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MPEG A/V Encoder
  AL9V576 MPEG-4/2/1 Audio/Video Encoder
Functional Description

AL9V576 is a real-time MPEG-4/2/1 video/audio encoder chip that fully complies with ISO/IEC-11172, ISO/IEC-13818, and ISO/IEC-14496. The video encoder accepts uncompressed ITU-R BT.656. It filters the input and compresses the video into MPEG-4/2/1 formats. The audio encoder accepts two independent channels of digital audio, filters the input, and compresses each audio into MPEG-1, layer 2 audio formats. AL9V576 multiplexes the video and audio streams as transport streams for network applications or program streams for storage applications.


  • PCI MPEG-4/2 A/V capture card
  • USB 2.0 MPEG-4/2 A/V TV box
  • Surveillance PCI capture card (Multiple-channel)
  • IP network camera
  • Video server
  • Surveillance DVR
  • PVR/ PMP
  • MPEG-4 viewer
  • Wireless TV
  • Network video phone, etc.
Additonal Information
AL9V576 Brochure
Reference Kits
AL9V576B-EVB-A10  (MPEG-4/2/1 A/V USB 2.0 Grabber Reference Design)
AL9V576B-EVB-A12  (MPEG-4 Network TV/Video Server Reference Design)


  • High quality real-time MPEG-1, MPEG-2 MP@ML, and MPEG-4 ASP encoding.
  • Variable frame rate up to 30fps for NTSC and 25fps for PAL
  • Variable resolution from QCIF to full D1
  • Internal vertical and horizontal scaling down filters
  • Variable or constant bit rate (VBR/CBR) up to 8Mbps
  • Adaptive rate control and adaptive quantization algorithms
  • Automatic film/scene change detection
  • Variable GOP structure: I, IP, IBP, IBBP
  • Large motion estimation search window
  • High quality video pre-processing: both temporal and spatial filtering
  • Vertical/Horizontal luminance/chrominance filter
  • Speckle noise reduction
  • Recursive noise reduction
  • H/V cropping
  • MPEG-1 layer II audio encoding with psychoacoustic model
  • Variable audio sampling rate 32K, 44.1K, 48K Hz
  • Variable audio bit rate up to 384Kbps
  • MPEG-1 System Stream format
  • MPEG-2 Program Stream (PS) and Transport Stream (TS) format
  • MPEG-4 elementary stream format
  • Recordable VCD/DVD stream format
  • ITU-R BT.656
  • Digital audio input
  • 8/16/32-bit host interfaces (for 8051, Intel-style, SRAM-like & PCI)
  • 1/8-bit encoded bit stream output
  • 12 GPIO / Interrupt Multi-function IO pin
  • 2-Wire Serial bus (master mode)
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