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What's the Point of Building a Home Theater PC?
An anonymous reader writes "FiringSquad has written Building a Basic HTPC. They discuss why Building a HTPC only makes sense if it can do something better than any other commercially available solution, as well as why HTPC should integrate act like a component not a computer. They also go into upsampling of DVDs to HDTV."
Building a Basic HTPC
February 03, 2004
Summary: You've read about building no-budget Dual Opteron workstations, and RAID-less storage servers and even air filters at FiringSquad. Today we'll be looking at Building a Basic Home Theater PC. If you're thinking Small Form Factor ATX, you haven't learned anything from our previous articles. This HTPC is designed for two purposes only: high-definition upsampling of DVD video and personal video recording. If you ever wondered how DVD's can look better when brought to HDTV resolutions even though the source is the same, read inside.
IntroductionPage:: ( 1 / 10 )
The HTPC or "Home Theater PC" is a popular but often nebulous concept. Everyone would agree that a fundamental component is that the pc be connected to a television but what the HTPC is used for is something to debate. Some people use a HTPC to play games on the big screen, while others see it as a way to enjoy high-quality DVD, others see it as a music/video/image jukebox, and still others see it as a way to get a low-cost HDTV by using a desktop monitor rather than TV.
The problem with having a HTPC doing multiple tasks is that it becomes more difficult to integrate the software and yet your wallet gets thinner and thinner. Instead of starting off with a full-fledged HTPC, we're going to start with a very introductory approach to the HTPC and then through follow-up articles, add more features.
For this introductory HTPC article, we have two very specific tasks: DVD upsampled to HDTV resolutions, and a personal TV recorder. Since we're "lazy," our HTPC needs to perform like a real piece of home theater equipment as much as possible. The system should integrate itself seamlessly, and shouldn't force the user to think about it as a computer. The HTPC also has to have an advantage over a similar dedicated component ** there's no point in reinventing the wheel unless you can make it faster, smaller, and cheaper.
Why these two tasks?
We've designed this system as an ideal starting point for anyone with a "HDTV ready" television.
Having a PC-based TIVO is ideal for a number of reasons. The most important factor is cost. Both TIVO and ReplayTV charge a subscription fee and ridiculous premiums for larger hard drives. With a PC, you can add and replace IDE hard drives on a whim and also enjoy free TV listings. In addition, it is possible to enjoy higher quality video through a PC-based system through improved video scaling than would otherwise be possible with a standard unit.
Finally, ATI and other third-party software applications have media server applications that will allow their multimedia products to stream video to client systems on your desktop, and NVIDIA is expected to add this capability to its Personal Cinema line in the near future.
The upsampled DVD is the more important feature in our HTPC today. Even if cost is no object, the HTPC approach to DVD can offer better picture quality than any stand-alone unit. DVDs are recorded with 480 lines of resolution, however it turns out that upsampling the video to a 720p or 1080i resolution for HDTV and HDTV-ready televisions will offer the best quality.
It's a real phenomenon
One of the most often confused concepts is the idea that upsampling DVDs to HDTV resolutions will make DVDs look as good as HDTV. It doesn't seem as if this is possible -- the data is not present to begin with. The real answer is that while an upsampled DVD isn't as good as true HDTV, it will look better than a straight 480 progressive lines of resolution. Here's why**
HDTV-ready CRT
Like a CRT PC monitor, an HDTV-ready CRT can sync at multiple resolutions. The catch is that the electron beam is not designed to change in size depending on the resolution (it changes but not by design). Suppose you have a 19" monitor running at 1280x1024 or 1600x1200. While reading this webpage, look at the white background. Get as close to the screen as you can to study the white. Now, change your monito
1) Play DVDs. More advanced features than standalone players, such as bookmarking (that allows you to skip that pesky 'forced' content), multiregion playback etc.
2) Play games on a big TV with decent 5.1 sound.
3) Play MP3s from a central server through your stereo.
4) Used by people with high end projectors to deinterlace video signals.
5) Confirm your geekiness.
Last year I found myself with an old AMD 800mhz PC, missing just the monitor (total value probably $100). I also have lots of divx movies. Converting the movies to MPEG, splitting them, and burning them to CDs so that I could watch them in my DVD player was a pain. Watching them on a computer was even worse. So, I hooked up my PC to the TV, put the PC on my wireless network, and now I have a "HTPC". Total cost to me -- $40 for a wireless network card.
Now I'm in the process of installing MythTV on that PC (total cost $200 for a encoder/decoder card), and I'll have an awesome PVR without having to pay any monthly fees.
There's no reason that your wallet needs to get thinner and thinner. If you are interested in a PVR (ie. Tivo), then you actually save piles of money by not having to pay the monthly Tivo fee.
"The market alone cannot provide sufficient constraints on corporation's penchant to cause harm." -- Joel Bakan
The Antec case is too big, it falls off the back of your other home theater components. And why use a Radeon? Who wants to *only* upscale DVDs to HD resolution? Isn't the point of watching HD being able to receive HD broadcasts too?
Alternative configuration:
Mini-ITX system (the case will fit on top of the TV) like those from casetronic.com, with a VIA 800 or better.
MyHD HD Tunerboard (will upscale DVDs and tune HD/SD broadcasts).
VGA to component breakout cable connected from the MyHD's output directly to your set.
Install XP or 2K, put the MyHD IR control app in the winblows startup folder, and never look at the windows desktop again, since the MyHD has an OSD on the HD output.
With this config you can tune HD broadcasts and upscale DVDs for less.
Maybe it wouldn't make as much sense if you are truely building from scratch, but this is slashdot. How many peeps here don't have a basement/closet full of spare parts. If you have a box sitting around, it's much cheaper than say a replayTV or MCE Windoze box. Part of building your own is the fun. Aside from that, you can cusomize your own box a lot more than a tivo or replaytv. Mame anyone? Check out MythTV for a cool OSS project or MyHtpc.net for a really cool, community driven front-end. For an all around informative site about hardware, and mostly windows frontend software, check out ruel.net It's more tweaking and screwing around, but more adaptable too.
Tech News, Reviews and Tutorials
Finally, I settled on buying a computer to do all of this. I had quite a few of the parts I needed; the only thing I was missing was an OTA tuner card, the DVD software, and the sound card. I already had decided on Windows XP (which I will explain below), so I was set.
The DVD software I went with was called TheaterTek and the benefits it had over a standard player are numerous:
- Ability to resize any move to any resolution including 1080i
- Ability to expand the movie to get rid of the black bars around the edge (i.e. anamorphic widescreen)
- Ability to save these changes for each individual movie
- Using Windows to further enhance the output using various filters (i.e. fdshow filters)
The output from this setup was incredible. Watching DVDs at 1080i with the image cleaned up is so much better than 480p. I highly recommend it.The other problem was getting the actual HD content from the main networks. Locally in Omaha, NE ABC, CBS, and NBC have been broadcasting in HD for a while, so an OTA tuner was the way to go. A stand alone box was going for $600 locally, and I had found a card that does it for $200, the MyHD OTA Tuner Card. The picture quality is incredible and the performance was great on my 850 Duron. It gave me everything the set top box would have done and also Tivo like functionality out of the box, something that still isn't available for HD yet.
As I mentioned before, I went with Windows XP as everything mentioned above is only available for that platform. Also, due to the mature video drivers on Win32 vs. Linux for the ATI card I went with, I was able to tweak more aspects of the output to the HD monitor through a program called Powerstrip. I tried DVD playback on Linux (mplayer), but it had no where near the functionality of the Theatertek software. Also, I did look into the pcHDTV card available, but it isn't nearly has mature as it should be for a commercial HD tuner card (the only user fiendly app I have found, MythTV, has very limited integration with the pcHDTV card. That is changing quickly, though).
All in all, I highly recommend making a HTPC if you have the time. Plus, you don't need that Microsoft Windows Media Center Edition crap to make it work, just plain old XP will do you fine.
Bryan R.
The price of freedom is eternal vigilance, or $12.50 as seen on eBay.....
Just barely. An HTPC really is a good deal, depending on what you're trying to do.
It depends entirely on what you want to do. Consider my situation-- I had an HD-ready set, and wanted an OTA tuner and the ability to record HD broadcasts digitally.
Like a lot of people around here, I had an old PC laying around doing nothing. I bought an HDTV tuner card for $120 (used, new would have been $199) and stuck it in. Now I can record 10 hours of HDTV, and tune my local stations. A standalone tuner box would have been a minimum of $300, and the ability to record (maybe with a digital VCR) would have been another $300.
The MyHD MDP-100 tuner card has the nice side effect of being able to play back DVDs, and upscale the output to 1080i or 720p digitally. And because it's a hardware MPEG card, it doesn't need much of a system to run it. A PIII and 128MB of PC100 is well more than it really needs.
It wasn't $700 or $200, though-- it was $120. Aesthetically, it fits entirely behind the TV, and the one case fan isn't too noisy. Because I only use it for 2 or 3 shows a week, it's off the rest of the time and noise is not an issue.
Down the road, I'll build a better system-- but heck, even at $700, it beats out a 1080i DVD player (or standalone scaler and normal DVD), OTA HD tuner, and HD recording solution price-wise. A $30 ATI dongle lets me play PC games on the big screen in HD, too, so add an XBox with a component kit to that list.
They really can be price-competitive with a lot of other things, and a good quiet case and heatsink with underclocked CPU can really give you some advantages you can't get without spending a TON of money to do it another way.
When the HD Tivo is $300, *then* I'll have something to switch to. (but it still won't do the games, DVD scaling, or archive the HD shows to Xvid or WM9-- so my HTPC will probably soldier on.)
I have an Infocus X1, and it has a the DCDi chip from Farouja in it. It upsamples 480p to 800x600 automatically, but.. here's the funny thing. 480i looks BETTER on this projector, because the Farouja chip does a better job of deinterlacing and inverse 3:2 pulldown than the "Progressive Scan" DVD player I have. So I don't even use 480p, I use 480i over component for DVDs and Composite from my DirecTV dish (the DTV signal is only 480x480 resolution mpeg-2 and look actually WORSE coming out the S-video jack, it emphasises the MPEG-2 compression and makes everything blocky on the projector.. Composite smooths those out because it's blurry)
So the answer to the big question here is.. if you have a GOOD projector or monitor with a GOOD deinterlacer/scaler chipset, then you don't need a HTPC. If you don't, then a HTPC can get you good deinterlacing/scaling for your DVDs.
BTW.
http://deinterlace.sf.net for a Windows Deinterlacer
or
http://tvtime.sf.net for a Linux Deinterlacer.