Zynq UltraScale+ MPSoC VCU TRD 2020.1 - Xilinx Low Latency PS DDR NV12 HDMI Audio Video Capture and Display

This page provides all the information related to Design Module 11 - VCU TRD Xilinx low latency(LLP2) PL DDR NV12 HDMI design.

Table of Contents

1 Overview

This module enables capture of video and audio data from an HDMI-Rx subsystem implemented in the PL. The video and audio data can be displayed through the HDMI-Tx subsystem implemented in the PL. The module can stream-out and stream-in live captured video and audio through an Ethernet interface at ultra-low latencies using Sync IP. This module supports multi-stream video for NV12 pixel format. This module also supports single-stream audio.

The VCU encoder and decoder operate in slice mode. An input frame is divided into multiple slices (8 or 16) horizontally. The encoder generates a slice_done interrupt at every end of the slice. Generated NAL unit data can be passed to a downstream element immediately without waiting for the frame_done interrupt. The VCU decoder also starts processing data as soon as one slice of data is ready in its circular buffer instead of waiting for complete frame data. The Sync IP does an AXI transaction-level tracking so that the producer and consumer can be synchronized at the granularity of AXI transactions instead of granularity at the video buffer level. Sync IP is responsible for synchronizing buffers between Capture DMA and VCU encoder as both work on same buffer.

The capture element (FB write DMA) writes video buffers in raster-scan order. SyncIP monitors the buffer level while the capture element is writing into DRAM and allows the encoder to read input buffer data if the requested data is already written by DMA, otherwise it blocks the encoder until DMA completes its writes. On the decoder side, the VCU decoder writes decoded video buffer data into DRAM in block-raster scan order and displays reads data in raster-scan order. To avoid display under-run problems, software ensures a phase difference of "~frame_period/2", so that decoder is ahead compare to display.

This design supports the following video interfaces:

Sources:

  • HDMI-Rx capture pipeline implemented in the PS.

  • Stream-In from network or internet.

Sinks:

  • HDMI-Tx display pipeline implemented in the PS.

VCU Codec:

  • Video Encode/Decode capability using VCU hard block in PS

    • AVC/HEVC encoding

    • Encoder/decoder parameter configuration.

Video format:

  • NV12

Supported Resolution:

The table below provides the supported resolution from command line app only in this design.

Resolution

Command Line

Single Stream

Multi-stream

4kp60

NA

4kp30

√ (Max 2)

1080p60

√ (Max 4 for encoder) (Max 2 for decoder)

√ - Supported
NA – Not applicable
x – Not supported

When using Low Latency mode (LLP1/LLP2), The encoder and decoder are limited by the number of internal cores. The encoder has maximum of four streams and the decoder has maximum of two streams.

The below table gives information about the features supported in this design. 

Pipeline

Video Input
source

Audio Input
source

Video Format

Video Output
Type

Audio Output
Type

Resolution

VCU codec

Pipeline

Video Input
source

Audio Input
source

Video Format

Video Output
Type

Audio Output
Type

Resolution

VCU codec

Serial pipeline

HDMI-Rx

HDMI-Rx

NV12

HDMI-Tx

HDMI-Tx

4kp60/4kp30/1080p60

HEVC/AVC

Stream-Out pipeline

HDMI-Rx

HDMI-Rx

NV12

Stream-Out

Stream-Out

4kp60/4kp30/1080p60

HEVC/AVC

Stream-in pipeline

Stream-In

Stream-In

NV12

HDMI-Tx

HDMI-Tx

4kp60/4kp30/1080p60

HEVC/AVC

The below figure shows the Xilinx Low Latency PS DDR NV12 HDMI design hardware block diagram.

The below figure shows the Xilinx Low Latency PS DDR NV12 HDMI design software block diagram.

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.

TRD package contents are placed in the following directory structure. The user needs to copy all the files from the $TRD_HOME/images/vcu_llp2_hdmi_nv12/ to FAT32 formatted SD card directory.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 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

TRD package contents specific to Xilinx Low Latency PS DDR NV12 HDMI design are placed in the following directory structure.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 rdf0428-zcu106-vcu-trd-2020-1 ├── apu │ └── vcu_petalinux_bsp │ └── xilinx-vcu-zcu106-v2020.1-final.bsp ├── images │ ├── vcu_llp2_hdmi_nv12 │ │ ├── autostart.sh │ │ ├── BOOT.BIN │ │ ├── boot.scr │ │ ├── config │ │ ├── image.ub │ │ ├── system.dtb │ │ └── vcu ├── pcie_host_package ├── pl │ ├── constrs │ ├── designs │ │ ├── zcu106_llp2_audio_nv12 │ ├── prebuild │ │ ├── zcu106_llp2_audio_nv12 │ ├── README.md │ └── srcs │ ├── hdl │ └── ip └── README.txt

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

The single streams configs (1-1080p60, 1-4kp30 and 1-4kp60) supports Audio and Video both.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 config ├── 1-1080p60 │   ├── Display │   └── Stream-out ├── 1-4kp30 │   ├── Display │   └── Stream-out ├── 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.

Run below modetest command to set CRTC configurations for 4kp60:

1 $ modetest -D a0070000.v_mix -s 38:3840x2160-60@BG24

Run below modetest command to set CRTC configurations for 4kp30:

1 $ modetest -D a0070000.v_mix -s 38:3840x2160-30@BG24

Execution of the application is shown below:

1 $ vcu_gst_app /media/card/config/< path to *.cfg file>

Example:

  • Make sure HDMI-Rx should be configured to 4kp60 mode, while running below example pipelines.

  • Low latency(LLP1/LLP2) video and audio+video stream-in pipelines are not supported in vcu_gst_app.

  • The vcu_gst_app uses RTP+RTCP streaming and opus encoder for LLP1/LLP2 audio+video stream-out use-cases.

  • All single-stream serial/streaming pipelines have audio configuration ON by default. To execute only display pipeline, change the Audio Enable property to FALSE in the configuration file.

4kp60 NV12 HEVC_25Mbps ultra low-latency(LLP2) audio+video serial pipeline execution.

1 $ vcu_gst_app /media/card/config/1-4kp60/Display/Single_4kp60_HEVC_25_Mbps.cfg

4kp60 NV12 HEVC_25Mbps ultra low-latency(LLP2) stream-out pipeline execution.

1 $ vcu_gst_app /media/card/config/1-4kp60/Stream-out/Single_4kp60_HEVC_25_Mbps.cfg

4kp60 NV12 HEVC ultra low-latency(LLP2) video stream-in pipeline execution.

1 $ gst-launch-1.0 udpsrc port=5004 buffer-size=60000000 caps="application/x-rtp, media=video, clock-rate=90000, payload=96, encoding-name=H265" ! rtpjitterbuffer latency=7 ! rtph265depay ! h265parse ! video/x-h265, alignment=nal ! omxh265dec low-latency=1 ! video/x-raw\(memory:XLNXLL\) ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false video-sink="kmssink bus-id=a0070000.v_mix" sync=true -v

4kp60 NV12 HEVC ultra low-latency(LLP2) audio+video stream-in pipeline execution. where, 192.168.25.90 is server’s IP address.

1 $ gst-launch-1.0 -v rtpbin latency=7 name=rtpbin udpsrc name=udpsrc_video buffer-size=60000000 caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H265" port=5004 ! rtpbin.recv_rtp_sink_0 rtpbin. ! rtph265depay ! h265parse ! video/x-h265, alignment=nal ! omxh265dec low-latency=1 ! video/x-raw\(memory:XLNXLL\) ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false 'video-sink=kmssink bus-id=a0070000.v_mix plane-id=33 hold-extra-sample=1 show-preroll=false sync=true ' sync=true -v udpsrc port=5005 ! rtpbin.recv_rtcp_sink_0 rtpbin.send_rtcp_src_0 ! udpsink host=192.168.25.90 port=5006 sync=false async=false udpsrc name=udpsrc_audio port=5008 caps="application/x-rtp, media=(string)audio, clock-rate=(int)48000, encoding-name=(string)OPUS" ! rtpbin.recv_rtp_sink_1 rtpbin. ! rtpopusdepay ! opusdec ! audioconvert ! alsasink device="hw:1,0" latency-time=5000 buffer-time=10000 udpsrc port=5009 ! rtpbin.recv_rtcp_sink_1 rtpbin.send_rtcp_src_1 ! udpsink host=192.168.25.90 port=5010 sync=false async=false

Above RTP+RTCP audio+video stream-in pipeline is applicable for streaming port = 5004 only. If the streaming port has changed, the respective port changes should be made in the pipeline to work. Refer to port description in streaming configuration parameters to understand how video and audio rtp/rtcp port numbers are assigned in LLL1/LLP2 audio+video stream-out pipelines.

For LLP1/LLP2 Multi-stream HEVC serial and stream-out use-cases (2-4kp30, 2-1080p60, 4-1080p60), use ENC_EXTRA_OP_BUFFERS=10 variable before vcu_gst_app command. The sample pipeline is given below:

1 $ ENC_EXTRA_OP_BUFFERS=10 vcu_gst_app /media/card/config/2-4kp30/Display/2_4kp30_HEVC_12_5_Mbps.cfg

The above macro is recommended to use for LLP1/LLP2 multi-stream HEVC use-cases only.

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

1 $ GST_DEBUG="GST_TRACER:7" GST_TRACERS="latency" GST_DEBUG_FILE=/run/latency.log vcu_gst_app /media/card/config/< path to *.cfg file>

Use GST_TRACERS="interlatency" in case of Xilinx’s ultra low-latency NV12 audio+video stream-out pipelines.

Refer below link for detailed run flow steps

1.3 Build Flow

Refer below link for detailed build flow steps


2 Other Information

2.1 Known Issues

2.2 Limitations

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.

Performance: AVC Encoder settings:

  • It is preferred to use 8 slices only for better AVC encoder performance.

  • AVC standard does not support Tile mode processing which results in the processing of MB rows sequentially for entropy coding.

Quality: Low bitrate AVC encoding:

  • 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.


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

Output:
Select the video interface.
Options: HDMI

Out Type:
Options: display 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, 2, 3, 4

Input Type:
Input source type.
Options: HDMI

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

Raw use-case is not supported for LLP2 use-case. It is supported for non-LLP2 use-case.

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

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

Format:
The format of input data.
Options: NV12

Enable LLP2:
To enable LLP2 configuration.
Options: True

Set Enable LLP2 equals to False for non-LLP2 use-case.

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, 2, 3, 4

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

Profile:
Name of the profile.
Options: high for AVC and main for HEVC.

Rate Control:
Rate control options.
Options: low_latency.

Filler Data:
Filler Data NAL units for CBR rate control.
Options: 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: 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: 1-25000

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

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 4K resolution with HEVC codec
4-32 4K resolution with AVC codec
4-32 1080p resolution with HEVC codec
4-32 1080p resolution with AVC codec

The recommended slice for LLP2 use-case is 8.

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

GDR Mode:
It specifies which Gradual Decoder Refresh(GDR) scheme should be used when gop-mode = low_delay_p
Options: Horizontal/Vertical/Disabled

GDR mode is currently supported with LLP1/LLP2 low-delay-p use-cases only

Entropy Mode:
It specifies the entropy mode for H.264 (AVC) encoding process
Options: CAVLC/CABAC/Default

Max Picture Size:
It is used to curtail instantaneous peak in the bit-stream using this parameter. It works in CBR/VBR rate-control only. When it is enabled, max-picture-size value is calculated and set with 10% of AllowedPeakMargin. i.e. max-picture-size =  (TargetBitrate / FrameRate) * 1.1
Options: TRUE/FALSE

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. In case of LLP1/LLP2 audio+video rtp stream-out pipelines, rtp/rtcp audio and video port numbers are assigned in below pattern in vcu_gst_app:

RTP/RTCP Port Type

Port Value

Actual Port Type Values, if Port = 5004

RTP/RTCP Port Type

Port Value

Actual Port Type Values, if Port = 5004

Actual video data rtp port

Port

5004

Tx Video rtcp packets port

Port + 1

5005

Rx Video rtcp packets port

Port + 2

5006

Actual Audio data rtp port

Port + 4

5008

Tx Audio rtcp packets port

Port + 5

5009

Rx Audio rtcp packets port

Port + 6

5010

Options: 5004, 5008, 5012 and 5016

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

Audio Configuration:
It is the starting point of the audio configuration.

Audio Enable:
Enable or Disable audio in pipeline.
Options: True, False.

Audio Format:
The format of the audio.
Options: S24_32LE (for serial use-cases), S16LE (for stream-out use-cases)

Sampling Rate:
To set the audio sampling rate.
Options: 48000.

Num Of Channel:
The number of audio channels.
Options: 1-2

Source:
It should be HDMI, as currently only HDMI audio capture is supported.

Renderer:
It should be HDMI, as currently only HDMI audio renderer is supported.

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.


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 NV12 and Xilinx’s Ultra Low-Latency NV12 Audio+Video pipelines for Display, Stream-In and Stream-Out use-cases.

  • HDMI source can be locked to any resolution. Run the below command for all media nodes to print media device topology where mediaX represents different media nodes. In the topology, log look for the v_hdmi_rx_ss string to identify the HDMI input source media node.

1 $ media-ctl -p -d /dev/mediaX
  • To check the link status, resolution and video node of the HDMI input source, run below media-ctl command where mediaX indicates media node for the HDMI input source.

1 $ media-ctl -p -d /dev/mediaX
  • When HDMI source is connected to 4kp60 resolution, it shows:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 root@zcu106_vcu_trd:~# media-ctl -p -d /dev/media3 -----> media node for HDMI input source Media controller API version 5.4.0 Media device information ------------------------ driver xilinx-video model Xilinx Video Composite Device serial bus info hw revision 0x0 driver version 5.4.0 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-subdev3 pad0: Sink [fmt:VYYUYY8_1X24/1280x720 field:none colorspace:srgb] <- "a0000000.v_hdmi_rx_ss":0 [ENABLED] pad1: Source [fmt:VYYUYY8_1X24/1920x1080 field:none colorspace:srgb] -> "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-subdev4 pad0: Source [fmt:RBG888_1X24/3840x2160 field:none colorspace:srgb] [dv.caps:BT.656/1120 min:0x0@25000000 max:4096x2160@297000000 stds:CEA-861,DMT,CVT,GTF caps:progressive,reduced-blanking,custom] [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]

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

  • When the HDMI source is not connected, it shows:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 root@zcu106_vcu_trd:~# media-ctl -p -d /dev/media3 -----> media node for HDMI input source Media controller API version 5.4.0 Media device information ------------------------ driver xilinx-video model Xilinx Video Composite Device serial bus info hw revision 0x0 driver version 5.4.0 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-subdev3 pad0: Sink [fmt:VYYUYY8_1X24/1280x720 field:none colorspace:srgb] <- "a0000000.v_hdmi_rx_ss":0 [ENABLED] pad1: Source [fmt:VYYUYY8_1X24/1920x1080 field:none colorspace:srgb] -> "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-subdev4 pad0: Source [fmt:RBG888_1X24/1280x720 field:none colorspace:srgb] [dv.caps:BT.656/1120 min:0x0@25000000 max:4096x2160@297000000 stds:CEA-861,DMT,CVT,GTF caps:progressive,reduced-blanking,custom] [dv.query:no-link] -----> HDMI-Rx Link Status -> "a0080000.v_proc_ss":0 [ENABLED]

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 a key on remote).

Notes for gst-launch-1.0 commands:

  • Video node for HDMI-Rx source can be checked using media-ctl command. Run below media-ctl command to check video node for HDMI-Rx source where media3 indicates media node for HDMI input source.

1 $ media-ctl -p -d /dev/media3
  • Make sure HDMI-Rx media pipeline is configured for 4kp60 resolution and source/sink have the same color format for connected nodes. For NV12 format, run below media-ctl commands to set resolution and format of HDMI scaler node where media3 indicates media node for HDMI input source.

  • When HDMI Input Source is NVIDIA SHIELD

1 2 $ media-ctl -d /dev/media3 -V "\"a0080000.v_proc_ss\":0 [fmt:RBG888_1X24/3840x2160 field:none]" $ media-ctl -d /dev/media3 -V "\"a0080000.v_proc_ss\":1 [fmt:VYYUYY8_1X24/3840x2160 field:none]"

Make sure NVIDIA SHIELD is configured for 4K resolution and RBG888_1X24 format.

  • Follow the below steps to switch the HDMI-Rx resolution from 1080p60 to 4kp60.

    • Check current HDMI input source resolution (1080p60) by following the steps mentioned earlier to check HDMI resolution using media-ctl command

    • Run vcu_gst_app for current HDMI resolution (1080p60) by executing the following command.

1 $ vcu_gst_app /media/card/config/input.cfg
  • Below configurations needs to be set in input.cfg for non-LLP2 HDMI-1080p60 use-case.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 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_1 Raw : FALSE Width : 1920 Height : 1080 Format : NV12 Enable LLP2 : FALSE Exit Encoder Configuration : START Encoder Num : 1 Encoder Name : HEVC Profile : Main Rate Control : Low_Latency Filler Data : False QP : Auto L2 Cache : TRUE Latency Mode : Sub_Frame Low Bandwidth : FALSE Gop Mode : Basic Bitrate : 25000 B Frames : 0 Slice : 8 GoP Length : 60 GDR Mode : Horizontal Preset : Custom Exit
  • Change Resolution of HDMI Input Source from 1080p60 to 4kp60 by following below steps.

    • Set the HDMI source resolution to 4kp60 (Homepage → Settings → Display & Sound → Resolution → change to 4kp60).

    • Save the configuration to take place the change.

  • Verify the desired HDMI Input Source Resolution (4kp60) by following the above-mentioned steps.

  • If HDMI-Tx link-up issue is observed after Linux booting, use the following command to get the blue screen on HDMI-Tx for 4kp60.

1 $ modetest -D a0070000.v_mix -s 38:3840x2160-60@BG24
  • The table below lists the parameters of the pixel format.

Pixel Format

GStreamer Format

Media Bus Format

GStreamer HEVC Profile

GStreamer AVC Profile

Kmssink Plane-id

Pixel Format

GStreamer Format

Media Bus Format

GStreamer HEVC Profile

GStreamer AVC Profile

Kmssink Plane-id

NV12

NV12

VYYUYY8_1X24

main

high

33 and 34

  • Video0 in the each gst-launch pipelines indicates a video node for the input source.

  • Make sure HDMI-Rx should be configured to 4kp60 mode, while running below example pipelines.

  • LLP1/LLP2 video / audio+video stream-in pipelines are not supported using vcu_gst_app.

  • For LLP1/LLP2 Multi-stream HEVC serial and stream-out use-cases (2-4kp30, 2-1080p60, 4-1080p60), use ENC_EXTRA_OP_BUFFERS=10 variable before gst-launch-1.0 command.

  • For LLP1/LLP2 Multi-stream serial and stream-in use-cases (2-4kp30, 2-1080p60, 4-1080p60), use internal-entropy-buffers=3 property in decoder.

  • latency-time and buffer-time in Audio+Video serial and streaming pipelines are very aggressive here compared to upstream GStreamer default values to get optimize latency for LLP2 Audio+Video pipeline. You can tune and experiment these parameters in case of any issue with audio/video sync, audio/video packet drop and audio distortion for your use-case.

Run the following gst-launch-1.0 command to display NV12 video on HDMI-Tx using low-latency(LLP1) GStreamer pipeline.

1 $ gst-launch-1.0 -v v4l2src io-mode=dmabuf device=/dev/video0 ! video/x-raw, width=3840, height=2160, format=NV12, framerate=60/1 ! omxh265enc num-slices=8 control-rate=low-latency gop-mode=low-delay-p target-bitrate=25000 cpb-size=500 gdr-mode=horizontal initial-delay=250 periodicity-idr=240 filler-data=0 prefetch-buffer=true ! video/x-h265, alignment=nal ! queue max-size-buffers=0 ! omxh265dec low-latency=1 internal-entropy-buffers=5 ! video/x-raw ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false 'video-sink=kmssink bus-id=a0070000.v_mix hold-extra-sample=1 show-preroll=false sync=true' sync=true -v

Run the following gst-launch-1.0 command to display NV12 video on HDMI-Tx using Xilinx's ultra low-latency(LLP2) GStreamer pipeline..

1 $ gst-launch-1.0 -v v4l2src io-mode=dmabuf device=/dev/video0 ! video/x-raw\(memory:XLNXLL\), width=3840, height=2160, format=NV12, framerate=60/1 ! omxh265enc num-slices=8 control-rate=low-latency gop-mode=low-delay-p target-bitrate=25000 cpb-size=500 gdr-mode=horizontal initial-delay=250 periodicity-idr=240 filler-data=0 prefetch-buffer=true ! video/x-h265, alignment=nal ! queue max-size-buffers=0 ! omxh265dec low-latency=1 internal-entropy-buffers=5 ! video/x-raw\(memory:XLNXLL\) ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false 'video-sink=kmssink bus-id=a0070000.v_mix hold-extra-sample=1 show-preroll=false sync=true' sync=true -v

Run the following gst-launch-1.0 command to capture and play Xilinx's ultra low-latency(LLP2) HDMI video and raw HDMI audio using the Gstreamer pipeline.

1 $ gst-launch-1.0 -v v4l2src io-mode=dmabuf device=/dev/video0 ! video/x-raw\(memory:XLNXLL\), width=3840, height=2160, format=NV12, framerate=60/1 ! omxh265enc gop-length=60 gop-mode=low-delay-p low-bandwidth=FALSE target-bitrate=25000 b-frames=0 num-slices=8 control-rate=low-latency qp-mode=auto prefetch-buffer=true cpb-size=500 initial-delay=250 gdr-mode=horizontal periodicity-idr=240 ! video/x-h265, alignment=nal, profile=main ! queue max-size-buffers=0 ! omxh265dec low-latency=1 internal-entropy-buffers=5 ! video/x-raw\(memory:XLNXLL\) ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false 'video-sink=kmssink bus-id=a0070000.v_mix plane-id=33 hold-extra-sample=1 show-preroll=false sync=true ' sync=true -v alsasrc device="hw:1,1" latency-time=5000 buffer-time=10000 ! audio/x-raw, channels=2, rate=48000, format=S24_32LE ! queue max-size-bytes=0 ! alsasink device="hw:1,0" latency-time=5000 buffer-time=10000

Run the following gst-launch-1.0 command to stream-out NV12 video using low-latency(LLP1) GStreamer pipeline. where, 192.168.25.89 is host/client IP address and 5004 is a port number.

1 $ gst-launch-1.0 -v v4l2src device=/dev/video0 io-mode=4 ! video/x-raw, format=NV12, width=3840, height=2160, framerate=60/1 ! omxh265enc num-slices=8 periodicity-idr=240 cpb-size=500 gdr-mode=horizontal initial-delay=250 control-rate=low-latency prefetch-buffer=true target-bitrate=25000 gop-mode=low-delay-p ! video/x-h265, alignment=nal ! rtph265pay ! udpsink buffer-size=60000000 host=192.168.25.89 port=5004 async=false max-lateness=-1 qos-dscp=60 max-bitrate=120000000 -v

Run the following gst-launch-1.0 command to display stream-in NV12 video on HDMI-Tx using low-latency(LLP1) GStreamer pipeline. where, 5004 is port number.

1 $ gst-launch-1.0 udpsrc port=5004 buffer-size=60000000 caps="application/x-rtp, media=video, clock-rate=90000, payload=96, encoding-name=H265" ! rtpjitterbuffer latency=7 ! rtph265depay ! h265parse ! video/x-h265, alignment=nal ! omxh265dec low-latency=1 internal-entropy-buffers=5 ! video/x-raw ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false video-sink="kmssink bus-id=a0070000.v_mix" sync=true -v

Run the following gst-launch-1.0 command to stream-out NV12 video using Xilinx's ultra low-latency(LLP2) GStreamer pipeline. where, 192.168.25.89 is host/client IP address and 5004 is a port number.

1 $ gst-launch-1.0 -v v4l2src device=/dev/video0 io-mode=4 ! video/x-raw\(memory:XLNXLL\), format=NV12, width=3840, height=2160, framerate=60/1 ! omxh265enc num-slices=8 periodicity-idr=240 cpb-size=500 gdr-mode=horizontal initial-delay=250 control-rate=low-latency prefetch-buffer=true target-bitrate=25000 gop-mode=low-delay-p ! video/x-h265, alignment=nal ! rtph265pay ! udpsink buffer-size=60000000 host=192.168.25.89 port=5004 async=false max-lateness=-1 qos-dscp=60 max-bitrate=120000000 -v

Run the following gst-launch-1.0 command to display NV12 stream-in video on HDMI-Tx using Xilinx's ultra low-latency(LLP2) GStreamer pipeline. where, 5004 is a port number.

1 $ gst-launch-1.0 udpsrc port=5004 buffer-size=60000000 caps="application/x-rtp, media=video, clock-rate=90000, payload=96, encoding-name=H265" ! rtpjitterbuffer latency=7 ! rtph265depay ! h265parse ! video/x-h265, alignment=nal ! omxh265dec low-latency=1 internal-entropy-buffers=5 ! video/x-raw\(memory:XLNXLL\) ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false video-sink="kmssink bus-id=a0070000.v_mix" sync=true -v

Run the following gst-launch-1.0 command to capture, encode and stream-out Xilinx's ultra low-latency(LLP2) HDMI NV12 video and opus encoded HDMI audio using the GStreamer pipeline. It enables transmission and reception of both RTP and RTCP packets. RTP packets are sent on ports 5004(for video) and 5008(for audio). sender RTCP packets are sent on ports 5005(for video) and 5009(for audio). The receiver RTCP packets are received on ports 5006(for video) and 5010(for audio). Here, 192.168.25.89 is client’s IP address.

1 $ gst-launch-1.0 rtpbin name=rtpbin v4l2src device=/dev/video0 io-mode=4 ! video/x-raw\(memory:XLNXLL\), format=NV12, width=3840, height=2160, framerate=60/1 ! omxh265enc gop-length=60 gop-mode=low-delay-p low-bandwidth=FALSE target-bitrate=25000 b-frames=0 num-slices=8 control-rate=low-latency qp-mode=auto prefetch-buffer=true cpb-size=500 initial-delay=250 gdr-mode=horizontal periodicity-idr=240 ! video/x-h265, alignment=nal, profile=main ! queue ! rtph265pay ! rtpbin.send_rtp_sink_0 rtpbin.send_rtp_src_0 ! udpsink port=5004 buffer-size=60000000 host=192.168.25.89 qos-dscp=60 max-bitrate=120000000 async=false max-lateness=-1 rtpbin.send_rtcp_src_0 ! udpsink host=192.168.25.89 port=5005 sync=false async=false udpsrc port=5006 ! rtpbin.recv_rtcp_sink_0 alsasrc device="hw:1,1" latency-time=5000 buffer-time=10000 ! audioconvert ! audio/x-raw, channels=2, rate=48000, format=S16LE ! opusenc ! rtpopuspay pt=97 ! rtpbin.send_rtp_sink_1 rtpbin.send_rtp_src_1 ! udpsink port=5008 host=192.168.25.89 sync=false async=false rtpbin.send_rtcp_src_1 ! udpsink host=192.168.25.89 port=5009 sync=false async=false udpsrc port=5010 ! rtpbin.recv_rtcp_sink_1

Run the following gst-launch-1.0 command to stream-in, decode and play Xilinx's ultra low-latency(LLP2) HDMI NV12 video and opus encoded HDMI audio using the GStreamer pipeline. It enables transmission and reception of both RTP and RTCP packets. RTP packets are received on ports 5004(for video) and 5008(for audio). sender RTCP packets are received on ports 5005(for video) and 5009(for audio). The receiver RTCP packets are sent on ports 5006(for video) and 5010(for audio). Here, 192.168.25.90 is server’s IP address.

1 $ gst-launch-1.0 -v rtpbin latency=7 name=rtpbin udpsrc name=udpsrc_video buffer-size=60000000 caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H265" port=5004 ! rtpbin.recv_rtp_sink_0 rtpbin. ! rtph265depay ! h265parse ! video/x-h265, alignment=nal ! omxh265dec low-latency=1 ! video/x-raw\(memory:XLNXLL\) ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false 'video-sink=kmssink bus-id=a0070000.v_mix plane-id=33 hold-extra-sample=1 show-preroll=false sync=true ' sync=true -v udpsrc port=5005 ! rtpbin.recv_rtcp_sink_0 rtpbin.send_rtcp_src_0 ! udpsink host=192.168.25.90 port=5006 sync=false async=false udpsrc name=udpsrc_audio port=5008 caps="application/x-rtp, media=(string)audio, clock-rate=(int)48000, encoding-name=(string)OPUS" ! rtpbin.recv_rtp_sink_1 rtpbin. ! rtpopusdepay ! opusdec ! audioconvert ! alsasink device="hw:1,0" latency-time=5000 buffer-time=10000 udpsrc port=5009 ! rtpbin.recv_rtcp_sink_1 rtpbin.send_rtcp_src_1 ! udpsink host=192.168.25.90 port=5010 sync=false async=false

Run the following gst-launch-1.0 command to capture, encode and stream-out Xilinx's ultra low-latency(LLP2) HDMI NV12 video and opus encoded HDMI audio using the GStreamer pipeline. It enables transmission of only RTP packets. RTP packets are sent on ports 5004(for video) and 5005(for audio).

1 $ gst-launch-1.0 rtpbin name=rtpbin v4l2src device=/dev/video0 io-mode=4 ! video/x-raw\(memory:XLNXLL\), format=NV12, width=3840, height=2160, framerate=60/1 ! omxh265enc gop-length=60 gop-mode=low-delay-p low-bandwidth=FALSE target-bitrate=25000 b-frames=0 num-slices=8 control-rate=low-latency qp-mode=auto prefetch-buffer=true cpb-size=500 initial-delay=250 gdr-mode=horizontal periodicity-idr=240 ! video/x-h265, alignment=nal, profile=main ! queue ! rtph265pay ! rtpbin.send_rtp_sink_0 rtpbin.send_rtp_src_0 ! udpsink port=5004 buffer-size=60000000 host=192.168.25.89 qos-dscp=60 max-bitrate=120000000 async=false max-lateness=-1 alsasrc device="hw:1,1" latency-time=5000 buffer-time=10000 ! audioconvert ! audio/x-raw, channels=2, rate=48000, format=S16LE ! opusenc ! rtpopuspay pt=97 ! rtpbin.send_rtp_sink_1 rtpbin.send_rtp_src_1 ! udpsink port=5005 host=192.168.25.89 sync=false async=false

Run the following gst-launch-1.0 command to stream-in, decode and play Xilinx's ultra low-latency(LLP2) HDMI NV12 video and opus encoded HDMI audio using the GStreamer pipeline. It enables reception of only RTP packets. RTP packets are received on ports 5004(for video) and 5005(for audio).

1 $ gst-launch-1.0 -v rtpbin latency=7 name=rtpbin udpsrc name=udpsrc_video buffer-size=60000000 caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H265" port=5004 ! rtpbin.recv_rtp_sink_0 rtpbin. ! rtph265depay ! h265parse ! video/x-h265, alignment=nal ! omxh265dec low-latency=1 ! video/x-raw\(memory:XLNXLL\) ! queue max-size-bytes=0 ! fpsdisplaysink name=fpssink text-overlay=false 'video-sink=kmssink bus-id=a0070000.v_mix plane-id=33 hold-extra-sample=1 show-preroll=false sync=true ' sync=true -v udpsrc name=udpsrc_audio port=5005 caps="application/x-rtp, media=(string)audio, clock-rate=(int)48000, encoding-name=(string)OPUS" ! rtpbin.recv_rtp_sink_1 rtpbin. ! rtpopusdepay ! opusdec ! audioconvert ! alsasink device="hw:1,0" latency-time=5000 buffer-time=10000