Grass Valley PROFILE FAMILY v.2.5 - Manual (Page 159)

Profile Family 159
Chapter
4
Using VdrPanel
Storing media on a Profile disk recorder rather than on tape opens the door to
almost instant access to digital video and audio material. Media is available to
all of Profile’s channels at once, so you can play a video and audio clip on more
than one channel at the same time. Since each of the channels is independent,
playback can start at a different time and place in a clip. One of the best features
of the Profile system is that you can start playing material while it’s still being
recorded.
The basic element of digitally stored video and audio is the clip. A clip is a
reference to video, audio, and timecode material recorded in media files on the
Profile media disks. A clip has a beginning and an end, and, when first recorded,
the beginning and end correspond to the first and last frames stored in the media
file, but a clip may refer to the entire media file or just part of it. When you
delete a clip, the media file that the clip refers to remains on disk if at least one
other clip refers to it—only the reference to the media file is deleted, not the
media itself.
You can mark in and out points in a clip. These marks change the effective
beginning and end points of a clip, while not removing the associated material
from the media file. On the other hand, you can trim media to remove material
from either end of a clip, which also removes the information from the media
file. Trimmed material is permanently removed from disk and is no longer
available for use.
The default tool for creating and playing clips on the Profile system is VdrPanel.
VdrPanel provides you with a VTR-like interface—complete with transport
controls—to directly manage media operations. Once created with VdrPanel,
clips are available for use with optional Profile applications, such as Tool Box
Editor or the List Manager.
VdrPanel allows you to configure any or all of your channels for operation
through a controller connected to an RS-422 serial port. These controllers either
comply with Profile Protocol, such as the optional PRC 100 Profile Remote
Control unit, or with Louth, Odetics, BVW, or BVW [insert edit] protocols.