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S905Y4 4k AV1 decoding

Amlogic S905Y4 4K AV1 Decoding Specification

S905Y4 Overview

S905Y4 is the latest 4K AV1 Android TV decoder chip launched by Amlogic in 2021 with quad-core ARM Cortex-A35 CPU. support AV1  [email protected] video decoding.

General Description

S905Y4 is an advanced application processor designed for hybrid OTT/ IP Set Top Box (STB) and high-end media box applications. It integrates a powerful CPU/GPU subsystem, a secured 4K videoCODEC engine and a best-in-class HDR image processing pipeline with all major peripherals to form the ultimate low power multimedia AP.

The main system CPU is a quad-core ARM Cortex-A35 CPU with unified L2 cache to improve system performance. In addition, the Cortex-A35 CPU includes the NEON SIMD co-processor to improve software media processing capability.

The graphic subsystem consists of two graphic engines and a flexible video/graphic output pipeline. The ARM G31 MP2 GPU handles all OpenGL ES 3.2 Vulkan 1.1 and OpenCL 2.0 graphic programs,while the 2.5D graphics processor handles additional scaling, alpha, rotation and color space conversion operations. Together, the CPU and GPU handle all operating system, networking, user-interface and gaming related tasks. The video output pipeline includes HDR10 +, HDR10 and HLG processing,BT.709/BT.2020/BT.2100 processing, motion adaptive edge enhancing de-interlacing, flexible programmable scaler, and many picture enhancement filters before passing the enhanced image to the video output ports.

Amlogic Video Engine (AVE-10) offloads the Cortex-A35 CPUs from all video CODEC processing. It includes dedicated hardware video decoder and SW H.264/VP8 encoders. AVE-10 is capable of decoding 4Kx2K resolution video at 60fps with complete Trusted Video Path (TVP) for se- cure applications and supports full formats including MPEG-1/2/4, VC-1/WMV, AVS, AVS +, AVS2 RealVideo,MJPEG streams, AV1, H.264, H265-10 and also JPEG pictures with no size limitation.

The processor integrates all standard audio/video input/output interfaces including a HDMI 2.1 transmitter with 3D, Dynamic HDR(w/EMP), CEC and HDCP 2.2/2.3, ALLM (Auto Low Latency Mode) support, multiple TDM, PCM, I2S and SPDIF digital audio input/output interfaces, and 2 channel far-field PDM digital microphone (DMIC) inputs. It also has build-in Voice Activity Detection(VAD)module for ultra-low power operations during system standby.

It also integrates a set of functional blocks for digital TV broadcasting streams. The built-in demultiplexer can process the TV streams from the serial transport stream input interface, which can connect to external tuner/demodulator.

The processor has rich advanced network and peripheral interfaces, including a 10/100M Ethernet
MAC with and PHY interface, a set of multi- PHY for USB2, and multiple SDIO/SD card controllers,
UART, I2C, high speed SPI and PWMs.

Standard development environment utilizing GNU/GCC Android tool chain is supported. Please contact your AMLOGIC sales representative for more information.



Amlogic S905Y4


Quad-Core Cortex-A35 16500+ DMIPS


ARM Mali-G31 MP2, 850MHz


Widevine, Playready


HDR10/10+, HLG, Dolby Vision

Video Decoder

4Kp60 10bit: AV1/H.265/VP9 P-2/AVS2 4Kp30: H.264

This Post Has 12 Comments

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    AV1 is important

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