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10th January 2003, 18:08 | #41 | Link | ||
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In order to do analog-to-digital conversion, you have to limit the input frequency to avoid aliasing. The optimum (maximum) frequency of that filter is called the Nyquist frequency. Variable filters are more expensive, so most cards use a set filter. To get the most out of their card (making it more attractive to you and me), they normally set the filter near the Nyquist frequency for the highest resolution that they can capture. Then when you choose a lower resolution, they have to do some extra work. In the worst case, they just throw out pixels. In the best case, they do some filtering elsewhere. Perhaps your card has a filter with two different settings, and in the preview mode they use a lower frequency. Again, I'm just making a guess here, but a lower filter would smooth out the artifact. Quote:
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10th January 2003, 18:16 | #42 | Link |
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i guess we may never know bout the card, but at least i found a nice solution
and yeah sorry, kinda hard to explain.. see here see the umm i guess massive staircase effect on the railing to the right?? its actually all through the video, it makes the cap totally useles really, its that bad, but taking that out you can see the nice clarity this card offers i hope i make myself easier to understand then last post
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
10th January 2003, 18:42 | #43 | Link |
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and THIS looks like "banding",doesn't it?
it's just too much in this sample! (on the tv transmission this was diagonal line parallel to the one the car is in? and it wasn't torn like this,but looked same as this parallel line?) with what codec was this captured? my suggestion (in PM) that card does some weird vertical resizing or so (on lores) isn't the answer in this case:because left side of the picture is prettyt ok,and right isn't! BUT(!!!!) daveqb DON'T make us all confused because you're capturing PAL at 640x480! you're in australia,right? it's pal country: it's either xxx x 288 or xxx x 576 for you my friend... (nothing else is aceptable in my mind....288 is too lousy for any bt device just let me add.....so do it properly:576 ) probably most of your "special effects" derive from that fact! capture at xxx x 576 and produce such results and then "hat down" from me! cheers Ivo |
10th January 2003, 19:36 | #44 | Link |
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I think ^^-+I4004+-^^ hit it on the head. You are in Australia, so you're dealing with PAL. When you specify 480 lines (640x480), your card has to convert from 576 lines to 480 lines. To scale down properly, it would require on-board memory to interpolate, which would add to the cost/complexity of the board, so they just throw out lines. In this case, they are throwing out 1 out of every 6 lines (480:576 = 5:6). This might not look so bad, except that TV is interlaced. In that case, they have to handle the fields separately. So they end up throwing out 1 out of every 6 lines in each field. But when these fields are recombined, you are really throwing out 2 out every 12 lines:
Code:
odd even 1 2 3 4 5 6 7 8 9 10 11 <-- thrown out 12 <-- thrown out 13 14 15 16 . . . Anyway, since you say your card will capture 640x480, which is a square pixel aspect ratio, then for PAL you should be able to capture 768x576, which is also square pixel. And for ALL your captures, from this point forward, I recommend that you use this resolution exclusively. If you want to go smaller, do so in software after you capture. For CIF, deinterlace and then scale down. If you just don't have the hard drive space, then capture at 384x288, but you'll have to live with the "stair-stepping" you saw above and possible aliasing caused by the filtering issue I mentioned above. Xesdeeni |
11th January 2003, 05:14 | #45 | Link | |
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"that card does some weird vertical resizing" nah, that block line is a horizontal thick like line, goes all the way across, maybe not the best pic to show it, its just what was on TT at the time point 2 i mustn't be making myself clear in my posts then iuVCR max capture with this card is 640x480 still a 1.3333 aspect ratio i tried AVI_io and it allowed 720x576 WOOHOOO! but when i started the cap it said "capture End" and then crashes if i try anything else the max res that works with AVI-io is 352x288 so therefore 640x480 is the highest i can get ATM maybe new drivers will help this out as the chipset supports 768x576 (checked the conexant site) PS did a few caps with the bt878 using the btwincap drivers @ 720x576 and then deinterlaced it and IMO not bad at all! But its not easy, programs crash and freeze with those BTwincap drivers (and yes i selected the right card during install) in fact the system wouldnt boot when i installed them, had to boot in safe mode, uninstall, and then re-boot and then let it install again on its own it appears cx23881 for low res and bt878 for high res, damn it! i wanted to sell one of these cards
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
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11th January 2003, 06:13 | #46 | Link |
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MAN! I should really have paid more attention to this thread. I knew the problems at capping at 480 in PAL all along (my card wanted to fix vertical res to 480 but I said NO!).
Sorry for no input earlier. |
11th January 2003, 06:31 | #47 | Link |
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Here's the time for the useful input
Dave and anyone... You can capture at any res you want in iuVCR, just change the settings in the registry. First, load up regedit (Run/ then type in REGEDIT) Then go to HKEY_CURRENT_USER\Software\ and DELETE the registry file for 'iuvs' (for a fresh start Close regedit and then run iuVCR, when you have selected your capture device, then quit it and load up REGEDIT Goto HKEY_CURRENT_USER\Software\ivus\iuVCR\4.X Then you go into whatever you see below that, for me it is something like "HKEY_CURRENT_USER\Software\ivus\iuVCR\4.X\||?|pci#ven_14f1&dev_8800&subsys_00000000&rev_03#3&61aaa01&0&50#{65e8773d-8f56-11d0-a3b9-00a0c9223196}|global" - but something different for you. Then expand that, load 'PRESETS' then expand that and go to whatever is next, for me it is "HKEY_CURRENT_USER\Software\ivus\iuVCR\4.X\||?|display#nvcap#5&c471e73&0&ca000002&01&00#{65e8773d-8f56-11d0-a3b9-00a0c9223196}|global\Presets\{00000000-0000-0000-0000-000000000000}" Then you start fiddling! Find the key "CaptureFrameHeight" - right click, then hit MODIFY. Change the value type to Decimal, then type in 576. Then change it to hexidecimal. Then click OK. You can also do the same for the preview. Do the same at "PreviewFrameHeight". It is simple. CLose regedit then load up iuVCR. From now on, DONT TOUCH THE CAPTURE FRAME HEIGHT until you have saved it as a preset. !Use a CUSTOM Aspect Ratio! You can change the width (ideally to 720) in iuVCR, you can also do that with the preview settings. Change framerate if necessary to 25, set your sound type in the audio settings block. Then save it as a preset. After you have saved a few you might want to use 720x576, 480x576... Then you can change your frame height to 288 if you were to capture cartoons or something like that. Now you will notice you wont be able to change it back to 576, it will max at 480 or whatever. Hope you can understand all of that crap I just wrote. Edit: on later investigation, if you set your frame height to 288 it will mess up all the rest of the presets and make them 288 aswell, to a fixed aspect ratio of 9x11?! Last edited by dar1us; 11th January 2003 at 06:33. |
11th January 2003, 15:45 | #48 | Link |
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Wow man!!
thanx heaps for that valuable information i will try that first thing in the morning ! (well after the gym anyway ) your da man!! (providing it works )
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
11th January 2003, 16:05 | #49 | Link |
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PS dar1us,
how did yuo get to keep your sig on your PC stats ?? i was told to remove mine by klona (he doesnt like any colour) just not post in the DVD forums ?? hehehe
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
12th January 2003, 07:03 | #50 | Link |
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No problem. I hope it works after writing all of that. You can see how it may work!
I have had no hassel about it, but if I was asked to remove it, I would. Ps, if you want to add something to a previous post, hit the EDIT button. No GYM for me, I am wallowing in the joy of not having to do that much, I have some unidentified illness, bloodtests on munday'. Wish me luck! I hope I have something bad because otherwise, the doctor will tell school, I had been skiving (or under stress - but I think I am too chilled for that Enjoy |
12th January 2003, 09:23 | #51 | Link |
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dar1us
YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! YOUR DA MAN!!! still gotta tweak it and get the colour right as you can see, but LOADS of potential! PS yeah use the edit alot, OCAU uses this same forum system! but doesnt matter coz ..............YOUR DA MAN!!!
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
12th January 2003, 10:09 | #52 | Link |
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Only one problem, you live in australia, and it is far too far away to look at that picture, my crappy ISDN times out before it finishes
Could you e-mail it to me or something, my e-mail address should be listed, but I am not posting it. Hope you have fun |
12th January 2003, 10:46 | #53 | Link | |
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really??? its only 42k's i'll email ya your using the same capture chipset hey?? send us a pic back, thanx
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
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12th January 2003, 11:19 | #54 | Link |
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It magically works now, instant download. Stupid pipe to australia (neither of our GREAT nations faults
See you have sky over there, is it Sky Digital, cos we use that here, and it really is great. My captures look virtaully the same. I am using a MSI TV@nywhere with a CX2331 or something chipset. It is set for a bright future. There are motion samples avalible here: http://www.ab296581.force9.co.uk/MSI-tvanywhere_6.avi http://www.ab296581.force9.co.uk/MSI-tvanywhere_7.avi http://www.ab296581.force9.co.uk/MSI-tvanywhere_8.avi The first isnt interlaced - and is the best. Enjoy |
12th January 2003, 12:49 | #55 | Link | |
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hmm thats funny, i cant get yuor samples now i'll try later, is this your own server ?? yeah same chipset here, i got the Prolink card though (only AU$95 ) i'll post some DivX captures if you like, hope the doc appointment works out for you on Monday
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12th January 2003, 13:06 | #56 | Link |
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Server works fine, just gave the wrong address, I missed out the 'Samples' subdirectory. It should be something like
http://www.ab296581.force9.co.uk/sam...anywhere_6.avi change 6 for 7 or 8 for the other 2 but 6 is the best one. Shame it ends on a bad frame. You will NOT get any better quality than that with that card. I cant see that happening. The colour tweaking is untouched and it is basically an exact replica, though at 720x576 Glad my little trick worked, spread the word. It may help unlock potential of other cards too. My CX chip had fixed itself to a max of 480 which is sooo annoying, damn Never the Same Colour Twice (NTSC!!!:!:!:::!!)!)!)!) EDIT: oh look, I have recently overtaken you on posts Can I expect you to reply to this 3 times to make up for them l8r |
12th January 2003, 13:41 | #57 | Link |
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
12th January 2003, 13:59 | #58 | Link |
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Thats odd, after Timeouts on my browsers behalf getting that simple picture, I am now pulling a top speed off your webspace.
Weird! Cheers, I anticipate that file. Seeing what kinda quality you can get! |
12th January 2003, 14:03 | #59 | Link |
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yeah they look bout the same, i guess you would expect that being the same chipset (heart of the whole card anyway)
its still interlaced, i didnt bother deinterlacing as it wasnt that bad. its takes some CPU usage to play back a compressed, hi-res file huh ? just noticed that. its not the best eg, i am in the middle of watching this game, but keeping missing bits coz i capture and then view bits of it. just so excitted with this quality thanx heaps for the regedit, i in fact have see that reg entry before (snooping around for where thr 30-day trial info is kept) but wasnt looking for res settings
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Can't we all just get along? Opty 146 @ 2.5Ghz || nForce3 ||1x330 + 3x120gig || CX23881 Capture Card OCAU || My blog Proud to be an Aussie! |
12th January 2003, 14:13 | #60 | Link |
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6 isn't interlaced, I left 7 and 8 interlaced because it gives the people a chance to have ago with their prefered method.
Also, if I did some shoddy deinterlacing and showed them off, it wouldn't look too fantastic Btw, if u are still there, what time is it in aus, it must be about +12 hours! (for the slow, I am GMT). You must be burning the candle at both ends so to speak |
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