MOTU V4HD User Manual page 47

The V4HD's HDMI/DVI output can send either
the SD or HD video signal. Use the "HDMI Output
Source" setting (page 51) in the Output tab to
specify either SD or HD. If you choose HD, the
HDMI/DVI block in the signal path diagram
connects to the HD signal path, as shown in
Figure 6-3. If you choose SD, it connects to the SD
signal path, as shown in Figure 6-25.
FireWire
Your host software running on the computer is
represented by the block labeled with the FireWire
icon (Figure 6-3). Notice that this block can be fed
by either the HD or the SD signal path, depending
on the Preview Format setting (Figure 6-26 on
page 52). This block is not present in the Playback
Signal Path diagram (Figure 6-2), since the V4HD
does not feed a signal to the computer in this mode.
The pull-down menu
Pull-down is a process used to convert 23.976 fps
film footage to 29.97 interlaced video. Reverse pull-
down, or pull-down removal, can be used to
restore the original film frame rate. These
processes involve the addition or removal of
interlaced video fields. For a complete explanation,
refer to the Final Cut Pro User Manual.
If the V4HD video source is running at 23.976 or 24
fps, and it is being sent to an output at a different
frame rate (29.97, 30, 59.94 or 60), the signal path
diagram displays a pull-down menu (Figure 6-17)
that lets you choose which cadence of pull-down
will be inserted: either 2:3 or 2:3:3:2 pull-down.
Figure 6-17: Pull-down menu.
M O T U V I D E O S E T U P
Pull-down insertion is supported in the following
cases:
Converting any 23.976 fps HD signal to
■
480i29.97 (This can be done in any mode: capture,
convert, or playback.)
Playing back 480p23.976, converting to
■
480i29.97 and 23.976 fps HD (720p23.976,
1080p23.976 or 1080PsF 23.976)
Playing back 1080p23.976, converting to
■
1080i29.97 and 480i29.97
Playing back 720p23.976, converting to
■
720p59.94 and 480i29.97
Playing back 1080p24, converting to 1080i30
■
(SD is disabled in this case.)
Playing back 720p24, converting to 720p60 (SD
■
is disabled in this case.)
Pull-down detection and removal
The V4HD automatically detects and removes
pull-down in the following conversion situations:
Convert 480i29.97 to 23.976 fps HD (720 or
■
1080)
Convert 480i29.97 to 23.976 fps HD (720 or
■
1080) and capture as 480p23.976
If pull-down is detected in the source signal, and
the "Detect Pull-down" option (page 55) is
selected, the V4HD displays the cadence in the
signal path display as shown in Figure 6-18:
Figure 6-18: Pull-down detection.
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