38:
98:
477:
To help prevent these problems, SMPTE time code contains a color framing bit, which can be used to indicate that the video material the timecode refers to follows a standard convention regarding the synchronization of video time code and the color framing sequence. If the color framing bit was set in
82:
As a practical matter, VITC can be more 'frame-accurate' than LTC, particularly at very slow tape speeds on analog formats. LTC readers can lose track of code at slow jog speeds whereas VITC can be read frame-by-frame if need be. Conversely, at high speeds (FF/rew.), the VITC is often unreadable due
473:
Preserving the color framing sequence of video across edits and between channels in video effects was an important issue in early analog composite videotape editing systems, as cuts between different color sequences would cause jumps in subcarrier phase, and mixing two signals of different field
441:
Field flag (bit 35 for 29.97/30 frame/s, bit 75 for 25 frame/s): This is an additional least-significant bit for the frame number, distinguishing the two interlaced fields in one video frame. It is set to 0 during the first field of a frame, and to 1 during the second. This bit replaces the
469:
The exact nature of the color frame sequence depends on the video standard being used. In the case of the three main composite video standards, PAL video has an 8-field (4 frame) color frame sequence, and NTSC and SECAM both have 4-field (2 frame) color frame sequences.
445:"Binary group flag" bits BGF0 and BGF2 (bits 55 and 75 for 29.97/30 frame/s, bits 35 and 55 for 25 frame/s): These indicate the format of the user bits. Both bits zero indicates no (or unspecified) format. Only BGF0 set indicates four 8-bit characters (transmitted
478:
both types of material, the editing system could then always ensure that color framing was preserved by constraining edit decisions between input sources to keep the correct relationship between the timecode sequences, and hence the color framing sequences.
78:
A video frame may contain more than one VITC code if necessary, recorded on different lines. This is often used in production, where different entities may want to encode different sets of time-code metadata on the same tape.
412:
numbering is in use; frame numbers 0 and 1 are skipped during the first second of every minute, except multiples of 10 minutes. This converts 30 frame/second time code to the 29.97 frame/second
454:
Bit 74 ("Binary group flag 1") was previously unassigned, but is used to indicate that the time code is synchronized to an external clock. If zero, the timecode start time is arbitrary.
542:
Recommendation ITU-R BR.780-2: Time and control code standards, for production applications in order to facilitate the international exchange of television programmes on magnetic tapes
71:(LTC), embedded in a new frame structure with extra synchronization bits and an error-detection checksum. The exception is that VITC is encoded twice per
41:
VITC Timecode, presented in the VBI space above the active picture area of a SVHS-C camcorder tape. (928x624 crop of 4fsc 1135x625 25i PAL frame via
83:
to image distortions, so the LTC is often used instead. Some VCRs have an auto selection between the two formats to provide the highest accuracy.
86:
VITC is 90 bits long: 32 bits of time code, 32 bits of user data, 18 synchronization bits, and 8 bits of checksum. It is transmitted using
562:
1368:
1292:
1236:
1195:
1625:
624:
823:
593:
This is an example of the 25 frame/s bit assignments, which are different from the more commonly seen 30/29.97 bit assignments.
474:
dominance would result in color artifacts on the part of the signal that was not in sync with the output color frame sequence.
1436:
581:
Indian
Standard IS: 12429 (Part 2) Time and Control Code for Video Tape Recorders: Part 2 Vertical-Interval Time Code (VITC)
1282:
1218:
31:
1656:
461:
the sync bits, so bit 82 is the XOR of bits 74, 66, ..., 2), which can be described as a CRC with generator polynomial
423:
bit, is set to 1 if the time code is synchronized to a (color) video signal. The frame number modulo 2 (for NTSC and
1143:
1594:
1358:
1287:
785:
1109:
1045:
969:
1406:
1322:
1009:
933:
857:
1228:
1210:
75:
frame, once in each field, and one additional bit (the "field flag") is used to distinguish the two fields.
30:"VITC" redirects here. For the South African music Festival often referred to as "Vodacom In The City", see
1589:
1426:
1340:
515:
91:
1014:
617:
1353:
1297:
1126:
1062:
1004:
999:
994:
989:
984:
979:
928:
918:
665:
588:
90:
encoding at a bit rate of 115 times the line rate. (The unused 25 bit times are to leave room for the
61:
1568:
1457:
1102:
1097:
1087:
913:
510:
409:
1477:
908:
1277:
1599:
953:
610:
432:
579:
438:
Bits 35, 55, and 75 differ between 25 frame/s time code, and 30/29.97 frame/s. The bits are:
1584:
1431:
1421:
1411:
1269:
974:
37:
1619:
1579:
1302:
948:
872:
17:
8:
1574:
1165:
559:
60:
encoded on one scan line in a video signal. These lines are typically inserted into the
1651:
1401:
1028:
87:
807:
1467:
1416:
898:
656:
495:
540:
1614:
1079:
1037:
72:
1609:
1441:
566:
490:
68:
42:
1564:
1559:
1462:
1390:
1378:
1173:
877:
57:
1645:
1386:
1251:
1153:
1148:
803:
763:
759:
755:
751:
747:
743:
739:
735:
731:
691:
673:
505:
457:
The checksum in bits 82–89 is a simple bytewise XOR of the previous 82 bits (
446:
420:
882:
849:
703:
500:
602:
97:
938:
1396:
1330:
1241:
1200:
431:) should be preserved across cuts in order to avoid phase jumps in the
1604:
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723:
683:
1482:
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1348:
923:
862:
795:
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1259:
775:
903:
839:
699:
771:
1136:
1067:
867:
779:
713:
707:
633:
424:
67:
With one exception, VITC contains the same payload as SMPTE
1554:
1307:
1190:
1131:
1119:
1114:
1092:
1055:
1050:
695:
413:
1178:
767:
546:
428:
181:
101:
VITC Timecode - via digital 720x512 NTSC export process.
351:
296:
241:
186:
1643:
449:). The combinations with BGF2 set are reserved.
618:
442:"polarity correction" bit in linear timecode.
632:
392:
334:
331:
279:
276:
224:
221:
166:
163:
625:
611:
535:
533:
531:
1513:
1511:
96:
36:
528:
14:
1644:
1505:Also used in China's DVB-S/S2 network.
1543:
1508:
1501:
1499:
644:
606:
1544:
465:+1. (Preset to zero, no inversion.)
56:, pronounced "vitsee") is a form of
32:In the City (South African festival)
486:Related technologies and standards
24:
1496:
27:Type of timecode in a video signal
25:
1668:
106:SMPTE vertical interval timecode
382:
378:
375:
368:
357:
327:
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313:
302:
272:
268:
258:
247:
217:
213:
210:
203:
192:
159:
645:
572:
553:
13:
1:
1010:Field-sequential color system
560:Timecode bit assignment table
521:
1590:Reverse Standards Conversion
516:Rewritable consumer timecode
92:horizontal blanking interval
7:
481:
108:(compliant with SMPTE 12M)
10:
1673:
589:Bureau of Indian Standards
62:vertical blanking interval
50:Vertical Interval Timecode
29:
1657:Film and video technology
1550:
1539:
1491:
1450:
1377:
1339:
1321:
1268:
1250:
1227:
1209:
1164:
1078:
1036:
1027:
962:
891:
848:
832:
816:
794:
722:
682:
664:
655:
651:
640:
511:AES-EBU embedded timecode
364:
361:
358:
328:
309:
306:
303:
273:
254:
251:
248:
218:
199:
196:
193:
160:
120:
117:
114:
565:January 5, 2011, at the
634:Broadcast video formats
1600:Television transmitter
591:. 2002 . pp. 2–5.
433:chrominance subcarrier
408:Bit 14 is set to 1 if
102:
46:
1585:MPEG transport stream
1412:MPEG-1 Audio Layer II
975:Mechanical television
883:Zweikanalton (A2/IGR)
100:
64:of the video signal.
40:
1620:Widescreen signaling
1595:Standards conversion
1580:Moving image formats
1575:Display motion blur
427:) or modulo 4 (for
109:
1626:Analogue TV Topics
189:(0–23, 24, or 29)
105:
103:
88:non-return-to-zero
47:
1639:
1638:
1635:
1634:
1535:
1534:
1531:
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1527:
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1417:MPEG Multichannel
1023:
1022:
569:, Charles Poynton
496:Burnt-in timecode
405:
404:
16:(Redirected from
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1615:Video processing
1545:Technical issues
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766:(Color systems:
694:(Color systems:
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126: Bit
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73:interlaced video
21:
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1610:Video on demand
1555:14:9 compromise
1546:
1523:
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1516:
1509:
1504:
1497:
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1446:
1442:MPEG-H 3D Audio
1373:
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1317:
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958:
887:
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718:
678:
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597:
584:
578:
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567:Wayback Machine
558:
554:
539:
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524:
491:Linear timecode
484:
353:
298:
243:
188:
107:
69:linear timecode
35:
28:
23:
22:
15:
12:
11:
5:
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1637:
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1607:
1602:
1597:
1592:
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1565:Digital cinema
1562:
1560:Broadcast-safe
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1463:Broadcast flag
1460:
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1452:
1451:Hidden signals
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1018:
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1007:
1002:
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987:
982:
977:
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964:
960:
959:
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951:
946:
941:
936:
931:
926:
921:
916:
911:
906:
901:
895:
893:
892:Hidden signals
889:
888:
886:
885:
880:
878:Sound-in-Syncs
875:
870:
865:
860:
854:
852:
846:
845:
843:
842:
836:
834:
830:
829:
827:
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820:
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814:
813:
811:
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800:
798:
792:
791:
789:
788:
783:
728:
726:
720:
719:
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711:
688:
686:
680:
679:
677:
676:
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668:
659:
649:
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638:
637:
630:
629:
622:
615:
607:
596:
595:
571:
552:
549:. 2005-04-08 .
526:
525:
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519:
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508:
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498:
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480:
467:
466:
455:
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436:
417:
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402:
391:
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377:
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171:
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162:
158:
157:
156: 9
154:
153: 8
151:
150: 7
148:
147: 6
145:
144: 5
142:
141: 4
139:
138: 3
136:
135: 2
133:
132: 1
130:
129: 0
127:
123:
122:
119:
116:
113:
58:SMPTE timecode
26:
9:
6:
4:
3:
2:
1669:
1658:
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1500:
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1471:
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1403:
1400:
1398:
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1392:
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1362:
1360:
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1326:
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1320:
1314:
1311:
1309:
1306:
1304:
1301:
1299:
1296:
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1291:
1289:
1286:
1284:
1281:
1279:
1276:
1275:
1273:
1271:
1267:
1261:
1258:
1257:
1255:
1253:
1252:MPEG-4 Visual
1249:
1243:
1240:
1238:
1235:
1234:
1232:
1230:
1226:
1220:
1217:
1216:
1214:
1212:
1208:
1202:
1199:
1197:
1194:
1192:
1189:
1185:
1182:
1181:
1180:
1177:
1175:
1172:
1171:
1169:
1167:
1163:
1155:
1152:
1150:
1147:
1146:
1145:
1142:
1138:
1135:
1133:
1130:
1129:
1128:
1125:
1121:
1118:
1116:
1113:
1112:
1111:
1108:
1104:
1101:
1099:
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1026:
1016:
1013:
1011:
1008:
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1001:
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993:
991:
988:
986:
983:
981:
978:
976:
973:
971:
968:
967:
965:
961:
955:
952:
950:
947:
945:
942:
940:
937:
935:
932:
930:
927:
925:
922:
920:
917:
915:
912:
910:
907:
905:
902:
900:
897:
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894:
890:
884:
881:
879:
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871:
869:
866:
864:
861:
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851:
847:
841:
838:
837:
835:
831:
825:
822:
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819:
815:
809:
805:
802:
801:
799:
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793:
787:
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781:
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773:
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749:
745:
741:
737:
733:
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721:
715:
712:
709:
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697:
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690:
689:
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685:
681:
675:
672:
671:
669:
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663:
660:
658:
654:
650:
643:
639:
635:
628:
623:
621:
616:
614:
609:
608:
605:
601:
590:
583:
582:
575:
568:
564:
561:
556:
548:
544:
543:
536:
534:
532:
527:
517:
514:
512:
509:
507:
506:MIDI timecode
504:
502:
499:
497:
494:
492:
489:
488:
487:
479:
475:
471:
464:
460:
456:
453:
448:
447:little-endian
444:
440:
439:
437:
434:
430:
426:
422:
421:color framing
418:
415:
411:
407:
406:
400:
396:
389:
386:
383:
372:
369:
350:
346:
343:
340:
337:
320:
317:
314:
295:
291:
288:
285:
282:
265:
262:
259:
240:
236:
233:
230:
227:
207:
204:
185:
178:
175:
172:
169:
155:
152:
149:
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137:
134:
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128:
125:
124:
112:
111:
99:
95:
93:
89:
84:
80:
76:
74:
70:
65:
63:
59:
55:
51:
44:
39:
33:
19:
1166:MPEG-2 Video
943:
704:Clear-Vision
599:
580:
574:
555:
541:
501:CTL timecode
485:
476:
472:
468:
462:
458:
419:Bit 15, the
398:
394:
187:Frame number
85:
81:
77:
66:
53:
49:
48:
1624:Templates (
1341:MPEG-H HEVC
1080:Progressive
1646:Categories
1468:Captioning
1270:MPEG-4 AVC
1038:Interlaced
963:Historical
899:Captioning
858:BTSC (MTS)
833:1250 lines
817:1125 lines
646:Television
522:References
410:drop frame
393:CRC bits (
182:User bits
121:User bits
43:VHS-Decode
1652:Timecodes
1605:Test card
1278:ATSC A/72
1184:DVB 3D-TV
796:819 lines
724:625 lines
684:525 lines
666:405 lines
459:including
416:standard.
118:Timecode
1517:Defunct.
1483:Teletext
1349:ATSC 3.0
1005:567-line
1000:455-line
995:441-line
990:375-line
985:343-line
980:180-line
970:Pre-1940
924:Teletext
804:System E
732:System B
692:System M
674:System A
563:Archived
482:See also
1364:ISDB-S3
1313:MobaHo!
1260:MobaHo!
1029:Digital
776:PALplus
354:(0–23)
299:(0–59)
297:Minutes
244:(0–59)
242:Seconds
1437:HE-AAC
1359:HD DMB
904:CGMS-A
840:HD-MAC
700:NTSC-J
657:Analog
1379:Audio
1331:ABS-S
1303:SBTVD
1242:ABS-S
1201:ABS-S
1144:UHDTV
1137:1080p
1068:1080i
868:NICAM
850:Audio
780:SECAM
772:PAL-N
714:B-MAC
708:PAL-M
585:(PDF)
425:SECAM
401:+ 1)
352:Hours
115:Sync
1473:CPCM
1427:LPCM
1397:AC-4
1387:AC-3
1369:DTMB
1323:AVS2
1308:1seg
1293:DTMB
1283:CMMB
1237:DTMB
1229:AVS+
1219:CMMB
1196:DTMB
1191:ISDB
1174:ATSC
1132:720p
1127:HDTV
1120:576p
1115:480p
1110:EDTV
1103:288p
1098:240p
1093:1seg
1088:LDTV
1063:HDTV
1056:576i
1051:480i
1046:SDTV
1015:OSKM
944:VITC
934:VEIL
863:EIAJ
824:MUSE
696:NTSC
414:NTSC
395:g(x)
54:VITC
18:VITC
1569:DCI
1478:EPG
1458:AFD
1432:AAC
1422:PCM
1407:DRA
1402:DTS
1391:5.1
1354:DVB
1298:DVB
1288:DMB
1211:AVS
1179:DVB
954:XDS
949:WSS
939:VIT
929:VBI
919:PDC
914:GCR
909:EPG
873:SAP
786:MAC
768:PAL
547:ITU
429:PAL
384:80
359:70
329:60
304:50
274:40
249:30
219:20
194:10
94:.)
1648::
1510:^
1498:^
1154:8K
1149:4K
806:,
778:,
774:,
770:,
762:,
758:,
754:,
750:,
746:,
742:,
738:,
734:,
706:,
702:,
698:,
587:.
545:.
530:^
397:=
390:0
379:F
373:20
370:10
365:0
347:8
335:0
324:F
321:40
318:20
315:10
310:0
292:8
280:0
269:F
266:40
263:20
260:10
255:0
237:8
225:0
214:C
208:20
205:10
200:0
179:8
167:0
161:0
45:)
1628:)
1571:)
1567:(
1393:)
1389:(
808:F
782:)
764:N
760:L
756:K
752:I
748:H
744:G
740:D
736:C
710:)
626:e
619:t
612:v
463:x
435:.
399:x
387:1
376:S
362:1
344:4
341:2
338:1
332:1
307:1
289:4
286:2
283:1
277:1
252:1
234:4
231:2
228:1
222:1
211:D
197:1
176:4
173:2
170:1
164:1
52:(
34:.
20:)
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