dar1, dar2 = x.group(1)+':'+x.group(2), float(x.group(1))/float(x.group(2))
 507     else:
 508         dar1, dar2 = None, None
 509
 510     info_cache[inFile] = (mtime, (codec, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2))
 511     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])
 512     return codec, width, height, fps, millisecs, kbps, akbps, acodec, afreq, par1, par2, dar1, dar2
 513
 514 def video_check(inFile, cmd_string):
 515     cmd = [ffmpeg_path(), '-i', inFile] + cmd_string.split()
 516     ffmpeg = subprocess.Popen(cmd, stdout=subprocess.PIPE)
 517     try:
 518         shutil.copyfileobj(ffmpeg.stdout, open(videotest, 'wb'))
 519         return True
 520     except:
 521         kill(ffmpeg.pid)
 522         return False
 523
 524 def supported_format(inFile):
 525     if video_info(inFile)[0]:
 526         return True
 527     else:
 528         debug_write(__name__, fn_attr(), ['FALSE, file not supported', inFile])
 529         return False
 530
 531 def kill(pid):
 532     debug_write(__name__, fn_attr(), ['killing pid=', str(pid)])
 533     if mswindows:
 534         win32kill(pid)
 535     else:
 536         import os, signal
 537         os.kill(pid, signal.SIGTERM)
 538
 539 def win32kill(pid):
 540         import ctypes
 541         handle = ctypes.windll.kernel32.OpenProcess(1, False, pid)
 542         ctypes.windll.kernel32.TerminateProcess(handle, -1)
 543         ctypes.windll.kernel32.CloseHandle(handle)
 544
 545 def gcd(a,b):
 546     while b:
 547         a, b = b, a % b
 548     return a
 549