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Video Transcoding with Intel IPP Eric Shufro April 27, 2004 COT6930

Introduction to Transcoding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Transcoding Overview ,[object Object],[object Object],[object Object],MPEG-2 bit stream MPEG-4 bit stream MPEG-2 bit stream MPEG-4 bit stream Decode Encode Partial Decode and Encode 1 2

Applications ,[object Object],[object Object],[object Object],[object Object]

Integrated Performance Primitives ,[object Object],[object Object],[object Object]

MPEG-2 Decoder ,[object Object],[object Object],[object Object]

MPEG-4 Encoder ,[object Object],[object Object],[object Object],[object Object]

Transcoder Architecture ,[object Object],[object Object],[object Object],[object Object]

Transcoder Initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Input Stream ,[object Object],[object Object],[object Object],[object Object],[object Object]

Encoder Modifications ,[object Object],[object Object],[object Object],[object Object],[object Object]

Modified Parameters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Decoder / Encoder Interfacing ,[object Object],[object Object],[object Object],Transcoder is hard coded to work with 4:2:0 only

Motion Vectors ,[object Object],[object Object],[object Object],mp4enc.MBinfo->mv[0].dx = this->context->macroblock.vector_luma[0]; //x mp4enc.MBinfo->mv[0].dy = this->context->macroblock.vector_luma[1]; //y mp4enc.MBinfo->mv[1].dx = this->context->macroblock.vector_luma[2]; //x mp4enc.MBinfo->mv[1].dy = this->context->macroblock.vector_luma[3]; //y mp4enc.MBinfo->mv[2].dx = this->context->macroblock.vector_luma[4]; //x mp4enc.MBinfo->mv[2].dy = this->context->macroblock.vector_luma[5]; //y mp4enc.MBinfo->mv[3].dx = this->context->macroblock.vector_luma[6]; //x mp4enc.MBinfo->mv[3].dy = this->context->macroblock.vector_luma[7]; //y 16x16, 1MV 8x8, 4MV

Output Stream ,[object Object],[object Object],[object Object],[object Object],[object Object]

Image Comparison MPEG-2 to MPEG-4 with 1 MV and ME Enabled Mpeg-2 Mpeg-4

Peak Signal to Noise Ratio ,[object Object],[object Object],Error Image

PSNR of Sample Clip 1 MV 4 MV Graphs created by CalcPSNR, a freely distributed product of VideoSoft Inc. Motion Estimation Enabled

PSNR of Sample Clip 1 MV 4 MV Graphs created by CalcPSNR, a freely distributed product of VideoSoft Inc. Motion Estimation Disabled

Conclusion ,[object Object],[object Object],[object Object],[object Object]

Limitations ,[object Object],[object Object],[object Object]

References ,[object Object],[object Object],[object Object],[object Object]

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