How to Turn DV 1.5 aspect ratio to 1.0 multimedia ratio at DVinfo.net

February 22nd, 2003, 03:44 AM

I tried to import the footage via firewire as 1.0 aspect ratio and stayed 1.0 in NEL but somehow I get footage that is 1.5 aspect ratio anyway. Can someone please give me a instruction as to how to turn dv footage into 1.0 ratio so i can webbed the footage into 320x240 instead of 360x240.

David Hurdon · February 22nd, 2003, 06:36 AM

DV (NTSC) has a 0.9 pixel aspect ratio (non-square pixels). Don't try to change that in capture. You can set your export frame size for multimedia in the encoding parameters you choose once you're ready to compress a project.

February 22nd, 2003, 10:32 AM

I am so confused with this .9 aspect ratio thing. The footage shot in DV is 3:2 ratio where regular NTSC is 4:3. But people says it's good to turn my video into DV 3:2 ratio to 4:3. But when I do that, people in the video looks squished. Am I suppose not to change it from .9 to 1.0?

Maybe I got so used to watching .9, 3:2 video on computer monitor that correct ratio is now looking funny?

Rob Lohman · February 23rd, 2003, 06:16 AM

If you incorporate the 0.9 pixel aspect in the resolution of the DV
you will get a 4:3 frame aspect, so it is correct. For output to TV
you should not change your pixel aspect (or frame aspect/size)!

All NLE's know that the aspect is 0.9 (or 1.067 for PAL) and will
(if I'm not mistaken) show the footage correctly. If you want to
output to a digital file that does not understand aspect ratio
(MPEG will for example) you can resample the resolution to 640
(or 648) x 480. That should give you correct aspect on a computer
screen.

February 23rd, 2003, 09:45 AM

<<<-- Originally posted by Rob Lohman : All NLE's know that the aspect is 0.9 (or 1.067 for PAL) and will (if I'm not mistaken) show the footage correctly. If you want to output to a digital file that does not understand aspect ratio (MPEG will for example) you can resample the resolution to 640 (or 648) x 480. That should give you correct aspect on a computer screen. -->>>

I see. Well I just installed WMP9 and it started playing back my DV footage @ 640 x480 instead of 720 x 480 like WMP 6.4 did. And the result of 640 x 480 footage looks strangely squished. So I imported DV footage again using Vegas Video 4.0 as 0.9, and Then re-sampled it (on time line, right click and check box says resample and turn the ratio to 1.0 multimedia) and it look just about the same (all squished).

What am I doing wrong here.

Rob Lohman · February 23rd, 2003, 05:55 PM

Did you shoot it at 16:9 by any chance?? Can you put up a still
picture or e-mail me one?

February 23rd, 2003, 06:56 PM

<<<-- Originally posted by Rob Lohman : Did you shoot it at 16:9 by any chance?? Can you put up a still
picture or e-mail me one? -->>>

Yes, I'll email a picture. Thank you.

Mike Rehmus · February 23rd, 2003, 08:18 PM

If you want 1:1 aspect ratio footage, you are going to have to shoot withing a 1:1 ratio box and then crop the video to that ratio for your application. You cannot adjust the dimensions of the video in order to make 1:1.

If you have a PD150 you can load a 1:1 mask into the memory stick and overlay that over your video.

February 23rd, 2003, 09:09 PM

Uh Ha!

So 360x240 IS the correct aspect ratio for encording streamable video over the internet played on computer, if the original footage is shot in DV (PD150 normal mode). No wonder anything I read made any sense. 720x480 3:2 ratio looks normal to me. So it only make sense to encode video in 360x240 which is also 3:2.

Thank you,

Anne the Ragady

February 22nd, 2003, 03:44 AM	#1
Guest Posts: n/a	How to Turn DV 1.5 aspect ratio to 1.0 multimedia ratio I tried to import the footage via firewire as 1.0 aspect ratio and stayed 1.0 in NEL but somehow I get footage that is 1.5 aspect ratio anyway. Can someone please give me a instruction as to how to turn dv footage into 1.0 ratio so i can webbed the footage into 320x240 instead of 360x240.

February 22nd, 2003, 06:36 AM	#2
David Hurdon Major Player Join Date: Nov 2002 Location: Toronto, Canada Posts: 484	How to Turn DV 1.5 aspect ratio to 1.0 multimedia DV (NTSC) has a 0.9 pixel aspect ratio (non-square pixels). Don't try to change that in capture. You can set your export frame size for multimedia in the encoding parameters you choose once you're ready to compress a project. __________________ Site:http://www.faceliftmarketing.ca Blog:http://www.websitevideo.blogspot.com

February 22nd, 2003, 10:32 AM	#3
Guest Posts: n/a	I am confused I am so confused with this .9 aspect ratio thing. The footage shot in DV is 3:2 ratio where regular NTSC is 4:3. But people says it's good to turn my video into DV 3:2 ratio to 4:3. But when I do that, people in the video looks squished. Am I suppose not to change it from .9 to 1.0? Maybe I got so used to watching .9, 3:2 video on computer monitor that correct ratio is now looking funny?

February 23rd, 2003, 06:16 AM	#4
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	If you incorporate the 0.9 pixel aspect in the resolution of the DV you will get a 4:3 frame aspect, so it is correct. For output to TV you should not change your pixel aspect (or frame aspect/size)! All NLE's know that the aspect is 0.9 (or 1.067 for PAL) and will (if I'm not mistaken) show the footage correctly. If you want to output to a digital file that does not understand aspect ratio (MPEG will for example) you can resample the resolution to 640 (or 648) x 480. That should give you correct aspect on a computer screen. __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

February 23rd, 2003, 05:55 PM	#6
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	Did you shoot it at 16:9 by any chance?? Can you put up a still picture or e-mail me one? __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

February 23rd, 2003, 09:45 AM	#5
Guest Posts: n/a	<<<-- Originally posted by Rob Lohman : All NLE's know that the aspect is 0.9 (or 1.067 for PAL) and will (if I'm not mistaken) show the footage correctly. If you want to output to a digital file that does not understand aspect ratio (MPEG will for example) you can resample the resolution to 640 (or 648) x 480. That should give you correct aspect on a computer screen. -->>> I see. Well I just installed WMP9 and it started playing back my DV footage @ 640 x480 instead of 720 x 480 like WMP 6.4 did. And the result of 640 x 480 footage looks strangely squished. So I imported DV footage again using Vegas Video 4.0 as 0.9, and Then re-sampled it (on time line, right click and check box says resample and turn the ratio to 1.0 multimedia) and it look just about the same (all squished). What am I doing wrong here.

February 23rd, 2003, 06:56 PM	#7
Guest Posts: n/a	<<<-- Originally posted by Rob Lohman : Did you shoot it at 16:9 by any chance?? Can you put up a still picture or e-mail me one? -->>> Yes, I'll email a picture. Thank you.

February 23rd, 2003, 08:18 PM	#8
Mike Rehmus Wrangler Join Date: May 2002 Location: Vallejo, California Posts: 4,049	If you want 1:1 aspect ratio footage, you are going to have to shoot withing a 1:1 ratio box and then crop the video to that ratio for your application. You cannot adjust the dimensions of the video in order to make 1:1. If you have a PD150 you can load a 1:1 mask into the memory stick and overlay that over your video. __________________ Mike Rehmus Hey, I can see the carrot at the end of the tunnel!

February 23rd, 2003, 09:09 PM	#9
Guest Posts: n/a	Uh Ha! So 360x240 IS the correct aspect ratio for encording streamable video over the internet played on computer, if the original footage is shot in DV (PD150 normal mode). No wonder anything I read made any sense. 720x480 3:2 ratio looks normal to me. So it only make sense to encode video in 360x240 which is also 3:2. Thank you, Anne the Ragady