Linear Blend Requires XvMC?
I thought that XvMC only supported Bob, so why would linear blend require XvMC?
Deinterlacing and SDTVs
Is there any benefit to deinterlacing for display on regular SDTV (as in standard non-HDTV)?
A regular CRT TV running 50 Hz (PAL) or 60 Hz (NTSC) does not need deinterlacing unless the Graphics Adapter doesn't support the correct resolution for the local SD signal. For example PAL runs at 576i but some graphics cards will only do TV out in 640x480 or 800x600, so deinterlacing the image before it gets double scaled can improve the picture quality. But if you do have such a graphics card, which probably does not support Xv either, you should consider to get a new one (E.g a Nvidia FX5200 or 6200 based one for €35).