What is
GOP?
GOPEis an acronym that stands for Group of
Pictures.EIts origin lies in the way MPEG compression works. MPEG
data streams consist of one reference frame followed by a set of
difference frames. Because the difference frames only contain
information about what has changed from the previous reference
frame, they are much smaller, resulting in compression of the data
stream.
Because reference frames occur only
periodically in the data stream, editing at the GOP level can result
in some chunkiness. This is sufficient for making roughEcuts, for
example eliminating an entire unwanted sequence, but it is not
adequate for creating a smoothly transitioned video experience.
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What is Frame Editing?
To create precise cuts and smooth transitions,
it is necessary to move beyond GOP-level editing to frame-by-frame
granularity. In the case of MPEG data streams, this requires
decoding of the MPEG files GOPs into a sequence of uncompressed
frames, which are then edited by the user as desired, then
reencoding the frames into GOPs so that the advantages of MPEG
compression are regained.
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When I try to edit my MPEG videos with my current editor, I cannot
precisely splice scenes.
The MPEG editor that you are using either does
not support editing at frame-by-frame granularity, or does a poor
job of decoding GOPs into frames and/or reencoding the edited files
into GOPs for the final MPEG file format
output.
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Can I install VRF
Browser on my PC?
No, VRF Browser is a product for the Apple
Macintosh platform only. There are a number of software products
that support editing of MPEG files on PCs.
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Does the VRF Browser
require OSX?
VRF Browser can be installed on OS 9.1 and
9.2.2, as well as OSX, versions 2.6 through 3.2.
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What are
the system requirements for VRF Browser?
We recommend the following minimum system
system for VRF Browser:
|
Operating System |
Mac OS 9.1 to 9.2.2, Mac OS X 10.2.6 to
Mac OS X 10.4.3 |
|
CPU |
Power PC G3 500MHz or better |
|
Memory |
128MB RAM or more
(256MB or more recommended) |
|
Compatible Media |
DVD-RAM, DVD-R/-RW
A drive capable of reading DVD-RAM, DVD-R and DVD-RW discs is
required. Please follow the disc drive manufacturer's recommendation
for optimal operating environment.
If using and external DVD drive with Mac OS9, Pixela's PIX-DVRR series
or PIX-SLRR series is required. |
|
Compatible DVD Recorders |
DVD recorders and DVD video cameras that
record using
the "-VR" or "DVD-Video" formats. |
|
Compatible Drives: |
Drives that can read the "-VR" format or the "DVD-Video" -R/-RW
and -RAM formats. |
Read more about system requirements
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