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MGW Ace Encoder HEVC Encoding and Streaming Appliance

User Manual, Version 2.1 36

• Tier: Main / High

• Aspect Ratio – The proportional relationship between the video width and its height. For

auto configuration “Same as Input” shall be set.

• GOP Structure – Specifies the GOP structure used by the encoder. The encoder

supports:

• Intra Frame encoding

• IP: IP encoding is recommended for applications sensitive to latency. Alternatively, IB

structure below could be used.

• IB: It is recommended to use IB structure instead of IP if the decoder is compatible

with such mode. The efficiency of B frames is higher than P frames leading to a better

compression ratio while keeping a low latency.

• IBBBP: This structure is recommended to ensure the best video quality / compression

ratio at the cost of higher latency.

• I(7B)P equivalent to IBBBBBBBP: This structure is recommended to ensure pristine

video quality / compression ratio at the cost of twice more latency than IBBBP

structure.

• GOP Size – The intervals between I-Frames. Range is 1-300. A default and optimal value

is calculated based on the profile selected and the encoding frame rate.

• Fixed GOP Size – If enabled, it ensures GOP structure is not modified during the

encoding process. Fixed GOP Size might be necessary for compatibility with sensitive

decoder. When enabled, it impacts negatively the compression efficiency.

• Closed GOP – The I-Frame does not contain information from previous GOPs. Select the

box to close each GOP with an I-Frame. When enabled, it impacts negatively the

compression efficiency.

• Timestamps – Enable to insert Timecode information within the video stream. If VITC is

available within the SDI input, it is used as default Timecode value. If not present or

another video input is used, time of the system is inserted.

If KLV is used, the precision timestamp from KLV metadata is also inserted in the Video

Elementary stream.

• Latency Monitoring – Enable to allow end-to-end latency monitoring when decoding the

stream with MGW Ace Decoder. Latency can be monitored within MGW Ace Decoder web

interface or via HTTP command.

If enabled, Timecode input is not captured from SDI input anymore.

• To ensure accurate Latency Monitoring, system date must be synchronized to an NTP server. Ensure to

correctly configure the NTP server in System/Date and Time section on both MGW Ace Encoder and MGW Ace

Decoder.

• When Latency Monitoring is enabled, SDI timecode (VITC) is no more embedded.

• Insert AU Delimiters - Select the box to enable Access Unit Delimiter in the NAL

(Network Abstraction Layer) unit of the HEVC frames.

Vitec Multimedia MGW Ace User Manual

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