DEC 00/ S-2
KHAN/KSU
MPEG-2 Transcoding
•The digital
video standard for DTV/HDTV.
–Compression
performance for high-end video
–Combines
co-efficient transform+predictive coding+ motion estimation.
•Extremely
computation intensive:
–Current
state-of-the art in video compression technology requires custom chipset
to obtain real-time performance in MPEG-2 encoding.
•Roughly
speaking, something close to CIF video (CCIR 4:2:0 CIF=352x240 at
30 frames/second or 352 x288 at 25 frames/second) can be decoded in
software satisfactorily. It requires processing of 69,300 blocks per
second.
•In comparison,
a broadcast quality video (CIR-601 4:2:2: 720x480 at 30 frames/second
or 352x576 at 25 frames/second) requires processing of 405,000 blocks
per second.
•a production
or medical quality video (MPEG-2
HIGH@HIGH-1440 profile=1920x1152x 60 frames/second) will require processing of
5,184,000 blocks per second.
•
–A full logic xcoder is encoder+decoder!