VBrick 9000 Admin Manual page 72

Field
Target Frame Rate
(frames/sec)
IDR Frame Interval
(sec)
Copy to Other
Rates
64
Description
The following options for Target Frame Rate vary depending on the
Video Format selected above. There are specific Frame Rates
associated with Standard Definition formats (NTSC or PAL) or with
High Definition formats (all others). The default is based on the
model: 60 (for single and dual channel models) or 30 (for quad
channel models).
• NTSC – 60, 30, 24, 15, 10, 7.5, 6, 5, 3, 2
• PAL – 50, 25, 12.5, 5, 2.5
Note: For Presenter Mode all of the above rates are allowed.
This number represents how many frames the encoder will send out
each second to carry the video to an H.264 player. The word target is
used because the encoder can vary its frame rate slightly in response
to the amount of motion in the movie or camera output. See the Rate
Control Setting parameter below for more details. Frame rate is the
number of "frames" the encoder sends in a second for an H.264
player to display. Moving pictures are made up of a rapid series of
"still" pictures that move so fast that the "illusion" of motion is
produced. A frame is one such "still" picture. Regular TV programs
in the U.S. run at about 30 frames in a second, and the more frames
presented in a second, the smoother the motion contained within the
video will appear. Encoding and transmitting a frame requires the use
of data, so that, when considering a particular bit rate, sending more
frames demands that each frame contain fewer fine details.
0–30. Default = 4. Also called "key frame interval." The frequency in
seconds at which IDR (Intra Dynamic Refresh) frames are inserted
for Seek, Fast Forward and Rewind functionality. Higher values
create fewer random access points and better compression efficiency.
Lower values create more access points but with less compression
efficiency. Zero means all frames are IDR frames. VBrick
recommends you do not set to zero because video quality is not
generally acceptable and stream bandwidth may be excessive.
Click this button to copy the "advanced rate settings" (IDR Frame
Interval, Rate Control Setting, Profile, and Entropy Coding) to all
other configured rates.
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