MOTU V4HD User Manual page 38

Capture
The V4HD is in Capture mode when it is connected
to the computer and video software has actively
taken control of the V4HD hardware for the
purposes of capturing video and audio from the
V4HD via the FireWire connection. Here are some
examples of when video software would put the
V4HD into Capture mode:
You open the Log and Capture window in Final
■
Cut Pro. Or you use any Final Cut Pro feature, such
as Edit to Tape, that involves capturing or
previewing the live video input from the V4HD.
You run the MOTU Video Setup software and
■
click the Preview tab (Figure 6-1 on page 41,
Figure 6-26 on page 52). This causes MOTU Video
Setup to "take over" the FireWire video signal
being supplied by the V4HD and display it in the
preview window.
In capture mode, only one software application has
access to the V4HD at a time. For example, when
the Video Setup is the active application and the
Preview tab is selected, Final Cut Pro will not see
the V4HD hardware at all. To give control to Final
Cut Pro, simply switch to Final Cut Pro. For further
information, see "Preview" on page 52.
Mode
Capture
Convert
Playback / Playback only
Audio only
Standalone video
Standalone audio
Figure 5-2: Summary of V4HD modes.
38
Description
FireWire video capture, with all outputs active.
All outputs active, no FireWire capture.
Inputs disabled, playback from Final Cut Pro.
Video I/O is disabled. V4HD operates as a
FireWire audio interface.
V4HD is disconnected from the computer and
operates as a standalone video converter and audio
mixer.
V4HD is disconnected from the computer and
operates as a standalone audio mixer only.
Even though the primary purpose of Capture
mode is to feed video to the computer via FireWire,
the V4HD continues to simultaneously convert the
source video signal and send it to all video outputs
as well. This allows you to simultaneously monitor
what you are capturing using any combination of
the V4HD's video outputs. You could even dub the
source signal to a video deck or other video
recorder during capture.
Convert
Convert mode is almost identical to Capture mode
(above), except that the V4HD does not feed video
to FireWire and the computer. However, the
currently selected video source is still fed to all
other V4HD video outputs. Convert mode serves
as a "default" mode for the V4HD, when none of the
other modes are currently engaged.
Playback / Playback only
The V4HD goes into Playback mode when an
application is sending video to it. For example,
Final Cut Pro puts the V4HD into playback mode
when All Frames or Single Frames is selected in the
External Video sub-menu or when using Print to
Video. Otherwise, the V4HD reverts to Convert
mode, or Capture mode when you go into the Log
and Capture window.
Video Video
Inputs Outputs
active active
Yes Yes
Yes Yes
No Yes
No No
Yes Yes
No No
FireWire
capture Clock source
Yes Video source
No Video source
No V4HD video
clock
Audio Audio clock
only source (page 73)
No Video source
No Audio clock
source (page 73)
V 4 H D B A S I C S