（精）实时视频转码算法.ppt

IMS Video Transcoder SolutionsMobile TV Communications Demo Multi-Channel Video Transcoding，Transrating Transsizing A bridge between H.264、H.263+，MPEG-4 standards Seamless Mobile Video Communications Allow Telecom equipment manufacturers to built IP Multimedia Subsystem(IMS) equipment with breakthrough price performance ratios Transcoder between H.264 Baseline Profile、H.263+ Profile 3 (Interactive and Streaming Wireless Profile)，MPEG-4 Simple Profile Transsizing between CIF and QCIF (QVGA) Transrating between incoming and outgoing bit rate within 2 M bps Compatible with the Freescale MSC8122 and MSC8144 DSPs. These contain four StarCore? SC140 or SC3400 DSP cores, respectively, and can operate at a maximum clock frequency of 500MHz or 1GHz per core, respectively Networking Application Low Power，Multi-Core，High Channel-Density For 14 slots, the theoretical maximum number of MSC8144 DSPs is 1,008. For transcoding between H.263+ and MPEG-4 SP is 126,000 channels of QCIF video at 15 frames/sec. For H.264 BP transcoding, 63,000 video channels. Key Features ? Transcoding, transrating and transsizing ? H.264 BP, H.263, H.263 + and MPEG-4 SP formats ? QCIF and CIF resolutions ? High channel density ? Low power ? Error resiliency ? Error concealment ? H.245 command support ? RTP packet and raw bit stream support ? CBR control ? Freescale MSC8122 and MSC8144 DSP implementations ? Freescale SmartDSP compliant APIs ? Optimized for mobile video telephony IMS infrastructure H.264 Compliance ? Baseline Profile ? Level 1 through 1.3 ? I and P slices ? Intra prediction 4x4 modes 0-8 ? Intra prediction 16x16 modes 0-3 ? Half and quarter pixel interpolation ? 16x16, 16x8, 8x16 and 8x8 macro block segmentations ? Frame coding ? All decoder block partitioning options ? In-loop de-blocking filter ? CAVLC coding MPEG-4 Compliance ? Simple Profile ? Level 0 through 3 ? I-VOP, P-VOP and AC/DC prediction ? 4-Motion and unrestricted motion vectors H.263+ Compliance ? Baseline