COBHAM H264ENC Guia do Utilizador descarregar pdf (Página 91)

SOLH264TX Broadcast Transmitter

H264TX, H264ENGTX, H264ENC

UNCLASSIFIED

Part A - User Guide

DS000091

Rev 1.2 2013-05-02

UNCLASSIFIED

Page 10-81

progressive.

Sub vertical

resolution

Full, 1/2, 1/4

This is the fraction of the vertical resolution

for whatever format you have selected.

Let’s say you chose an HD 1080 format. This

is actually 1920 x 1080 where 1080 is the

vertical resolution.

If you choose Full then you’ll see all 1080

lines, if you choose 1/2 you’ll see a down-

sampled picture which requires much less bit-

rate to encoder.

Note: Using a sub-vertical resolution will

force the Encoding mode to progressive.

GOP Length

Default

Intra only

2 to 64 frames

GOP means Group of Pictures. The default

results in a GOP length equivalent to 1

second. (See Part-B Concept Guide, for an

explanation of GOP structures).

Shorter GOP, less delay, lower quality video,

more error resilience.

Longer GOP, more delay, higher quality

video, less error resilience.

Note: This option only affects Standard delay

Encoding modes.

DTS Delay (ms)

0

Decoding Time Stamp (DTS) is used to apply

an additional video decoding delay for 3

rd

party decoders which might require it. Audio

is also delayed by the same amount to

ensure synchronisation.

Manual

Video Bit Rate

(Mbit/s)

No Checkmark

Checkmark

Normally left in automatic. You can put a

checkmark in here and then the Video bit

rate box will become active. Now you can

manually set the video bit rate you want to

use.

Video sharpness

Normal, Sharp, or De-

blocking filter disabled

You can increase the sharpness of the video

but you will reduce the bandwidth.

De-blocking filter disabled applies to the

H.264 encoder only. This option is aimed at

reducing processor power needed when

using a PC based software decoder. Though

video quality will be reduced as a

consequence.

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