Features: 1) H.264(MPEG-4/Part 10) video compression standard leads to high compression ratio and good video quality 2) OggVorbis audio compression standard, with 16KHz sampling rate and 16Kbps output bit rate 3) Real-time video and audio compression, no frame loss 4) 4CIF preview resolution 5) Complies with PCI 2.2 standards: one PC can support up to 64 channels 6) Supports Windows 2000/XP and Linux operating systems 7) Less than 1 second delay in LAN 8) Settable I. B.P frame sequence 9) Settable video quality and bit rate 10) Settable brightness, contrast, saturation and hue of video signal 11) Supports motion detection 12) Supports watermark technology 13) Supports double encoding Advantages: H.264 encoding has the advantage of high image quality, low bit rate and low storage requirements, and is especially suitable for digital video security. The 4004HC board is a state-of-the-art video / audio compression board, which uses H.264 ACE (Advanced Code Efficiency) compression. The 4004HC board compression ratio is higher than those that use MPEG-1 or other standards. Given the same amount of hard disk space, the 4004HC board allows for longer recording time, thus reducing storage costs and maintenance expenses and improving system reliability.