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7. Streaming Control (2)- GOP and Intra Modes
ANT-4000E supports two modes of sending the I frame:
# I and P frames sent separately. This is referred to as GOP mode (Group Of Pictures).
An I frame or reference frame is generated followed by a number of P frames
(Predictive) determined by the GOP SIZE setting (e.g GOP=60 is 1x I frame followed
by 60 P frames)
# RandIntraCoded and ContIntraCoded are similar methods of “Slice” encoding where
the I frame data is broken into pieces and sent together with the P frames. A traditional
I frame is generated when a new client joins in or at the start of a transmission.
# Contiguous Intra Coded (ContIntraCoded) is where the top left macroblock of an I
frame is sent with the first P frame. The next Macroblock of the I frame is sent with
second P frame and so on . Last macroblock is bottom right.
# Random Intra Coded (RandIntraCoded) is where macroblocks of the I frame are
randomly selected and sent embedded in P frames.
# Intra Count defines the period over which I frames are dispersed over P frames, simply
number of P frames to each I frame.
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Coding Method
selection
Intra Coding P frame
count/I frame