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This page provides all the information related to Design Module 7 - VCU TRD Xilinx low latency(LLP2) PS DDR NV12 HDMI Audio Video Capture and Display design.

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2.2 Limitations

2.3Ā Optimum VCU Encoder parameters for use-cases

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Pixel Format

GStreamer Format

Media Bus Format

GStreamer HEVC Profile

GStreamer AVC Profile

Kmssink Plane-id

NV12

NV12

VYYUYY8_1X24

main

high

34 and 35

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

  • 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. You might observe higher latency when increasing latency-time and buffer-time values in pipeline (e.g. In LLP2 HDMI video and raw HDMI audio display pipeline we have used higher latency-time and buffer-time values to prevent audio distortion).

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