Grass Valley PDR v.2.1 - Manual (Page 83)

Profile Family 67
Chapter
3
Using VdrPanel
Storing media on a Profile system rather than on tape opens the door to almost
instant access to video and audio material. Media is available to all of Profile’s
channels at once, so you can play a video on more than one channel at the same
time. Since each of the channels (up to four) 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
Profile 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. 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 referred to remains on disk—only the
reference to the media file is deleted, not the media itself.
You can also mark in and mark 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 removed from disk and is no longer available
for use.
The main 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 availble for use with optional Profile applications such as TimeDelay
or the List Manager in Profile Tool Box.
VdrPanel also 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 PRC100 Profile Remote
Control unit, or they comply with Louth, Odetics, BVW, or BVW [insert edit]
protocols.