HTPC - TV Tuner Reviews
by Jarred Walton on December 7, 2005 12:05 AM EST- Posted in
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Image Quality Comparison
Comparing image quality among these cards is inherently a subjective task. Without investing in hundreds of dollars of hardware, you can't do a direct side by side comparison of the same video. In our last TV tuner round-up, Anand used content from CNN, since it loops about every 30 minutes. I'm less of a CNN-type person, so I choose to use content from various football games for the samples. Football has the added advantage of providing fast-paced video. Watching the camera pan down the football field stresses the codec, and you get the added benefit of being able to find many football games broadcast in 1080i and 720p HDTV.
Starting with the analog content, we have six sample points: FusionHDTV; MyHD using the Sempron, 4000+ and the X2 3800+; and finally two from the Theater 550 Pro. We set all configurations to use the best encoding possible, though the MyHD was CPU limited when running without the X2, resulting in very low encoding settings.
Looking at the full-size images, it should be pretty obvious that the Theater 550 provides the best analog quality. The MyHD, analog quality is terrible on the 4000+ and even worse on the Sempron. However, the quality using the X2 is actually very good. The Fusion5 analog quality isn't bad, but one thing that the image can't convey is the audio. All of our analog captures using the Fusion5 have a high-pitched squeal throughout the video. This appears to be a problem with the Fusion HDTV software, so using a different application should fix the issue. As we've already hinted, analog only users will definitely want to get a quality analog card as opposed to something like the Fusion5 or the MyHD. That brings us to the HDTV captures.
There really isn't a whole lot to say about the digital quality of the cards, other than that HDTV images are vastly superior to any analog/SDTV broadcast. As long as the card can receive the transport stream, the quality should be identical to any other card that can receive the transport stream. The card doesn't have to do any encoding, so if the signal is clean, the quality is exceptional. We didn't get an example of the Fusion5 capturing 1080i content, but there shouldn't be any difference from the MyHD capture. What we did provide is an upsampled 1080i sample. Needless to say, if you start with a 480i video, more than doubling the resolution isn't going to provide a clean result.
Incidentally, if you do get a card that can record digital transport streams, you might want a cost-effective way to play the videos on another HDTV. A $500 computer could probably get the job done, but you might not want another PC. Here's a home theater device that can play DVDs, DivX files, MPEG-1/2, and WMV9 (unprotected) videos. It can also handle TS/PS files (which are just a variant of MPEG-2). More importantly, it can do all this through the 10/100 Mbit network connection. If there's enough interest, we'll try to get one for review.
Comparing image quality among these cards is inherently a subjective task. Without investing in hundreds of dollars of hardware, you can't do a direct side by side comparison of the same video. In our last TV tuner round-up, Anand used content from CNN, since it loops about every 30 minutes. I'm less of a CNN-type person, so I choose to use content from various football games for the samples. Football has the added advantage of providing fast-paced video. Watching the camera pan down the football field stresses the codec, and you get the added benefit of being able to find many football games broadcast in 1080i and 720p HDTV.
Starting with the analog content, we have six sample points: FusionHDTV; MyHD using the Sempron, 4000+ and the X2 3800+; and finally two from the Theater 550 Pro. We set all configurations to use the best encoding possible, though the MyHD was CPU limited when running without the X2, resulting in very low encoding settings.
 MyHD Sempron |
 MyHD 4000+ |
 MyHD X2 3800+ |
 Fusion5 |
 Theater 550 |
 Theater 550 |
| Click on images to enlarge. | ||
Looking at the full-size images, it should be pretty obvious that the Theater 550 provides the best analog quality. The MyHD, analog quality is terrible on the 4000+ and even worse on the Sempron. However, the quality using the X2 is actually very good. The Fusion5 analog quality isn't bad, but one thing that the image can't convey is the audio. All of our analog captures using the Fusion5 have a high-pitched squeal throughout the video. This appears to be a problem with the Fusion HDTV software, so using a different application should fix the issue. As we've already hinted, analog only users will definitely want to get a quality analog card as opposed to something like the Fusion5 or the MyHD. That brings us to the HDTV captures.
 MyHD 720p |
 Fusion5 720p |
 MyHD 1080i |
 MyHD 1080i - upsampled 480i |
| Click on images to enlarge. |
There really isn't a whole lot to say about the digital quality of the cards, other than that HDTV images are vastly superior to any analog/SDTV broadcast. As long as the card can receive the transport stream, the quality should be identical to any other card that can receive the transport stream. The card doesn't have to do any encoding, so if the signal is clean, the quality is exceptional. We didn't get an example of the Fusion5 capturing 1080i content, but there shouldn't be any difference from the MyHD capture. What we did provide is an upsampled 1080i sample. Needless to say, if you start with a 480i video, more than doubling the resolution isn't going to provide a clean result.
Incidentally, if you do get a card that can record digital transport streams, you might want a cost-effective way to play the videos on another HDTV. A $500 computer could probably get the job done, but you might not want another PC. Here's a home theater device that can play DVDs, DivX files, MPEG-1/2, and WMV9 (unprotected) videos. It can also handle TS/PS files (which are just a variant of MPEG-2). More importantly, it can do all this through the 10/100 Mbit network connection. If there's enough interest, we'll try to get one for review.
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JarredWalton - Thursday, December 8, 2005 - link
Just to clarify, I'm speaking of overlay mode in general. The MyHD card overlay mode is limited to 720 x 484 reason. It does hardware decoding, which means it's generating the uncompressed HDTV stream on the card. A 720P compressed signal is up to 15 Mb per second. That presents no problem for the PCI bus. Uncompressed 720P, on the other hand, requires more bandwidth than the PCI bus can handle.1280 x 720 = 921600 pixels per frame
4 bytes per pixel = 3686400 bytes per frame.
60 frames per second = 221184000 bytes per second.
The PCI bus is a 32-bit bus, running at 33 MHz, giving a maximum bandwidth of 133 MB per second. Uncompressed 720P would require about 211 MB per second. This is one of many reasons that the AGP slot was created. The CPU can render into an AGP cards memory at up to 2133 MB per second, at least in theory.
So there is a reason that the my HD card doesn't render the overlay mode in anything more than 720 x 480. That doesn't mean I have to like that limitation. :-)
Crucial - Wednesday, December 7, 2005 - link
I don't understand what the point of this review was. Why would you test a hardware based analog card with 2 cards that have software based analog? The addition of the theatre 550 card was completely unecessary and frankly makes no sense at all.A more effective test would have put the 2 HD cards up against the ATI HDTV wonder and another seperate test putting the 550 against the Hauppage pvr150 and an Avermedia card.
The Boston Dangler - Wednesday, December 7, 2005 - link
Good oneJarredWalton - Wednesday, December 7, 2005 - link
The review was because I had the cards. We've had complaints about putting out single item reviews. We've already looked at the HDTV Wonder, and it doesn't work for me - no QAM support and I don't want to get an expensive OTA antenna for a rental home. The whole article is a "state of the TV Tuner market" as well as individual card reviews, or at least that's how I intended it. Besides, the Theater 550 PCIe is really just a PCIe version of the PCI card we've already looked at, which is good to know.Previous analog tuners have been reviewed, and the ATI HDTV Wonder has also been reviewed. If you can get good OTA DTV reception, you probably have no need for something like the Fusion5 or MyHD. For people like me, though, the choices boil down to forgetting about DTV, getting a DVR upgrade to my cable box, and/or getting one of those two cards.
After playing with all the cards, I would say your best bet for quality is to get two cards, one of analog and a second for DTV.
Ceramicsteve - Wednesday, December 7, 2005 - link
Hey can you include a Mac based HDTV tuner in your round up? The only one I know of is EyETV from Elgato systems and it comes in a form of a breakout box.scott967 - Wednesday, December 7, 2005 - link
I take it none of these tuners support HDCP on the digital out?scott s.
.
JarredWalton - Wednesday, December 7, 2005 - link
That's correct, though I may have screwed up when I talked about my TV. I don't know if it has an HDMI or an HDCP port. I thought it was HDMI, but I could be mistaken.Olaf van der Spek - Wednesday, December 7, 2005 - link
> Using the Sempron 64 running at 2.50 GHz was more than sufficient for everything but the MyHD analog recording.There are no Semprons that run at 2.5 ghz.
JarredWalton - Wednesday, December 7, 2005 - link
I had it overclocked -- I was trying to see if I could get it to work OK for the MyHD card.Olaf van der Spek - Thursday, December 8, 2005 - link
It may be a good idea to mentioned you were overclocking.