AR# 71993

2018.3 Zynq UltraScale+ MPSoC VCU - Why do I see a bitrate of 1.55 Mbps when using CBR Rate Control Mode with a Target Bit Rate of 1 Mbps, and a GOP Length of 12?

Description

Why do I see a bitrate of 1.55Mbps when using CBR Rate Control Mode with a Target Bit Rate of 1 Mbps, and a GOP Length of 12?

For example, control-rate=2, target-bitrate=1000 and gop-length=12.

Solution

This is a known issue with the Zynq UltraScale+ MPSoC - LogiCORE H.264/H.265 Video Codec Unit (VCU) when using CBR Rate Control Mode with a Target Bit Rate of 1 Mbps, and a GOP Length of 12.

See the following solutions for each PetaLinux version:

  • 2018.2 - Users can download the PetaLinux Recipes and Patch files from (Xilinx Answer 71798) to work around this issue.
  • 2018.3 - Users can download the PetaLinux Recipes and Patch files from (Xilinx Answer 71798) to work around this issue.
  • 2019.1 - These patches are included in the 2019.1 release and later versions.

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AR# 71993
Date 02/06/2019
Status Active
Type General Article
Devices
Tools
IP