111 lines
4.2 KiB
HTML
111 lines
4.2 KiB
HTML
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<p>
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Timecode settings are accessed from the menu in three places:
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</p>
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<ul>
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<li><kbd class="menu">Session > Properties > Timecode</kbd></li>
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<li><kbd class="menu">Edit > Preferences > Transport</kbd></li>
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<li><kbd class="menu">Edit > Preferences > MIDI</kbd></li>
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</ul>
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<h2>Timecode Settings</h2>
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<table class="dl">
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<tr><th><kbd class="menu">Timecode frames-per-second</kbd></th>
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<td>
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Configure timecode frames-per-second (23.976, 24, 24.975, 25, 29.97,
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29.97 drop, 30, 30 drop, 59.94, 60). Note that all fractional
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framerates are actually fps*(1000.0/1001.0).
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</td></tr>
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<tr><th><kbd class="menu">Pull up/down</kbd></th>
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<td>
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Video pull-up modes change the effective samplerate of Ardour to
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allow for changing a film soundtrack from one frame rate to another.
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See <a href="http://en.wikipedia.org/wiki/Telecine">Telecine</a>
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</td></tr>
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<tr><th><kbd class="menu">Slave Timecode offset</kbd></th>
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<td>
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The specified offset is added to the received timecode (MTC or
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LTC).
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</td></tr>
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<tr><th><kbd class="menu">Timecode Generator offset</kbd></th>
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<td>
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Specify an offset which is added to the generated timecode (so far only LTC).
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</td></tr>
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<tr><th><kbd class="option">JACK Time Master</kbd></th>
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<td>
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Provide Bar|Beat|Tick and other information to JACK.
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</td></tr>
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</table>
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<p>These settings are session specific.</p>
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<h2>Transport Preferences</h2>
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<table class="dl">
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<tr><th><kbd class="menu">External timecode source</kbd></th>
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<td>
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Select timecode source: JACK, LTC, MTC, MIDI Clock
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</td></tr>
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<tr><th><kbd class="option">Match session video frame rate to external timecode</kbd></th>
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<td>
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This option controls the value of the video frame rate <em>while
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chasing</em> an external timecode source. When enabled, the
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session video frame rate will be changed to match that of the selected
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external timecode source. When disabled, the session video frame rate
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will not be changed to match that of the selected external timecode
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source. Instead the frame rate indication in the main clock will flash
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red and Ardour will convert between the external timecode standard and
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the session standard.
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</td></tr>
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<tr><th><kbd class="option">External timecode is sync locked</kbd></th>
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<td>
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Indicates that the selected external timecode source shares sync (Black
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& Burst, Wordclock, etc) with the audio interface.
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</td></tr>
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<tr><th><kbd class="option">Lock to 29.9700 fps instead of 30000/1001</kbd></th>
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<td>
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The external timecode source is assumed to use 29.97 fps instead of
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30000/1001. SMPTE 12M-1999 specifies 29.97df as 30000/1001. The spec
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further mentions that drop-frame timecode has an accumulated error of -86ms
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over a 24-hour period. Drop-frame timecode would compensate exactly for a
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NTSC color frame rate of 30 * 0.9990 (ie 29.970000). That is not the actual
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rate. However, some vendors use that rate—despite it being against
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the specs—because the variant of using exactly 29.97 fps has zero
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timecode drift.
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</td></tr>
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<tr><th><kbd class="menu">LTC incoming port</kbd></th>
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<td>
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Offers a session agnostic way to retain the LTC port connection.
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</td></tr>
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<tr><th><kbd class="option">Enable LTC generator</kbd></th>
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<td>Does just what it says.</td></tr>
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<tr><th><kbd class="option">Send LTC while stopped</kbd></th>
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<td>
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Enable to continue to send LTC information even when the transport
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(playhead) is not moving. This mode is intended to drive analog tape
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machines which unspool the tape if no LTC timecode is received.
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</td></tr>
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<tr><th><kbd class="menu">LTC generator level</kbd></th>
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<td>
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Specify the Peak Volume of the generated LTC signal in dbFS. A good value
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is 0 dBu (which is -18 dbFS in an EBU calibrated system).
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</td></tr>
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</table>
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<p>
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These settings are common to all sessions.
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</p>
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<h2>MIDI Preferences</h2>
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<table class="dl">
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<tr><th><kbd class="option">Send MIDI Timecode</kbd></th><td>Enable MTC generator</td></tr>
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<tr><th><kbd class="option">Send MIDI Clock</kbd></th><td>Enable MIDI Clock generator</td></tr>
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</table>
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<p>
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These settings are also common to all sessions.
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</p>
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