Sync In CHOP
Note: Only available in TouchDesigner Pro.
The Sync In CHOP and Sync Out CHOP are used to keep timelines in two or more TouchDesigner processes within a single frame of each other. One process will contain a Sync Out CHOP while one or more other processes contain Sync In CHOPs. In addition any CHOP data sent through the Sync Out CHOP is received by the Sync In CHOPs. The CHOPs synchronize by pausing their own timeline until all Sync In/Out CHOPs have cooked. The Sync Out CHOP will be ahead of the Sync In CHOPs. If any CHOPs fail to communicate, the others will timeout, causing all processes to run slowly. The processes with Sync In CHOPs should have their Realtime flag checked off, as their frame rates will be determined by the Sync Out CHOP.
Client machines may come online at any point, or be switched off as desired, as the Sync Out CHOP will adjust accordingly, either timing out, temporarily or permanently banning individual clients as specified.
NOTE for Windows OS - If experiencing connection issues make sure Windows Firewall is disabled.
The columns are are:
- pid: process id of the client
- address: ip and port number
- machine_name: client machine name
- filename: name of the toe file the client resides in
- op_path: full operator path to the client
- include: when 1, the Sync Out CHOPs waits for a reply, when 0, it is ignored.
- timeout_total: The total number of times the Sync Out CHOP stalled waiting for this client
- timeout_consecutive: The running number of times the Sync Out CHOP stalled waiting for this client.
- steady_total: The total number of times the Sync Out CHOP received a reply in time.
- steady_consecutive: The running number of times the Sync Out CHOP received a reply in time:
- reply: The last reply from the client, all clients should have the same increasing value.
Similarly, an Info CHOP will reveal further information, such as:
- sync_incompletes: This number is constant when the system is in sync, and will climb up each time the number of clients responding does not match the expected number. When all is steady, the number does not change.
- sync_internal: The number of clients within the same toe file that it is waiting on.
- sync_external: The number of clients from different toe files that it is waiting on.
Whenever a client replies, it is immediately assumed reliable, and waited upon, by the Sync Out CHOP each frame thereafter.
When a client times-out a number of times in a row, however, it is continuously ignored by the Sync Out CHOP, until it replies on time again.
This also applies to clients that have stopped communicating altogether.
The number of consecutive timeouts is controlled by the
Client Timeouts (consecutive) parameter and is reflected by the
timeout_consecutive Info DAT column.
If a client produces unreliable communication, sometimes steady, sometimes timing out, then it can be permanently ignored by enabling
Ban Clients and setting the
Total Timeouts accordingly. Once a client timeouts a certain number of times, its Info DAT
include column reports
banned and it will always be ignored, even if it starts responding in time again.
Whenever the Sync Out CHOP first starts any and all clients are accepted, and nothing is banned. Pressing
Clear Stats in the Sync Out CHOP also returns to this state, clearing all banned lists, and totals, even in the remote client Info CHOPs.
See also Syncing Multiple Computers and Hardware Frame Lock.
Parameters - Sync In Page
active - Whether or not the CHOP is currently attempting to synchronize itself to a Sync Out CHOP.
multicastaddress - An IP address to communicate on (188.8.131.52).
port - The network port associated with the address.
timeout - The maximum amount of time the CHOP will wait for synchronization signals from the other Sync CHOPs. This value is expressed in milliseconds.
Parameters - Common Page
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 - 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.
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 has
autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).