PLANET ICA-HM620 - Manual (Page 80)

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Users can set the GOV length to determine the frame structure (I-frames and P-frames) in a video
stream for saving bandwidth. Longer GOV means decreasing the frequency of I-frames. Click <Save>
to confirm the GOV setting.
H.264 Profile
Users can set each H.264 Profile to <Baseline Profile>, <Main Profile> or <High Profile> according to
its compression needs. With the same bit rate, the higher the compression ratio, the better the image
quality is. The default setting is <Main Profile>.
NOTE: Please make sure the higher compression ratio is supported by
system before setup.