spe99 0 Posted September 21, 2011 Hi ! I'm new here. I search over the Net about resolution. Now I understand nothing more about D1 / HD1 / CIF..... A big mixing in my head Some website or DVR Specification say for PAL, resolution is: for D1 720 x 576 pixels, while another say 4CIF = D1 = 704 x 576 pixels !!! for HD1 = 2CIF = 704 x 288 pixels, while another say HD1: 352 x 576 pixels !!! What is right reference ???? - D1 : 720 x 576 pixels - 4CIF / D1 : 704 x 576 pixels - 2CIF / HD1 : 704 x 288 pixels - HD1: 352 x 576 (HD1 = Half D1) - DCIF : 528 x 384 pixels - CIF : 352 x 288 pixels - QCIF : 176 x 144 pixels Is 4CIF = D1 ??? Is 2CIF = HD1 ??? Now what is wrong ?? Thanks for comments ! Best regards. S Share this post Link to post Share on other sites
Birdman Adam 0 Posted September 21, 2011 To make it even more confusing, the standards are different for NTSC and PAL systems... Share this post Link to post Share on other sites
spe99 0 Posted September 22, 2011 Hi. Thanks for comment. Yes, also NTSC... and NTSC values are welcome too ! Thanks. Best regards, Seb Share this post Link to post Share on other sites
survtech 0 Posted September 22, 2011 The way I learned it is: Format_____Video Resolution CIF/SIF(525)___352 x 240 CIF/SIF(625)___352 × 288 4CIF/4SIF(525)_704 x 480 4CIF/4SIF(625)_704 × 576 D1(525)_______720 x 480 D1(625)_______720 x 576 * Sometimes 4SIF/4CIF is specified the same as VGA, which is 640 x 480 / 640 x 576. * There is also 1/2 frame or 2CIF, which is based on removing the odd or even fields and is usually specified as either 640 x 240 or thereabouts. Share this post Link to post Share on other sites
Birdman Adam 0 Posted September 22, 2011 That is a good list I think! I have typically heard the 2CIF you are talking about being referred to as HD1 (half D1). Also, it seems 4CIF and D1 are so similar that it they are often used somewhat interchangeably. My rule is to always record at max resolution - either 4CIF of D1 depending on your DVR. When choosing a DVR, make sure it can hit your target FPS at the max resolution. Share this post Link to post Share on other sites
spe99 0 Posted September 23, 2011 Hi !! Thanks for nice comments. So - 2CIF = HD1 (= 4CIF/2 or D1/2) and it's egal to 704 x 288 pixels or 352 x 576 pixels can also be true ?? Now I need a find good DVR at affordable price... to many possibility... Hard choice.. My first Raysharp D9216 was a wrong choice for first experience... Best regards, Seb Share this post Link to post Share on other sites
shockwave199 0 Posted September 23, 2011 Aside from the obvious- getting D1 on all channels for the best shot at a good recording, I think it comes down to options as well. I'm still running my first dvr I put in line earlier this year, chosen with little understanding of specs. But as luck would have it, it's actually doing well and offers me options per channel. I only have D1 on the first two channels, which I knew going in. But that's enough for me. But per channel, I also have the option of HD1 and CIF. Per channel, I also have the option of frame rates from 1-30 fps, and bit rate options of low/med/high. So although I certainly don't have a high end dvr, the options give me the flexibility to balance out what I need per channel and I think that's a good thing too. Are these options typical to all dvrs, especially in the budget range? I don't know. So I suppose if you're getting a budget dvr, at least confirm that it's flexible in this area. And it's a good idea to DL the pdf manuals and see the real deal about what they can and can't do. Sometimes it's easier to figure out what the dvr can really do from the manual, as opposed to the spec page. Dan Share this post Link to post Share on other sites
rory 0 Posted September 23, 2011 SQCIF = 128x96 QCIF = 176x144 QVGA = 320x240 CIF = 352x240/288 HVGA = 640x240 VGA = 640x480 2 CIF = 704x240/288 4 CIF = 704x480/576 D1 CROPPED = 704x480/576 D1 = 720x480/576 Share this post Link to post Share on other sites
spe99 0 Posted September 27, 2011 Thanks for nice comments Dan, It's right, per channel flexibility is an important specification. And thanks Rory for the new table with all resolution values. Is it somewhere a site where we can enter desired characteristics and who it sorts out DVR results with some name and models ? Share this post Link to post Share on other sites
ISU4US 0 Posted March 27, 2013 Please lend me a hand, What dos it mean 525 & 625? The way I learned it is: Format_____Video Resolution CIF/SIF(525)___352 x 240 CIF/SIF(625)___352 × 288 4CIF/4SIF(525)_704 x 480 4CIF/4SIF(625)_704 × 576 D1(525)_______720 x 480 D1(625)_______720 x 576 * Sometimes 4SIF/4CIF is specified the same as VGA, which is 640 x 480 / 640 x 576. * There is also 1/2 frame or 2CIF, which is based on removing the odd or even fields and is usually specified as either 640 x 240 or thereabouts. Share this post Link to post Share on other sites
tomcctv 190 Posted March 27, 2013 Please lend me a hand, What dos it mean 525 & 625? The way I learned it is: Format_____Video Resolution CIF/SIF(525)___352 x 240 CIF/SIF(625)___352 × 288 4CIF/4SIF(525)_704 x 480 4CIF/4SIF(625)_704 × 576 D1(525)_______720 x 480 D1(625)_______720 x 576 * Sometimes 4SIF/4CIF is specified the same as VGA, which is 640 x 480 / 640 x 576. * There is also 1/2 frame or 2CIF, which is based on removing the odd or even fields and is usually specified as either 640 x 240 or thereabouts. D1 (525) 720 x 480 is in NTSC D1 (625) 720 x 576 is in PAL PAL gives more lines then NTSC Share this post Link to post Share on other sites
ISU4US 0 Posted March 27, 2013 Thank you very much Please lend me a hand, What dos it mean 525 & 625? The way I learned it is: Format_____Video Resolution CIF/SIF(525)___352 x 240 CIF/SIF(625)___352 × 288 4CIF/4SIF(525)_704 x 480 4CIF/4SIF(625)_704 × 576 D1(525)_______720 x 480 D1(625)_______720 x 576 * Sometimes 4SIF/4CIF is specified the same as VGA, which is 640 x 480 / 640 x 576. * There is also 1/2 frame or 2CIF, which is based on removing the odd or even fields and is usually specified as either 640 x 240 or thereabouts. D1 (525) 720 x 480 is in NTSC D1 (625) 720 x 576 is in PAL PAL gives more lines then NTSC Share this post Link to post Share on other sites
vector18 1 Posted March 27, 2013 My PAL always gives me more lines than my non PALS. Share this post Link to post Share on other sites
