Eusso UNC7825 Series, Руководство пользователя, Страница: 41 / 127

– Advanced A/V Settings
z
Interlacing
There are 2 modes available: Interlaced or Progressive.
Interlaced mode is a storage mode. An interlaced video stream contains fields rather than frames, with each field
containing half of the lines of a frame.
A progressive video stream consists of only full frames.
Interlaced video streams can bring a lower bitrate but may cause lower quality.
z TV Standard : The TV standard can be set among these 3 formats NTSC, PAL and SECAM.
z Sequence Mode
There are 2 different modes available:
♦
I-frames only
♦
I-frames and P-frames
P-frames, or predictive frames, are predicted based on prior P or I-frames plus some additional data. They have a
much higher compression ratio than I-frames.
I-frame only mode has very little compression resulting in large file sizes.
I-frame and P-frame mode offers relatively good compression with medium file sizes. Although this requires more
work on the host PC to decode the video.
z GOP Size: GOP stands for Group Of Pictures. It defines the number of frames from one I-frame to the next. Since
an I-frame uses very little compression, while P/B frames use much higher compression, a larger GOP size
results in smaller file sizes.
z Peak Bitrate: This is used to set a maximum bitrate that can be achieved. This is useful for setting bitrates
between the values that are available from the Video Encoder bitrate list.
z Apply: Click this button to save the changes made.
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