LTC In CHOP
Summary[edit]
The LTC In CHOP reads SMPTE timecode data encoded into an audio signal. Read the overview Linear Timecode.
First bring the audio signal into CHOPs using an Audio Device In CHOP. This can then be input into the LTC In CHOP.
See also: LTC Out CHOP
Parameters - LTC Page
Input Frame Rate inputrate - This specifies the number of complete frame messages per second the signal encodes. It is usually between 24 and 30.
Discrete Channels discrete - When enabled, adds frame, second, minute, and hour channels will be added to the output.
Total LTC Frames totalframes - When enabled, adds a channel to the output that reports total elapsed LTC frames at the current time. This value will change if up-sampling to the timeline FPS.
Total Seconds totalsec - When enabled, adds a channel to the output that reports total elapsed seconds.
Up-sample to Timeline FPS upsample - Resamples up to the project's FPS.
User Fields userfields - This enables channels for custom user fields which may be encoded in the audio signal.
Debug Channels debugchans - This enables the following debug channels.
- quantized - Outputs the raw signal quantized to on and off levels.
- bits - Outputs the above quantized signal into decoded bits. (Note: Bits are decoded from specific edge sequences, not the raw levels themselves).
- ones_count - Outputs the total number of consecutive decoded one bits. (Note, 12 consecutive ones denotes an end of message).
- decode_count - Outputs the total number of successful decoded frame messages.
Parameters - Common Page
Time Slice timeslice - Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.
Scope scope - To determine which channels get affected, some CHOPs use a Scope string on the Common page.
Sample Rate Match srselect - ⊞ - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.
- Resample At First Input's Rate
first- Use rate of first input to resample others.
- Resample At Maximum Rate
max- Resample to the highest sample rate.
- Resample At Minimum Rate
min- Resample to the lowest sample rate.
- Error If Rates Differ
err- Doesn't accept conflicting sample rates.
Export Method exportmethod - ⊞ - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.
- DAT Table by Index
datindex- Uses the docked DAT table and references the channel via the index of the channel in the CHOP.
- DAT Table by Name
datname- Uses the docked DAT table and references the channel via the name of the channel in the CHOP.
- Channel Name is Path:Parameter
autoname- The channel is the full destination of where to export to, such hasgeo1/transform1:tx.
Export Root autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
Export Table exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).
Operator Inputs
- Input 0 -
TouchDesigner Build:
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An Operator Family which operate on Channels (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.
The frame rate that TouchDesigner's Timeline uses. Equal to the Frames per Second value project.cookRate.
The frame rate that TouchDesigner's Timeline uses. Equal to the Frames per Second value project.cookRate.
The panel at the bottom of TouchDesigner, it controls the current Time of the full system or just one component.
A Time Slice is the time from the last cook frame to the current cook frame. In CHOPs it is the set of short channels that only contain the CHOP channels' samples between the last and the current cook frame.
A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator.
samples-per-second of a CHOP. Each CHOP in your network has a sample rate, whether it is used or not. The overall timeline has a "frame rate", which is the number of animation frames per second, generally your monitor display frequency.
Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.
An Operator Family that manipulates text strings: multi-line text or tables. Multi-line text is often a command Script, but can be any multi-line text. Tables are rows and columns of cells, each containing a text string.
Parameters in TouchDesigner are an operator's settings (numbers, menus, flags, strings, paths) which the user can alter. Parameters for any operator can be opened by right-clicking on the operator and selecting "Parameters..." A currently selected operator's parameters can be viewed in a Network Editor by pressing the keyboard shortcut 'p'.
TouchDesigner is a hierarchy of components. "root" is the top-most network in the hierarchy. The Path is simply /. A typical path is /project1/moviein1.
