This page provides all the information related to Design Module 13 - VCU TRD Xilinx low latency(LLP2) PL DDR XV20 HDMI design.
Table of Contents
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1 Overview
This module enables capture of video from an HDMI-Rx subsystem implemented in the PL. The video can be displayed through the HDMI-Tx subsystem implemented in the PL. The module can stream-out and stream-in live captured video frames through an Ethernet interface at ultra-low latencies using Sync IP. This module supports multi-stream for XV20 pixel format. In this design PL_DDR is used for decoding and PS_DDR for encoding so that DDR bandwidth would be enough to support high bandwidth VCU applications requiring simultaneous encoder and decoder operations and transcoding at 4k @60 FPS.
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The below figure shows the Xilinx Low Latency PL DDR XV20 HDMI design software block diagram.
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1.1 Board Setup
Refer below link for Board Setup
1.2 Run Flow
The TRD package is released with the source code, Vivado project, Petalinux BSP, and SD card image that enables the user to run the demonstration. It also includes the binaries necessary to configure and boot the ZCU106 board. Prior to running the steps mentioned in this wiki page, download the TRD package and extract its contents to a directory referred to as TRD_HOME which is the home directory.
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rdf0428-zcu106-vcu-trd-2020.-1 ├── apu │ └── vcu_petalinux_bsp ├── images │ ├── vcu_10g │ ├── vcu_audio │ ├── vcu_hdmi_multistream_xv20 │ ├── vcu_hdmi_rx │ ├── vcu_hdmi_tx │ ├── vcu_llp2_hdmi_nv12 │ ├── vcu_llp2_hdmi_nv16 │ ├── vcu_llp2_hdmi_xv20 │ ├── vcu_llp2_sdi_xv20 │ ├── vcu_multistream_nv12 │ ├── vcu_pcie │ ├── vcu_sdirx │ ├── vcu_sditx │ └── vcu_sdi_xv20 ├── pcie_host_package │ ├── COPYING │ ├── include │ ├── libxdma │ ├── LICENSE │ ├── readme.txt │ ├── RELEASE │ ├── tests │ ├── tools │ └── xdma ├── pl │ ├── constrs │ ├── designs │ ├── prebuild │ ├── README.md │ └── srcs └── README.txt |
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rdf0428-zcu106-vcu-trd-2020.-1 ├── apu │ └── vcu_petalinux_bsp │ └── xilinx-vcu-zcu106-v2020.1-final.bsp ├── images │ ├── vcu_llp2_hdmi_xv20 │ │ ├── autostart.sh │ │ ├── BOOT.BIN │ │ ├── boot.scr │ │ ├── config │ │ ├── image.ub │ │ ├── system.dtb │ │ └── vcu ├── pcie_host_package ├── pl │ ├── constrs │ ├── designs │ │ ├── zcu106_llp2_xv20 │ ├── prebuild │ │ ├── zcu106_llp2_xv20 │ ├── README.md │ └── srcs │ ├── hdl │ └── ip └── README.txt |
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config ├── 1-4kp60 │ ├── Display │ └── Stream-out ├── 2-1080p60 │ ├── Display │ └── Stream-out ├── 2-4kp30 │ ├── Display │ └── Stream-out └── 4-1080p60 │ └── Stream-out └── input.cfg |
1.2.1 GStreamer Application (vcu_gst_app)
The vcu_gst_app is a command line multi-threaded linux application. The command line application requires an input configuration file (input.cfg) to be provided in the plain text.
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1.3 Build Flow
Refer below link for detailed build flow steps
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2 Other Information
2.1 Known Issues
For Petalinux related known issues please refer: PetaLinux 2020.1 - Product Update Release Notes and Known Issues
For VCU related known issues please refer AR# 66763: LogiCORE H.264/H.265 Video Codec Unit (VCU) - Release Notes and Known Issues and Xilinx Zynq UltraScale+ MPSoC Video Codec Unit.
Design has a negative slack of WNS around -50 ps . However it does not affect the functionality of the design in the long run also and will be fixed in next release.
2.2 Limitations
For Petalinux related limitations please refer: PetaLinux 2020.1 - Product Update Release Notes and Known Issues
For VCU related limitations please refer AR# 66763: LogiCORE H.264/H.265 Video Codec Unit (VCU) - Release Notes and Known Issues , Xilinx Zynq UltraScale+ MPSoC Video Codec Unit and PG252.
2.3 Optimum VCU Encoder parameters for use-cases
Video streaming:
Video streaming use-case requires very stable bitrate graph for all pictures.
It is good to avoid periodic large Intra pictures during the encoding session
Low-latency rate control (hardware RC) is the preferred control-rate for video streaming, it tries to maintain equal amount frame sizes for all pictures.
Good to avoid periodic Intra frames instead use low-delay-p (IPPPPP…)
VBR is not a preferred mode of streaming.
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Enable profile=high and use qp-mode=auto for low-bitrate encoding use-cases.
The high profile enables 8x8 transform which results in better video quality at low bitrates.
2.4 Max Bit-rate Benchmarking
The following tables summarize the maximum bit rate achievable for 3840x2610p60 resolution, XV20 pixel format at GStreamer level. The maximum supported target bit rate values vary based on what elements and type of input used in the pipeline.
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Refer LLP1/LLP2 serial pipelines from the Appendix-B for Max bitrate measurement.
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3 Appendix A - Input Configuration File (input.cfg)
The example configuration files are stored at /media/card/config/ folder.
Common Configuration:
It is the starting point of common configuration.
Num of Input:
1, 2, 3, 4
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Preset:
Options: Custom
Exit
It indicates to the application that the configuration is over.
Streaming Configuration:
It is the starting point of streaming configuration.
Streaming Num:
Starting Nth Streaming configuration.
Options: 1, 2, 3, 4
Host IP:
The host to send the packets to
Options: 192.168.25.89 or Windows PC IP
Port:
The port to send the packets to
Options: 5004, 5008, 5012 and 5016
Exit
It indicates to the application that the configuration is over.
Trace Configuration:
It is the starting point of trace configuration.
FPS Info:
To display fps info on the console.
Options: True, False
APM Info:
To display APM counter number on the console.
Options: True, False
Pipeline Info:
To display pipeline info on console.
Options: True, False
Exit
It indicates to the application that the configuration is over.
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4 Appendix B - HDMI-Rx/Tx Link-up and GStreamer Commands
This section covers configuration of HDMI-Rx using media-ctl utility and HDMI-Tx using modetest utility, along with demonstrating HDMI-Rx/Tx link-up issues and steps to switch HDMI-Rx resolution. It also contains sample GStreamer Low-Latency XV20 and Xilinx’s Ultra Low-Latency XV20 Video pipelines for Display, Stream-In and Stream-Out use-cases.
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