Avid Technology Car Video System PT Manuel D’Utilisation
Chapter 3: Basic Media Station|PT Workflows
45
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You can also change the following options:
Display Both Fields
When combined with the
Full Quality setting in the Video Quality icon
(see “Changing Video Quality” on page 44), this
setting provides full-resolution output to the
DVI port.
(see “Changing Video Quality” on page 44), this
setting provides full-resolution output to the
DVI port.
Flip On Vertical Sync
If you notice that your
video output is “tearing” (horizontal distortion
on rapidly moving or heavily edited sequences),
select this option.
on rapidly moving or heavily edited sequences),
select this option.
.
Expand Luminance for Computer Displays
If you
are outputting full screen playback to a standard
computer monitor, select this option for a more
accurate video image. If you are outputting full
screen playback to a professional quality moni-
tor through Component, DVI, or HDMI out-
puts, you may want to deselect this option.
computer monitor, select this option for a more
accurate video image. If you are outputting full
screen playback to a professional quality moni-
tor through Component, DVI, or HDMI out-
puts, you may want to deselect this option.
6
Click OK to save your changes and close the
dialog.
Video Frame Rate vs. Monitor
Refresh Rate
Refresh Rate
When you play back video on a monitor with a
refresh rate that differs from the video frame
rate (as is often the case during playback of
video through a DVI output), the output yields
visual artifacts and offsets in synchronization
between audio and video. For example, this oc-
curs during playback of a 24 fps video clip on a
DVI monitor with a refresh rate of 75 Hz.
refresh rate that differs from the video frame
rate (as is often the case during playback of
video through a DVI output), the output yields
visual artifacts and offsets in synchronization
between audio and video. For example, this oc-
curs during playback of a 24 fps video clip on a
DVI monitor with a refresh rate of 75 Hz.
If your workflow requires high-quality playback,
you must output video through an Avid video
peripheral to an NTSC or PAL monitor.
you must output video through an Avid video
peripheral to an NTSC or PAL monitor.
The artifact and audio/video sync issues occur as
follows:
follows:
Frame “Tearing” & Video “Stutter”
Frame “tear-
ing” is the horizontal distortion on rapidly mov-
ing or heavily edited sequences. Video “stutter”
is the subtle shifting of video during playback.
ing or heavily edited sequences. Video “stutter”
is the subtle shifting of video during playback.
You can remedy one of these issues at a time
(but not simultaneously) using the Flip On Ver-
tical Sync option, located in the Full Screen Play-
back Settings dialog.
(but not simultaneously) using the Flip On Ver-
tical Sync option, located in the Full Screen Play-
back Settings dialog.
Audio/Video Synchronization Offset
Audio/video
synchronization varies slightly with each frame.
Though usually not noticeable to the eye, more
precise measuring devices cause offsets in AV
sync of up to 1/2 frame or more. This is normal
whenever using the output of a computer's
monitor card, and does not affect capture, edit-
ing, or layback.
Though usually not noticeable to the eye, more
precise measuring devices cause offsets in AV
sync of up to 1/2 frame or more. This is normal
whenever using the output of a computer's
monitor card, and does not affect capture, edit-
ing, or layback.
Capturing Audio and Video
Media Station|PT lets you capture video and au-
dio by:
dio by:
• Manually capturing audio and video
• Re-digitizing an existing sequence
• Digitizing from an edit decision list (EDL)
Manually Capturing Audio and
Video
Video
Before capturing audio and video from tape, en-
sure that you have made the following connec-
tions:
sure that you have made the following connec-
tions:
Changing these settings may cause sync is-
sues or cause the video output to stutter.
sues or cause the video output to stutter.
For more information, see “Changing Video
Output Settings for Full-Screen Playback”
on page 44.
Output Settings for Full-Screen Playback”
on page 44.