AMX NMX-ENC-1100 Instruction Manual page 35

Encoding Options (Cont.)
Video Bitrate (kbps)
Video Profile
Gop Size
Video Burst Size
Video Codec
Frame Decimation
Audio Source
Audio Sampling Rate
Audio Codec
Audio Bitrate (kbps)
Instruction Manual - NMX-ENC H.264 Encoder
Enter the target video bit rate for the encoded video. Higher bit rates will result
in higher quality encoded video. Enter the bit rate in kilobytes per second
(kbps). Press ENTER or click Save to submit the value to the encoder. The
default setting is 6000. For a list of recommended bit rates for output
resolution, see the Recommended Bit Rates for Output Resolutions section on
page 46.
Note: Higher bit rates can cause network congestion resulting in video issues.
Select the encoding profile. The profile defines the subset of H.264 encoding
techniques that will be used during the encode process. Not all decoders
support all profiles; therefore, it is important to select a profile that is supported
by all playback devices for a given application. You can choose from Baseline,
Main, or High. The default setting is High.
• The Baseline profile uses only a limited subset of encoding techniques,
requiring less processing power to decode, making it well suited for use with
mobile devices.
• The Main profile uses most of the encoding techniques, which requires
more processing power to decode, making it well suited for use with set top
boxes.
• The High profile uses almost all of the encoding techniques. It is designed
for HD encoding and works well with HD set top boxes and software
decoders.
Select from the menu the Group of Pictures (GOP) size. GOP size determines
the distance between two full image frames (I-frames) in the encoded video.
Larger GOP sizes result in greater compression efficiency, but it takes longer
for the video to recover from errors. You can choose from 15, 30, 60, 120, or
240 frames. The default setting is 60.
The video burst size specifies a duration in which a collection of frames can be
sent at a given moment. The value you can select is in milliseconds. You can
select from several values between 150ms and 2000ms. The default setting is
300ms.
Shows the video codec the encoder is using. This field is view-only.
Frame decimation reduces the number of input frames to increase the quality
of the video image. When you select a value, you are selecting a value which
indicates the fraction by which you want to reduce the input bit rate. You can
choose from None, 1/2, 1/3, or 1/4. The default setting is None.
Select from the menu the type of audio source you want to encode. You can
choose from Digital Audio, Analog Audio, or No Audio. Digital Audio is only
available if you select HDMI or SDI from the Video Format menu. Selecting
Analog Audio activates the Audio Sampling Rate option.
Shows the audio sampling rate the encoder is using. This field is only available
if you set the audio source to Analog Audio and is view-only.
Shows the audio codec the encoder is using. This field is view-only.
Enter the target video bit rate for the encoded audio. Higher bit rates will result
in higher quality encoded audio.The options are in kilobytes per second (kbps).
You can choose from 64, 96, 128, or 192 kbits. The default setting is 128 kbits.
Web Configuration
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