I just read on wikipedia that the radeon 4300/4500 have a minor revision of UVD called UVD2.2
According to the AMD website and wikipedia article and several forums:
-These card support full bitstream decoding of MPEG2(in UVD instead of the previous shader assisted decoding)
-These cards support Assisted decoding of MPEG1 and DIVX
-These cards fix compatibility with h264/vc1/mpeg2 files (possibly allowing for L5.1 decoding)
Does anyone have access to one of these cards? (the 4300 series is not recommended for any deinterlacing/post-processing testing)
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