LimitedSharpen, great for some DVDs bad for others...why?

[shaolin95]

Hi!
I noticed that LimitedSharpen works awesome with some DVDs like , LOTR Two Towers, Die Another Day, Austin Powers GoldMember but also looks bad with others like both Superbit Underworld and Fifth Element. Two towers looks awesome and dare I say detail looked even better than the HD version I saw before it. But Underworld and 5th Element show many distrubing artifacts. Is there any reason for this? What is the prefered sharpener among forum members for real time ffdshow use?
Regards

[Mug Funky]

superbit editions, huh? they should look fine without any enhancement at all...

if you used mpeg2source's postprocessing, it might have made the grain pump a little in the superbit stuff - i've noticed this before, but it's a very title-specific thing.

btw, where does one get a superbit edition of 5th element? that's a cool movie :)

[Revgen]

They are sold here in the USA (R1). But they're kind of hard to get a hold of.

amazon.com sells them for about $25. But they'll take about 7 or 8 days to be ready to ship.

[shaolin95]

Well its not grain the problem more like strange artifacts mainly among vertical lines which I think have to do with warpsharp or something like that. I some times need to change between unsharp and limited sharpen depending on the movie. Superbit titles are good but its not day and night vs regular version unless its a crappy one. For instance the regular Fifth Element is just a little inferior to the Super Bit one...of course for us a little is all we need but for regular people they wont even see the difference. Now Fifth Element High Def is another story... BTW, Best Buy has most Superbit Titles for only $9.99. Good deal

[Mug Funky]

heh. i always considered it a bit of a gimmick to be honest. unless the disc just has too much on it (you know... those special features people watch once then wish they had that hour-and-a-half of their lives back?) it will have as high a bitrate as can be fit on it without playback issues.

although the superbit/hi-bit branding i suppose reflects more a philosophical difference than a practical one - on a superbit disc the feature is the priority rather than any extras which are usually boring and low quality.

only problem is superbitters often also carry full data rate DTS audio, which reduces the max bitrate of the feature, often by quite a bit. 9800 - 1536 - 448 - subtitles ~= 7800 kbps max rather than the safe max of 8500. if you calculate with 10080 instead you get about max 8000, but that's still too low and will probably underflow constantly.