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<title>Vertical interval timecode</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Vertical interval timecode</span></span>

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</style><div role="note" class="hatnote navigation-not-searchable">"VITC" redirects here. For the South African music Festival often referred to as "Vodacom In The City", see <a href="In_the_City_(South_African_festival)" title="In the City (South African festival)">In the City (South African festival)</a>.</div>

<p><b>Vertical Interval Timecode</b> (<b>VITC</b>, pronounced "vitsee") is a form of <a href="SMPTE_timecode" title="SMPTE timecode">SMPTE timecode</a> encoded on one scan line in a video signal. These lines are typically inserted into the <a href="Vertical_blanking_interval" title="Vertical blanking interval">vertical blanking interval</a> of the video signal.

</p><p>With one exception, VITC contains the same payload as SMPTE <a href="Linear_timecode" title="Linear timecode">linear timecode</a> (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 <a href="Interlaced_video" title="Interlaced video">interlaced video</a> frame, once in each field, and one additional bit (the "field flag") is used to distinguish the two fields.

</p><p>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.

</p><p>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 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.

</p><p>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 <a href="Non-return-to-zero" title="Non-return-to-zero">non-return-to-zero</a> encoding at a bit rate of 115 times the line rate. (The unused 25 bit times are to leave room for the <a href="Horizontal_blanking_interval" title="Horizontal blanking interval">horizontal blanking interval</a>.)

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<caption>SMPTE vertical interval timecode<br>(compliant with SMPTE 12M)<sup id="cite_ref-BR.780-2_1-0" class="reference"><a href="#cite_note-BR.780-2-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

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<th>

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<th colspan="2">Sync

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<th colspan="4">Timecode

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<th colspan="4">User bits

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<th> Bit 

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<th> 0 

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<th> 1 

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<th> 2 

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<th> 3 

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<th> 4 

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<th> 5 

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<th> 6 

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<th> 7 

</th>

<th> 8 

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<th> 9 

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<th rowspan="2">0

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<td rowspan="2" bgcolor="#ccffff">0

</td>

<td>8

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<td rowspan="16" colspan="4" bgcolor="#ccffcc">User bits

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<td rowspan="2" colspan="4" bgcolor="#ffffcc">Frame number<br>(0–23, 24, or 29)

</td></tr>

<th rowspan="2">10

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<td rowspan="2">0

</td></tr>

<td bgcolor="#ffcccc">C

</td></tr>

<th rowspan="2">20

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<td rowspan="2" bgcolor="#ccffff">0

</td>

<td>8

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<td rowspan="2" colspan="4" bgcolor="#ffffcc">Seconds<br>(0–59)

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<th rowspan="2">30

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<td rowspan="2">0

</td></tr>

<td bgcolor="#ffcccc">F

</td></tr>

<th rowspan="2">40

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<td rowspan="2" bgcolor="#ccffff">0

</td>

<td>8

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<tr>

<td rowspan="2" colspan="4" bgcolor="#ffffcc">Minutes<br>(0–59)

</td></tr>

<th rowspan="2">50

</th>

<td rowspan="2">0

</td></tr>

<td bgcolor="#ffcccc">F

</td></tr>

<th rowspan="2">60

</th>

<td rowspan="2" bgcolor="#ccffff">0

</td>

<td>8

</td></tr>

<tr>

<td rowspan="2" colspan="4" bgcolor="#ffffcc">Hours<br>(0–23)

</td></tr>

<th rowspan="2">70

</th>

<td rowspan="2">0

</td></tr>

<td bgcolor="#ffcccc">F

</td></tr>

<th>80

</th>

<td>0

</td>

<td colspan="8" bgcolor="#ffccff">CRC bits (<i>g(x)</i> = <i>x</i><sup>8</sup> + 1)

</td></tr></tbody></table>

<ul><li>Bit 14 is set to 1 if <a href="SMPTE_time_code" class="mw-redirect" title="SMPTE time code">drop frame</a> 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 <a href="NTSC" title="NTSC">NTSC</a> standard.</li>

<li>Bit 15, the <a href="Color_framing" title="Color framing">color framing</a> bit, is set to 1 if the time code is synchronized to a (color) video signal. The frame number modulo 2 (for NTSC and <a href="SECAM" title="SECAM">SECAM</a>) or modulo 4 (for <a href="PAL" title="PAL">PAL</a>) should be preserved across cuts in order to avoid phase jumps in the <a href="Chrominance_subcarrier" title="Chrominance subcarrier">chrominance subcarrier</a>.</li>

<li>Bits 35, 55, and 75 differ between 25 frame/s time code, and 30/29.97 frame/s.<sup id="cite_ref-BR.780-2_1-1" class="reference"><a href="#cite_note-BR.780-2-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page: 20">: 20 </span></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The bits are:

<ul><li>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 "polarity correction" bit in linear timecode.</li>

<li>"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 <a href="Little-endian" class="mw-redirect" title="Little-endian">little-endian</a>). The combinations with BGF2 set are reserved.<sup id="cite_ref-BR.780-2_1-2" class="reference"><a href="#cite_note-BR.780-2-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page: 7–8">: 7–8 </span></sup></li></ul></li>

<li>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.</li>

<li>The checksum in bits 82–89 is a simple bytewise XOR of the previous 82 bits (<i>including</i> the sync bits, so bit 82 is the XOR of bits 74, 66, ..., 2), which can be described as a CRC with generator polynomial <i>x</i><sup>8</sup>+1. (Preset to zero, no inversion.)</li></ul>

<p>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.

</p><p>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 dominance would result in color artifacts on the part of the signal that was not in sync with the output color frame sequence.

</p><p>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 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.

</p>

<p>Related technologies and standards

</p>

<ul><li><a href="Linear_timecode" title="Linear timecode">Linear timecode</a></li>

<li><a href="Burnt-in_timecode" title="Burnt-in timecode">Burnt-in timecode</a></li>

<li><a href="CTL_timecode" class="mw-redirect" title="CTL timecode">CTL timecode</a></li>

<li><a href="MIDI_timecode" title="MIDI timecode">MIDI timecode</a></li>

<li><a href="AES-EBU_embedded_timecode" class="mw-redirect" title="AES-EBU embedded timecode">AES-EBU embedded timecode</a></li>

<li><a href="Rewritable_consumer_timecode" title="Rewritable consumer timecode">Rewritable consumer timecode</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation cs1"><a rel="nofollow" class="external text" href="https://www.itu.int/rec/R-REC-BR.780-2-200504-I/en"><i>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</i></a>. <a href="ITU" class="mw-redirect" title="ITU">ITU</a>. 2005-04-08 [1992, 2002].</cite></span>

</li>

<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.poynton.com/notes/video/Timecode/Table.html">Timecode bit assignment table</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110105091857/http://www.poynton.com/notes/video/Timecode/Table.html">Archived</a> January 5, 2011, at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a>, Charles Poynton</span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite class="citation cs1"><a rel="nofollow" class="external text" href="https://law.resource.org/pub/in/bis/S04/is.12429.2.1988.pdf"><i>Indian Standard IS: 12429 (Part 2) Time and Control Code for Video Tape Recorders: Part 2 Vertical-Interval Time Code (VITC)</i></a> <span class="cs1-format">(PDF)</span>. <a href="Bureau_of_Indian_Standards" title="Bureau of Indian Standards">Bureau of Indian Standards</a>. 2002 [1988]. pp. <span class="nowrap">2–</span>5.</cite> This is an example of the 25 frame/s bit assignments, which are different from the more commonly seen 30/29.97 bit assignments.</span>

</li>

</ol></div></div>

<p><br>

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</style><div id="Broadcast_video_formats33" style="font-size:114%;margin:0 4em"><a href="Video" title="Video">Broadcast video formats</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible uncollapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Television33" style="font-size:114%;margin:0 4em">Television</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Analog_television" title="Analog television">Analog</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:5em"><a href="405-line_television_system" title="405-line television system">405 lines</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="CCIR_System_A" title="CCIR System A">System A</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="525_lines" title="525 lines">525 lines</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="CCIR_System_M" title="CCIR System M">System M</a> (Color systems: <a href="NTSC" title="NTSC">NTSC</a>, <a href="NTSC-J" title="NTSC-J">NTSC-J</a>, <a href="Clear-Vision" title="Clear-Vision">Clear-Vision</a>, <a href="PAL-M" title="PAL-M">PAL-M</a>)</li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="625_lines" title="625 lines">625 lines</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="CCIR_System_B" title="CCIR System B">System B</a>, <a href="CCIR_System_C" title="CCIR System C">C</a>, <a href="CCIR_System_D" title="CCIR System D">D</a>, <a href="CCIR_System_G" title="CCIR System G">G</a>, <a href="CCIR_System_H" title="CCIR System H">H</a>, <a href="CCIR_System_I" title="CCIR System I">I</a>, <a href="CCIR_System_K" title="CCIR System K">K</a>, <a href="CCIR_System_L" title="CCIR System L">L</a>, <a href="CCIR_System_N" title="CCIR System N">N</a> (Color systems: <a href="PAL" title="PAL">PAL</a>, <a href="PAL#PAL-N" title="PAL">PAL-N</a>, <a href="PALplus" title="PALplus">PALplus</a>, <a href="SECAM" title="SECAM">SECAM</a>)</li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="819_line" title="819 line">819 lines</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="CCIR_System_E" title="CCIR System E">System E</a>, <a href="CCIR_System_F" title="CCIR System F">F</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">1125 lines</th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">1250 lines</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Audio_signal" title="Audio signal">Audio</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<li><a href="NICAM" title="NICAM">NICAM</a></li>

<li><a href="Sound-in-Syncs" title="Sound-in-Syncs">Sound-in-Syncs</a></li>

<li><a href="Zweikanalton" title="Zweikanalton">Zweikanalton (A2/IGR)</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Hidden signals</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Closed_captioning" title="Closed captioning">Captioning</a></li>

<li><a href="Teletext" title="Teletext">Teletext</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em">Historical</th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Mechanical_television" title="Mechanical television">Mechanical television</a></li>

<li><a href="Field-sequential_color_system" title="Field-sequential color system">Field-sequential color system</a></li>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Digital_television" title="Digital television">Digital</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Interlaced_video" title="Interlaced video">Interlaced</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Progressive_scan" title="Progressive scan">Progressive</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<li><a href="Ultra-high-definition_television" title="Ultra-high-definition television">UHDTV</a>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="H.262/MPEG-2_Part_2" title="H.262/MPEG-2 Part 2">MPEG-2 Video</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Audio_Video_Standard#First_generation" title="Audio Video Standard">AVS</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Audio_Video_Standard#First_generation" title="Audio Video Standard">AVS+</a><sup id="cite_ref-avs_4-0" class="reference"><a href="#cite_note-avs-4"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="MPEG-4_Part_2" title="MPEG-4 Part 2">MPEG-4 Visual</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<ul><li><a href="MobaHo!" title="MobaHo!">MobaHo!</a><sup id="cite_ref-mobaho_5-0" class="reference"><a href="#cite_note-mobaho-5"><span class="cite-bracket">[</span>note 2<span class="cite-bracket">]</span></a></sup></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Advanced_Video_Coding" title="Advanced Video Coding">MPEG-4 AVC</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

<li><a href="ISDB-T_International" title="ISDB-T International">SBTVD</a></li>

<li><a href="MobaHo!" title="MobaHo!">MobaHo!</a><sup id="cite_ref-mobaho_5-1" class="reference"><a href="#cite_note-mobaho-5"><span class="cite-bracket">[</span>note 2<span class="cite-bracket">]</span></a></sup></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Audio_Video_Standard#Second_generation" title="Audio Video Standard">AVS2</a><sup id="cite_ref-avs_4-1" class="reference"><a href="#cite_note-avs-4"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="High_Efficiency_Video_Coding" title="High Efficiency Video Coding">MPEG-H HEVC</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:5em"><a href="Surround_sound" title="Surround sound">Audio</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">

<li><a href="MPEG-1_Audio_Layer_II" title="MPEG-1 Audio Layer II">MPEG-1 Audio Layer II</a></li>

<li><a href="MPEG_Multichannel" title="MPEG Multichannel">MPEG Multichannel</a></li>

<li><a href="MPEG-H_3D_Audio" title="MPEG-H 3D Audio">MPEG-H 3D Audio</a></li></ul>

<li><a href="Broadcast_flag" title="Broadcast flag">Broadcast flag</a></li>

<li><a href="Closed_captioning" title="Closed captioning">Captioning</a></li>

<li><a href="Teletext" title="Teletext">Teletext</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="text-align: left;"><div><div class="reflist">

<li id="cite_note-avs-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-avs_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-avs_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">Also used in China's DVB-S/S2 network.</span>

</li>

<li id="cite_note-mobaho-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-mobaho_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-mobaho_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">Defunct.</span>

</li>

</ol></div></div></div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Technical_issues33" style="font-size:114%;margin:0 4em">Technical issues</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="14%3A9_aspect_ratio" title="14:9 aspect ratio">14:9 compromise</a></li>

<li><a href="Broadcast-safe" title="Broadcast-safe">Broadcast-safe</a></li>

<li><a href="Digital_cinema" title="Digital cinema">Digital cinema</a> (<a href="Digital_Cinema_Initiative" class="mw-redirect" title="Digital Cinema Initiative">DCI</a>)</li>

<li><a href="Display_motion_blur" title="Display motion blur">Display motion blur</a></li>

<li><a href="MPEG_transport_stream" title="MPEG transport stream">MPEG transport stream</a></li>

<li><a href="Reverse_Standards_Conversion" title="Reverse Standards Conversion">Reverse Standards Conversion</a></li>

<li><a href="Television_standards_conversion" title="Television standards conversion">Standards conversion</a></li>

<li><a href="Television_transmitter" title="Television transmitter">Television transmitter</a></li>

<li><a href="Video_on_demand" title="Video on demand">Video on demand</a></li>

<li><a href="Video_processing" title="Video processing">Video processing</a></li>

<li><a href="Widescreen_signaling" title="Widescreen signaling">Widescreen signaling</a></li>

<li>Templates (Analogue TV Topics)</li></ul>

</div></td></tr></tbody></table><div></div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-07-11" href="https://en.wikipedia.org/wiki/?title=Vertical_interval_timecode&oldid=1300024773">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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