HDV is captured in 1440x1080?

[Manuel]

Hi,

25p (PAL) HDV footage is captured as 1440x1080. Why not 1920x1080? What am I doing wrong?

This is both in Vegas 7d and with HDsplit.

Thanks,

Manuel

[Mal]

That's the HDV standard: 1440x1080; don't blame the cam, blame the HDV standard.

You can get 1920x1080 out of the cam though (which is nice of Canon to do), but you'd have to go via HDMI. Maybe use something like the Blackmagic Design's INTENSITY card: http://www.blackmagic-design.com/products/intensity/

[kosmar]

Hi,
Check this out:
http://www.adobeforums.com/cgi-bin/webx/.3bc3db62

"The HV 20 sees 1920x1080 resolution, which is then translated by the DSP into 1440x1080 ... since the HV 20 has the HDMI logic placed after the DSP, the exported 'live' resolution is limited to only 1440x1080, thus the lower 125 MB/s transfer rates, instead of the indicated 200 MB/s."
DSP (digital signal processing).

So even if you use a Blackmagic card you don't get real 1080p. Is this right ?

[Ian-T]

Not quite. For live recording through the HDMI you get the full 1980x1080 resolution. The only reason the cam even pushes out 1440x1080 is because that is HDV standard...therefore going to tape it has to be that size. But for live feed through HDMI it is mostly untouched off the sensor. I have seen Harm's chart before..I believe the chart even shows that.

Now that I am seeing it again I think the chart is inaccurate. He's going in the right direction but I think he should remove shooting in HDV from the top and also remove it from the first block on the top right because 1980x1080 is definately not HDV..it is full raster HD. Down below shows after recording on tape which is correct in its representation (HDV standard 1440x1080). Not to discount what he is attempting here but it's a little off.

The bottom line is...HDMI "live" output is 1980x1080.
If you record on tape first and still used the HDMI then all that does is blow the picture back up to 1980x1080 from 1440x1080...and this is the point I believe Harm is trying to make...might as well use firewire if you are going to use it this way (you could always blow it up in post). The real benefit from using HDMI is in "live" recording...not recording to tape first.

[bluegrass]

I read a review in my new DV magazine that has made me skeptical as to whether capturing 1920 X 1080 via HDMI is really worth the cost and effort to do it, especially with a low end HD camcorder such as the "twenty". I'm not downing it now, I love it, but to be honest, how can it compete with the optics in a professional level camcorder. This artical leads me to believe that an observer will probably not notice that big of a difference in HDV and whatever you want to call 1920.

Incidentally, the article did clear up one thing that had been bothering me for awhile. There is a difference in the quality of component video and HDMI video. Component is of a lower quality according to this article. I had read several posts and came away with the understanding that they were equal even though componet is analog and HDMI is digital.

For those of you interested in the article, you can see it at the following link:
http://www.dv.com/reviews/reviews_item.php?articleId=196603088

[Mal]

It would be the 4:2:2 color space that would be more benefitial than the resolution; if you can get 4:2:2 out of HDMI...

[Ian-T]

Not in practical use maybe. But there are circumstances where it is worth it. Mostly in keying or working in green screen. For some (especially vs HDV compression) they can definately see a difference. I guess the trouble will depend on the individual (how badly they want it). For the general user it is probably not worth the trouble. For me...I'm just glad the option is there. In regards to component and HDMI agin the difference is anaolog vs digital. Looking at the same signal through HDMI and component..the HDMI is purley digital and is of a higher quality everytime. Is it perceivably better...not necessarily...but I would think if you are going to blow it up on the big screen you will definately start to see the difference.

[Ian-T]

It would be the 4:2:2 color space that would be more benefitial than the resolution; if you can get 4:2:2 out of HDMI...
Yes...this is where you will benefit for keying etc.