I have a few .TS hidefs ... as do many round here nowadays ... but I can never get a really smooth playback on my main PC, let alone my HTPC. My main system is a P4 2.8 HT with XP Pro, ATI 9800Pro/128 with Catlayst 3.10 drivers, 512Mb ram and Seagate 120Gb IDE disks (5400 rpm for silence). Using VLC 0.72, what happens is that there's a sub-second 'stutter', noticeable whenever the camera pans or there's substantial motion on-screen. When this is happening the CPU load is barely 25% and the hard-disk light is blipping, thus neither the processor nor the disk seems to be throttling things. The ATI is on an 8x AGP slot with Fast Write enabled and apparently functional. Basically, I don't see why on earth this setup should have problems, seeing as how this material was presumably delivered by cable to the capper. What other system components come into the picture here? WM9 hidefs also cause problems but with those the CPU gets hit hard and so I'm not tuu surprised, in any case even if my 2.8 played them my 2100+ AMD HTPC wouldn't at present.