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LiveEdge® Max GOP Structure

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This article specifies GOP structure for Videon's LiveEdge Max, LiveEdge Max 2, EZ Max, or EZ Max 2 products.

Quality/Latency

Quality/Latency setting controls how many B-frames there are per sub-GOP for H.264 (AVC) and H.265 (HEVC) video codecs. Normal is the recommended value.

A B-frame is a tradeoff of quality vs. latency. B-frames offer better compression, so you'll get better quality video for your bandwidth. B-frames also add a frame of latency per-B-frame. 2 B-frames per sub-GOP = 2 frames of added latency. Having no B-frames can allow you to decrease latency by a small amount.

For both H.264 (AVC) and H.265 (HEVC), when Quality/Latency are set to:

  • Normal = 1 B-frame per sub-GOP
  • Lowest = No B-frames 

B-frames are not supported with Constant Bitrate video profiles/encoders:

  • We recommend you only use "Lowest" Quality/Latency for Constant Bitrate video profiles/encoders.
  • “Normal” can be used, but you still will not see any B-frames present on the encoded content.

On LiveEdge® Max, B-frames are not strict and are “adaptive”, meaning you may not see consistent  GOPs of:

IBPBPBPBPBPBP

Sometimes, B-frames are skipped so you can see GOPs like:

IBPBPPPPPBPBP

Typically, the higher the bitrate, the more B-frames get skipped.

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