Table of Contents

1 Overview

The primary goal of this Design is to demonstrate the capabilities of VCU hard block present in Zynq UltraScale+ EV devices. The TRD will serve as a platform to tune the performance parameters of VCU and arrive at optimal configurations for encoder and decoder blocks with the streaming use case where bandwidth plays a vital role. 10G will give sufficient bandwidth for the streaming protocol to play video pipeline smoothly.

This design supports the following video interfaces:

Sources:

Sinks:

VCU Codec:

Streaming Interfaces:

Video format:


10G Deliverables:

Pipeline

Input source

Output Type

Resolution

Video encode/Decoder type

Deliverables

Record/Stream-Out pipeline

HDMI-Rx

File Sink/ Stream-Out

4K/1080p

HEVC/AVC

HDMI Rx Video encodes with VCU and stores it in a container format.

Playback pipeline

File Source/ Stream-In

HDMI –Tx

4K/1080p

HEVC/AVC

Playback of the local-file/stream-in with video decoded using VCU and display on  HDMI-Tx.

Capture--> Display

HDMI-Rx

HDMI -Tx

4K/1080p

HEVC/AVC

HDMI Rx Video passes to HDMI-Tx without VCU.

Capture--> Encode--> Decode--> Display

HDMI-Rx

HDMI -Tx

4K/1080p

HEVC/AVC

HDMI Rx raw video passes through  VCU elements encoder and decoder and finally displays on HDMI-Tx.


Supported Resolution:

The table below provides the supported resolution in this design.

Resolution
Command Line
Single StreamMulti-stream
4kp60NA
4kp30NA
1080p60NA


√ - Supported
NA – Not applicable
x – Not supported


The below figure shows the TRD block diagram.

The below sections describe the 10G HDMI Video Capture and HDMI Display design. It is VCU TRD design supporting 10G HDMI-Rx and HDMI-Tx. For the overview, software tools, system requirements and design files follow the link below:

The below figure shows the 10G HDMI Video Capture and HDMI Display design hardware block diagram.

The below figure shows the 10G HDMI Video Capture and HDMI Display design software block diagram.

1.1 Board Setup

Refer below link for Board Setup

       Board Connections: 


The figure shows the ZCU106 board connections for 10G HDMI-Rx and HDMI-Tx Streaming support

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.

Refer below link to download all TRD contents.

TRD package contents are placed in the following directory structure. The user needs to copy all the files from the $TRD_HOME/images/vcu_10g/ to FAT32 formatted SD card directory.

└── rdf0428-zcu106-vcu-trd-2019-2
	├── 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
	│   ├── etc
	│   ├── include
	│   ├── libxdma
	│   ├── LICENSE
	│   ├── README.md
	│   ├── tools
	│   └── xdma
	├── pl
	│   ├── constrs
	│   ├── designs
	│   ├── prebuild
	│   ├── README.md
	│   └── srcs
	└── README.txt


TRD package contents specific to 10G HDMI Video Capture and HDMI Display design is placed in the following directory structure.

rdf0428-zcu106-vcu-trd-2019-2
├── apu
│   └── vcu_petalinux_bsp
│       └── xilinx-vcu-zcu106-v2019.2-final.bsp
├── images
│   ├── vcu_10g
│   │   ├── autostart.sh
│   │   ├── bin
│   │   ├── BOOT.BIN
│   │   ├── config
│   │   ├── image.ub
│   │   ├── system.dtb
│   │   └── vcu
├── pcie_host_package
├── pl
│   ├── constrs
│   ├── designs
│   │   ├── zcu106_10g
│   ├── prebuild
│   │   ├── zcu106_10g
│   ├── README.md
│   └── srcs
│       ├── hdl
│       └── ip
└── README.txt


configuration files(input.cfg) for various Resolutions are placed in the following directory structure in /media/card.

config/
├── 4kp60
│   ├── Display
│   ├── Record
│   ├── Stream-out
│   └── Stream-in
├── 4kp30
│   ├── Display 
│   ├── Record 
│   ├── Stream-out
│   └── Stream-in 
├── 1080p60 
│   ├── Display 
│   ├── Record 
│   ├── Stream-out
│   └── Stream-in 
└── 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 plain text.

Execution of the application is shown below:

% vcu_gst_app < path to *.cfg file>


Example:

4kp60 HEVC_HIGH Display Pipeline execution

% vcu_gst_app /media/card/config/4kp60/Display/Single_4kp60_HEVC_HIGH.cfg

4kp60 HEVC_HIGH Record Pipeline execution

% vcu_gst_app /media/card/config/4kp60/Record/Single_4kp60_HEVC_HIGH.cfg

4kp60 HEVC_HIGH Stream-out Pipeline execution

% vcu_gst_app /media/card/config/4kp60/Stream-out/Single_4kp60_HEVC_HIGH.cfg

4kp60 HEVC_HIGH Stream-in Pipeline execution

% vcu_gst_app /media/card/config/4kp60/Stream-in/input.cfg

NOTE: Make sure HDMI-Rx should be configured to 4kp60 mode.

To measure the latency of the pipeline, run the below command. The latency data is huge, so dump it to a file.

% GST_DEBUG="GST_TRACER:7" GST_TRACERS="latency;scheduletime" ./vcu_gst_app ./input.cfg >& dump_log.txt


Refer below link for detailed run flow steps


1.3 Build Flow

Refer below link for Build Flow



2 Other Information

2.1 Known Issues

2.2 Limitations

2.3 Optimum VCU Encoder parameters for use-cases:

Video streaming:

Performance: AVC Encoder settings:

Quality: Low bitrate AVC encoding:



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:
Provide the number of inputs. this is always 1 for this design.

Output:
Select the video interface.
Options: HDMI or DP

Out Type:
Options: display, record, and stream

Display Rate:
Pipeline frame rate.
Options: 30 FPS or 60 FPS for each stream.

Exit:
It indicates to the application that the configuration is over.

Input Configuration:
It is the starting point of the input configuration.

Input Num:
Starting Nth input configuration.
Options: 1

Input Type:
Input source type.
Options: HDMI, File, Stream

Uri:
File path or Network URL. Applicable for file playback and stream-in pipeline only. Supported file formats for playback are ts, mp4, and mkv.
NOTE: For 10G HDMI Options: file:///media/usb/abc.ts (for file path), udp://192.168.26.89:5004/ (for Network streaming, Here 192.168.26.89 is 10G IP address and 5004 is port no) 
            For 1G HDMI Options: file:///media/usb/abc.ts (for file path), udp://192.168.25.89:5004/ (for Network streaming, Here 192.168.25.89 is the 1G IP address and 5004 is port no) 

Raw:
To tell the pipeline is processed or pass-through.
Options: True, False

Width:
The width of the live source.
Options: 3840, 1920

Height:
The height of the live source.
Options: 2160, 1080

Exit:
It indicates to the application that the configuration is over.

Encoder Configuration:
It is the starting point of encoder configuration.

Encoder Num:
Starting Nth encoder configuration.
Options: 1

Encoder Name:
Name of the encoder.
Options: AVC, HEVC

Profile:
Name of the profile.
Options: baseline, main or high for AVC. Main for HEVC.

Rate Control:
Rate control options.
Options: CBR, VBR, and low-latency.

Filler Data:
Filler Data NAL units for CBR rate control.
Options: True, False

QP:
QP control mode used by the VCU encoder.
Options: Uniform, Auto

L2 Cache:
Enable or Disable L2Cache buffer in encoding process.
Options: True, False

Latency Mode:
Encoder latency mode.
Options: normal, sub_frame

Low Bandwidth:
If enabled, decrease the vertical search range used for P-frame motion estimation to reduce the bandwidth.
Options: True, False

Gop Mode:
Group of Pictures mode.
Options: Basic, low_delay_p, low_delay_b

Bitrate:
Target bitrate in Kbps
Options: 1-60000

B Frames:
Number of B-frames between two consecutive P-frames
Options: 0-4

Slice:
The number of slices produced for each frame. Each slice contains one or more complete macroblock/CTU row(s). Slices are distributed over the frame as regularly as possible. If slice-size is defined as well more slices may be produced to fit the slice-size requirement.
Options:
4-22 4kp resolution with HEVC codec
4-32 4kp resolution with AVC codec
4-32 1080p resolution with HEVC codec
4-32 1080p resolution with AVC codec

GoP Length:
The distance between two consecutive I frames
Options: 1-1000

Format:
The format of input data.
Options: NV12

Preset:
Options: HEVC_HIGH, HEVC_MEDIUM, HEVC_LOW, AVC_HIGH, AVC_MEDIUM, AVC_LOW, Custom

Exit
It indicates to the application that the configuration is over.

Record Configuration:
It is the starting point of record configuration.

Record Num:
Starting Nth record configuration.
Options: 1

Out-File Name:
Record file path.
Options: /media/usb/abc.ts

Duration:
Duration in minutes.
Options: 1-3

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.

Host IP:
The host to send the packets to
Note: For 10G- Options: 192.168.26.89 or Windows PC IP 
Note: For 1G- 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 the 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.


4 Appendix B

$ xmedia-ctl -p -d /dev/media0

When HDMI source is connected to 4KP60 resolution, it shows:

root@zcu106_vcu_trd:/media/card# xmedia-ctl -p -d /dev/media0
Media controller API version 4.19.0

Media device information
------------------------
driver          xilinx-video
model           Xilinx Video Composite Device
serial          
bus info        
hw revision     0x0
driver version  4.19.0

Device topology
- entity 1: vcap_hdmi output 0 (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video0 -----> Video node for HDMI Rx source
        pad0: Sink
                <- "a0080000.v_proc_ss":1 [ENABLED]

- entity 5: a0080000.v_proc_ss (2 pads, 2 links)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
        pad0: Sink
                [fmt:VYYUYY8_1X24/3840x2160 field:none]
                <- "a0000000.v_hdmi_rx_ss":0 [ENABLED]
        pad1: Source
                [fmt:VYYUYY8_1X24/3840x2160 field:none]
                -> "vcap_hdmi output 0":0 [ENABLED]

- entity 8: a0000000.v_hdmi_rx_ss (1 pad, 1 link)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev1
        pad0: Source
                [fmt:VYYUYY8_1X24/3840x2160 field:none colorspace:rec709]
                [dv.caps:BT.656/1120 min:0x0@25000000 max:4096x2160@297000000 stds:CEA-861,DMT,CVT,GTF caps:progressive,reduced-blanking,custo]
                [dv.detect:BT.656/1120 3840x2160p60 (4400x2250) stds:CEA-861 flags:CE-video] -----> Resolution and Frame-rate of HDMI Rx source 
                -> "a0080000.v_proc_ss":0 [ENABLED]

NOTE: Check resolution and frame-rate of "dv.detect" under "v_hdmi_rx_ss" node.

When the HDMI source is not connected, it shows:

root@zcu106_vcu_trd:/media/card# xmedia-ctl -p -d /dev/media0
Media controller API version 4.19.0

Media device information
------------------------
driver          xilinx-video
model           Xilinx Video Composite Device
serial          
bus info        
hw revision     0x0
driver version  4.19.0

Device topology
- entity 1: vcap_hdmi output 0 (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video0 -----> Video node for HDMI Rx source
        pad0: Sink
                <- "a0080000.v_proc_ss":1 [ENABLED]

- entity 5: a0080000.v_proc_ss (2 pads, 2 links)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
        pad0: Sink
                [fmt:VYYUYY8_1X24/3840x2160 field:none]
                <- "a0000000.v_hdmi_rx_ss":0 [ENABLED]
        pad1: Source
                [fmt:VYYUYY8_1X24/3840x2160 field:none]
                -> "vcap_hdmi output 0":0 [ENABLED]

- entity 8: a0000000.v_hdmi_rx_ss (1 pad, 1 link)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev1
        pad0: Source
                [fmt:VYYUYY8_1X24/3840x2160 field:none colorspace:rec709]
                [dv.caps:BT.656/1120 min:0x0@25000000 max:4096x2160@297000000 stds:CEA-861,DMT,CVT,GTF caps:progressive,reduced-blanking,custo]
                [dv.query:no-link] -----> HDMI Rx Link Status
                -> "a0080000.v_proc_ss":0 [ENABLED]

NOTE: Here "dv.query:no-link" under "v_hdmi_rx_ss" node shows HDMI-Rx source is not connected or HDMI-Rx source is not active(Try waking up the device by pressing the key on remote).


Notes for gst-launch-1.0 commands:

When HDMI Input Source is NVIDIA SHIELD

$ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":0  [fmt:RBG888_1X24/3840x2160 field:none]"
$ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":1  [fmt:VYYUYY8_1X24/3840x2160 field:none]"

NOTE: Make sure NVIDIA SHIELD is configured for 4kp resolution and RGB888 color format.

When HDMI Input Source is ABOX

$ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":0  [fmt:VYYUYY8_1X24/3840x2160 field:none]"
$ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":1  [fmt:VYYUYY8_1X24/3840x2160 field:none]"

NOTE: Make sure ABOX is configured for 4kp resolution and VYYUYY8 color format.


$ vcu_gst_app /media/card/config/input.cfg

Below configurations needs to be set in input.cfg for HDMI-1080p60.

Common Configuration    : START
Num Of Input            : 1
Output                  : HDMI
Out Type                : Display
Frame Rate              : 60
Exit

Input Configuration     : START
Input Num               : 1
Input Type              : hdmi
Raw                     : TRUE
Width                   : 1920
Height                  : 1080
Exit
$ modetest -D a0070000.v_mix -s 40:3840x2160-60@BG24 -w 36:"alpha":0 
$ gst-launch-1.0 v4l2src device=/dev/video0 io-mode=4 ! video/x-raw, width=3840, height=2160, format=NV12, framerate=60/1 ! queue ! kmssink bus-id="a0070000.v_mix"
$ gst-launch-1.0 v4l2src device=/dev/video0 io-mode=4 ! video/x-raw, width=3840, height=2160, format=NV12, framerate=60/1 ! omxh265enc qp-mode=auto gop-mode=basic gop-length=60 b-frames=0 target-bitrate=60000 num-slices=8 control-rate=constant prefetch-buffer=true low-bandwidth=false filler-data=true cpb-size=1000 initial-delay=500 ! video/x-h265, profile=main, alignment=au ! h265parse ! omxh265dec internal-entropy-buffers=5 low-latency=0 ! queue max-size-bytes=0 ! fpsdisplaysink text-overlay=false video-sink="kmssink bus-id="a0070000.v_mix" sync=true" sync=true
$ gst-launch-1.0 v4l2src device=/dev/video0 io-mode=4 ! video/x-raw, format=NV12,width=3840,height=2160,framerate=60/1 ! omxh265enc qp-mode=auto gop-mode=basic gop-length=60 b-frames=0 target-bitrate=60000 num-slices=8 control-rate=constant prefetch-buffer=true low-bandwidth=false filler-data=true cpb-size=1000 initial-delay=500 ! video/x-h265, profile=main, alignment=au ! h265parse ! queue ! mpegtsmux alignment=7 name=mux ! filesink location="/run/test.ts"

NOTE: File location should be USB-3.0 to avoid the read-write bandwidth issue.

$ gst-launch-1.0 uridecodebin uri="file:///run/test.ts" ! queue max-size-bytes=0 ! fpsdisplaysink text-overlay=false video-sink="kmssink bus-id="a0070000.v_mix""

NOTE: File location should be USB-3.0 to avoid the read-write bandwidth issue.

$ gst-launch-1.0 v4l2src device=/dev/video0 io-mode=4 ! video/x-raw, format=NV12, width=3840, height=2160, framerate=60/1 ! omxh265enc qp-mode=auto gop-mode=basic gop-length=60 b-frames=0 target-bitrate=60000 num-slices=8 control-rate=constant prefetch-buffer=true low-bandwidth=false filler-data=true cpb-size=1000 initial-delay=500 periodicity-idr=60 ! video/x-h265, profile=main-422-10, alignment=au ! h265parse ! queue ! mpegtsmux alignment=7 name=mux ! rtpmp2tpay ! udpsink host=192.168.25.89 port=5004

NOTE: Here 192.168.25.89 is host/client IP address and 5004 is port no.

$ gst-launch-1.0 udpsrc port=5004 buffer-size=60000000 caps="application/x-rtp, clock-rate=90000" ! rtpjitterbuffer latency=1000 ! rtpmp2tdepay ! tsparse ! video/mpegts ! tsdemux name=demux ! queue ! h265parse ! omxh265dec internal-entropy-buffers=5 low-latency=0 ! queue max-size-bytes=0 ! fpsdisplaysink text-overlay=false video-sink="kmssink bus-id="a00c0000.v_mix" " sync=true

Note: Low latency stream pipeline cannot be launched with vcu-gst-app. Hence use below gst-launch pipelines.

$ gst-launch-1.0 v4l2src device=/dev/videoX io-mode=4 ! video/x-raw, format=NV12, width=3840, height=2160, framerate=60/1 ! omxh265enc qp-mode=auto gop-mode=basic gop-length=60 b-frames=0 target-bitrate=60000 num-slices=8 control-rate=low-latency prefetch-buffer=true low-bandwidth=false filler-data=true cpb-size=1000 initial-delay=500 periodicity-idr=60 ! video/x-h265, profile=main, alignment=nal ! queue ! mpegtsmux alignment=7 name=mux ! rtpmp2tpay ! udpsink host=192.168.26.89 port=5004

NOTE:Here 192.168.26.89 is host/client IP address and 5004 is port no.

$ gst-launch-1.0 udpsrc port=5004 buffer-size=60000000 caps="application/x-rtp, clock-rate=90000" ! rtpjitterbuffer latency=1000 ! rtpmp2tdepay ! tsparse ! video/mpegts ! tsdemux name=demux ! queue ! h265parse ! video/x-h265, profile=main, alignment=nal ! omxh265dec internal-entropy-buffers=5 low-latency=1 ! queue max-size-bytes=0 ! kmssink bus-id="a0070000.v_mix"