On Fri, 7 Nov 2008, Bjorn Danielsson wrote: > Carsten Meier <[EMAIL PROTECTED]> wrote: > >[...] > > All that is needed is a framebuffer (which the PVRUSB2 has) and a > > little bit of logic to "unhide" the lines and to put them in sequence. > > (I'm not an expert on this, just my guess... ;) ) > > Doing that in software on decoding of the MPEG stream is not possible > > because the additional information is already lost. > > OK, I think it would need at least firmware support to do this > inside the pvrusb2 device. > > And I'm not sure that the information gets lost after encoding > to MPEG2, doesn't it use YUV for color? If it were RGB all black > pixels would of course be (0,0,0) but black YUV pixels could keep > the non-zero "U" component where the hidden data is stored. > At least in theory.
I would be very surprised if the mpeg compression didn't cause the destruction of that extra data - the first goal of the lossy compression after all is to throw away data which doesn't otherwise impact the visual presentation. -Mike -- Mike Isely isely @ pobox (dot) com PGP: 03 54 43 4D 75 E5 CC 92 71 16 01 E2 B5 F5 C1 E8 _______________________________________________ pvrusb2 mailing list [email protected] http://www.isely.net/cgi-bin/mailman/listinfo/pvrusb2
