This page provides all the information related to Design Module 11 - VCU TRD Xilinx low latency(LLP2) PL DDR NV12 HDMI design.
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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.
For latency issue with llp2 audio+video pipeline, please refer AR# 75907- Why do I see spike in end to end latency while running VCU LLP2 audio + video design in streaming use case?
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.
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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 | 33 and 34 |
Video0in 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=10variable 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=3property in decoder.latency-timeandbuffer-timein 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.
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