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- genlock - genlock capability on IRIS-4D Series machines
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- Genlock is the synchronizing of two video outputs, such that the
- horizontal and vertical sync signals are aligned. For genlock to be
- possible, the two video outputs must be running the same video format.
- All IRIS-4D Series graphics systems have some genlock capability.
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- A graphics pipe normally has on it a clock source, such as a crystal,
- that is used to generate internal timings. To genlock a graphics pipe,
- you must supply a suitable external clock; you must then inform the
- software that it is to use the supplied clock instead of its internal
- default.
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- Genlock is controlled by the _s_e_t_m_o_n(_1_G) command and the _s_e_t_m_o_n_i_t_o_r(_3_G)
- IrisGL function call. To enable or disable genlock, you must use one of
- these. For a full description of the various parameters available please
- consult those man pages.
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- When genlocking two IRIS-4D Series machines together, you should
- designate one system as the `master' and the other as the `slave'. The
- master system will run normally and use its internal crystal to generate
- its sync signal. The slave system will take the sync signal from the
- first system and use it; the call to _s_e_t_m_o_n(_1_G) or _s_e_t_m_o_n_i_t_o_r(_3_G) should
- only be done on the slave system. To route the sync signal would
- typically require a coaxial cable from the `Sync Output' jack of the
- master system to the `Genlock Input' jack of the slave system. Also, this
- signal should usually be terminated at the destination end with a 75-ohm
- resistor.
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- If more than two graphics systems are to be locked together, you must
- still designate one system as the `master'; all other systems are
- `slaves'. Care must be taken in this setup to correctly route the sync
- from the master to all of the slaves; this should normally be done in
- daisy-chain fashion. Note that this connection must be terminated only
- once, at the last slave in the chain.
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- In some multi-screen stereo applications it is desirable to genlock
- stereo screens together. Care must be taken to ensure that right-eye
- views are locked together. For some older stereo formats, this may
- require several attemps; the system may lock the left eye of one screen
- to the right eye of the other. If this occurs, turn genlock off and try
- the genlock again.
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- Removing and reconnecting the sync signal from the sync input is not
- suggested, as this may cause problems with the hardware. Genlock should
- always be turned off via _s_e_t_m_o_n(_1_G) or _s_e_t_m_o_n_i_t_o_r(_3_G) before connecting
- or disconnecting the sync signal.
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- In a IRIS-4D system with multiple graphics pipelines, these pipelines are
- not automatically genlocked; they run completely independantly, exactly
- as if they were in different systems. If it is desired to run the
- graphics pipes genlocked together, this must be done by the user as
- described above.
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- In general, the input sync reference signal must be identical to the
- output sync signal for that format; in other words, you can generally
- only lock together identical video formats.
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- setmon(1G), setmonitor(3G)
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