The New Definitive HDTV Lag FAQ

I think the OP wanted the precedent of people NOT asking for lag tests…

It is probably better if we test things ourselves in a reliable fashion (i.e., not nonsense such as “I see a little lag” or “I don’t really see it”). The easiest way is through that Rock Band 2 test; if you have time to do the stopwatches (with a control CRT), that’s another option…

Is it frustrating for people who are looking to buy stuff? Yes it is. Frustrating for me too. I would like it to be an industry standard to display lag specs.

Still, how many different kinds of TVs are on the market right now?
Think about that and the possibility of people asking about each and every type of TV. That would make this thread a mess.

regarding the HD Box pro for the ps2, i would need a component cable first for the ps2, then the vga converter, and theoretically it should be lag free on my HDTV?

OK, so how can I test my tv for lag without the rockband 2. I have GH2/3 but I don’t think those tests are all that great, even though my rhythm is good. I have dual monitors hooked up, I read somewhere earlier about a test with that.

Here’s my TV:

Philips 42 inch 1080p, 120 htz. It has PC mode thru HDMI.

http://www.consumer.philips.com/consumer/en/us/consumer/cc/_productid_42PFL7403D_F7_US_CONSUMER/LCD-TV+42PFL7403D-F7

Ill test it as soon as I get a response, if all I can do is the guitar hero test I’ll do that and report back.

It has Component in / VGA out. So if your HDTV has a PC input, you just need a regular VGA cable and a component ps2 one.

that’s the same problem I have…and I have gotten that message when hooking up my PC via VGA and changing to other resolutions…so it seems the TV doesn’t accept such low resolutions…:sad:

http://www.x2vga.com/ is that any good?

I don’t know much about this stuff so would it be safe to say that computer monitors are the best way to go? It seems to me that if I’m designing a monitor I don’t need it to post process anything because that’s something that should be handled by your video card.

I’d just do a monitor if the prices wee more size friendly. After 24" or so the price/benefit ratio gets way out of whack.

Well I’ve already got a nice Dell 24" monitor. I was just wondering because of that.

Just a heads up to people, the Guitar Hero: Aerosmith demo on XBL Marketplace has a lag tester, so if you guys do not feel like buying a GH game, simply download that demo. The Guitar Hero III demo does not have it.

So, I have a full HD Samsung with native 1080p. If I have my PS3 display definition set to 420p, 720p, 1080i and 1080p and if the game native is 720p does my set upscales to 1080p or will it be at 720p? Also, how can I see the resolution that is being displayed using the remote as someone mentioned?

For the PS3 what I understood is that if the game is 720P native, then the PS3 does not upscale in hardware (maybe software or no upscale => software or no upscale will introduce lag on a 1080P TV). This is at the opposite of the 360 which does upscale any game if needed in hardware to 1080P with 0 lag. You must have a way on your TV remote control to identify the screen resolution.

Now for the North Amercian players, considering you don’t have the W4000/W4500 series and that the Samsung A650 picture quality is not great when setting it up for game via HDMI2 and PC mode : the advice would be as far as I am concerned to go to Panasonic plasma PZ85/PZ86/PZ800 which have virtually no lag with IFC turned off (which does not decrease any picture quality settings) and which have the best picture quality for the best price.

Someone should OP that info, that’s pretty damn useful.

http://www.lagom.nl/lcd-test/response_time.php#response_time_gif

So I did the dual monitor test and came up with a difference of .04. Take note that my 1080p tv was in 1440x900 not native, so im not sure how much that affect it (dual view takes the lower res monitor for both :/). This was my TV running on HDMI1 in PC mode. Ill test other modes via component, HDMI (non-pc), etc later on.

My TV:

Philips (42PFL7403D) 42 inch 1080p, 120 htz. It has PC mode thru HDMI.

Does anybody know whether or not HDMI switchers/splitters/matrices introduce lag? I know you can’t broad-stroke say yes or no, since i’m sure there are a ton of models out there that are junk, but something like this:

http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10110&cs_id=1011002&p_id=4920&seq=1&format=2

This would be perfect for my setup, as I’m thinking about buying an LCD Monitor to put next to my giant tv and having a stand-up SF4 setup, because sitting down ruins my energy in matches.

I can’t imagine it introduces lag, because it’s not processing anything, it’s just a giant throughput device, but has anybody checked into this or does anybody even give a flaming rat’s ass? =D

And no, i’m not asking somebody for test results, because that’s against the thread rules. I’m just asking if anybody has general info on this kind of tech. Don’t jump down my throat or I’ll punch your mom.

That’s actually a good question because some of these devices do re-amplify the HDMI signal, when reamplifying we can imagine that it introduces some lag depending on the components they use and buffering if any.

I’d say that if there is no re-amplification, there is no buffering and so no lag.

Actually no, both devices should have the same native resolution but I haven’t seen any lag test which compares the result with and without the native resolution of both screens.

The reason behind this is that if you don’t send the native resolution to the screen it would have to process the image to upscale it to 1080P while it shouldn’t and as a result changes the result. In your case though it’s the philips which does more processing that what it is supposed to.

However 40msec for a philips TV sounds realisticaly what other people of reported (40/60 msec as far as I recall for 7403 or 7603 can’t remember).

On a side note for the test you are doing you are supposed to take 10/15 pics and calculate the average input lag, not just one input lag as it changes a bit between pics.

In order to be sure that your test is working fine you can disable PC/Mode Game/Mode and enable all video enhancements feature your TV has and check the input lag again => it should be much worse, if it’s the same there is an issue.

I did take several screenshots and ill look thru them all. My tv is 1080p native and the monitor is 1440x900. The nvidia set my tv to 1440x900. I’ll redo the test and get back to you.

Other snapshot times are:

(PC MODE thru HDMI)
TV: 0.136
Monitor: 0.176

TV: 0.911
Monitor: 0.931

TV: 0.921
Monitor 0.941

TV: 0.387
Monitor: 0.397

Usual average is about .01, .04 being the worst.

(PC MODE off thru HDMI1)

TV: 0.031
Monitor: 0.081

TV: 0.485
Monitor: 0.525

TV: 0.314
Monitor: 0.334

TV: 0.033
Monitor: 0.083

Im gonna do the guitar hero test to test it thru component.

Indeed that’s quite good for the PC mode you 40/10/20/10 msec of lag, it’s a shame that these manufacturers don’t provide these numbers !

The test with PC mode OFF proves that your PC mode is working as expected :).

I’ll provide you tomorrow the results of my PZ86 once I get an DVI-HDMI converter, both screens won’t run in their native resolution as well so no sure how to read the results if they are not as good as expected.

The only way to get the best result would be to buy a 24" LCD which have a 1080P native resolution in addition to your current TV … but spending a ton of money to figure out the input lag is crazy that’s the manufacturer’s job !