Wilbert, is the source included in the zip linked to at the beginning of this thread the latest? I tried doing some simple optimization and got it running about 40% faster (about 210fps vs 145fps in YV12 on my comp) still with plain c code, but I'm wondering about a few things looking through it... in the constructor it checks mode against "Rec.709->Rec.601" and "Rec.601->Rec.709", yet in the main part it checks mode against "mpeg2->mpeg1" is this intended? In the YV12 mpeg1->mpeg2 it uses the "21" conversions and not the "12" conversions, but in the YUY2 code the mpeg1->mpeg2 does use the "12" conversions? Also, could you tell me or point me to a source that has the numbers for how the coefficients used were derived? I'm just curious, I tried to calculate them myself using coefficients from a few different websites, but they never work out to be exactly the same (usually off by 20-40 after multiplying by 65536). Thanks in advance.
Hm, must be because:
mpeg2source()
clip1 = last.colormatrix(mode="rec.601->rec.709")
clip2 = last.colormatrix(mode="rec.709->rec.601")
subtract(clip1,clip2)
coloryuv(analyze=true)
shows both clips to be identical
.