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  #1  
Old 12-25-2007, 11:50 AM
Mark Williams Mark Williams is offline
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HDV to SD Output

I am seriously considering this camera but my NLE will not support HDV editing right now. I've heard this cam also shoots great SD but is there anything to be gained by shooting in HDV and outputing thru the cam in SD vs. just shooting in SD to begin with? Will the downconversion thru the cam look better?

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Mark
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  #2  
Old 12-25-2007, 09:33 PM
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vsansal vsansal is offline
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Quote:
Originally Posted by Mark Williams
I am seriously considering this camera but my NLE will not support HDV editing right now. I've heard this cam also shoots great SD but is there anything to be gained by shooting in HDV and outputing thru the cam in SD vs. just shooting in SD to begin with? Will the downconversion thru the cam look better?

Thanks,
Mark
www.natureflixs.com


Starting with higher resolutions and then downconverting creates better results than recording low resolution in the first place. You can see this when you watch Hollywood DVDs. Even if they have 720x480 resolution, they still look great compared to a video recorded by an SD camcorder. This is because when you record HD you will have more information to start with. Also another big reason why recording HDV is better than SD is you can keep your tapes and you can convert all of your videos to HD in the future.
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  #3  
Old 12-26-2007, 06:01 AM
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Blairness Blairness is offline
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Quote:
Originally Posted by vsansal
Starting with higher resolutions and then downconverting creates better results than recording low resolution in the first place. You can see this when you watch Hollywood DVDs. Even if they have 720x480 resolution, they still look great compared to a video recorded by an SD camcorder. This is because when you record HD you will have more information to start with.
That's disputable, however in this case that doesn't matter because:
Quote:
Originally Posted by vsansal
recording HDV is better than SD [because] you can keep your tapes and you can convert all of your videos to HD in the future.
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Last edited by Blairness : 12-26-2007 at 06:03 AM.
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  #4  
Old 12-27-2007, 11:45 PM
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vsansal vsansal is offline
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Quote:
Originally Posted by Blairness
That's disputable, however in this case that doesn't matter because:

I found this true because down converting and recording low resolution are two different thing. You can check this with a digital camcorder. Take a low resolution and high resolution photo. Down convert the high resolution photo to the same resolution as your low resolution photo. Then blow them up. You will see that even if they have the same resolution, the picture taken using high resolution mode will hold up better than the low resolution photo.
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Last edited by vsansal : 12-28-2007 at 01:53 AM.
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  #5  
Old 12-29-2007, 04:53 AM
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Blairness Blairness is offline
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Quote:
Originally Posted by vsansal
I found this true because down converting and recording low resolution are two different thing. You can check this with a digital camcorder. Take a low resolution and high resolution photo. Down convert the high resolution photo to the same resolution as your low resolution photo. Then blow them up. You will see that even if they have the same resolution, the picture taken using high resolution mode will hold up better than the low resolution photo.

Down converting and recording low resolution aren't different things, because to record low resolution the camera has to down convert (how else can it get 1440X1080 from the CCD's down to 720X576/720X480? for the recording?). I wonder whether the differences in your example come about due to different quality down converters (in camera vs. in editing software)?

So going back to the case at hand... Because all the down converting would be done in-camera either:
#1 before the initial recording ('record in SD' option) or
#2 while playing back the tape ('record in HDV then down convert' option)
I can't see how you would get a better result from either over the other (infact, because of the HDV compression, the 'record in HDV' option would probably end up worse). Hmmm, maybe someone could do some tests (which option if either produces the best image) using the A1

In any case, I think we are proving that as I said, this is a disputable matter... But also, as I said, in this case it doesn't matter because there is another definate benefit of recording in HDV, and as far as I can see, no major problems (just the HDV compression).
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  #6  
Old 12-29-2007, 09:12 AM
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vsansal vsansal is offline
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Quote:
Originally Posted by Blairness
Down converting and recording low resolution aren't different things, because to record low resolution the camera has to down convert (how else can it get 1440X1080 from the CCD's down to 720X576/720X480? for the recording?). I wonder whether the differences in your example come about due to different quality down converters (in camera vs. in editing software)?

So going back to the case at hand... Because all the down converting would be done in-camera either:
#1 before the initial recording ('record in SD' option) or
#2 while playing back the tape ('record in HDV then down convert' option)
I can't see how you would get a better result from either over the other (infact, because of the HDV compression, the 'record in HDV' option would probably end up worse). Hmmm, maybe someone could do some tests (which option if either produces the best image) using the A1

In any case, I think we are proving that as I said, this is a disputable matter... But also, as I said, in this case it doesn't matter because there is another definate benefit of recording in HDV, and as far as I can see, no major problems (just the HDV compression).


I agree this is a disputable matter but I don't agree the camcorder is down converting while recording SD. It doesn't need to downconvert. It has more than enough effective pixels to fill out the 720x480 frame. It just records SD. It has the capability of recording SD using DV compression. It doesn't downconvert. So you lose information while recording. You cannot reverse this. If you record HD then downconvert, since you have more information in the first place to start with, it preserves more information even if they have the same resolution.
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  #7  
Old 12-29-2007, 10:27 AM
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poncho poncho is offline
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I am not going to dig up all the references. Here is one which spot has been saying for over a year, maybe two years and has provided samples:
Quote:
http://forums.creativecow.net/thread/24/875758#875758
Name: DSE/Spot
Date: Dec 7, 2007 at 11:53:22 pm
Subject: Re: A Question for DSE


I can't imagine anyone purchasing an SD camcorder these days, period. HD authoring not withstanding, the image derived from an HD source downconverted to SD is still significantly better than any SD camcorder can offer.

The HVX200 isn't the camera I'd recommend either. Smallest imager, smallest recorded image, and noisiest camera of the lot you mention. Not to mention the not-so-optimal workflow of P2 and Vegas.
My list would probably run like:

Canon A1-
Sony V1=
XL2
HVX200

Would love to return to toronto if the film school would like to bring me back. Currently on an Israel, Turkey, Singapore, Malaysia tour for HD Production and Vegas. When it's warm in Toronto, I'd love to be back there, too. :-)

Douglas Spotted Eagle
VASST

Certified Sony Vegas Trainer
Aerial Camera/Instructor


There are others if you really need them. Go to hv20.com, there are several samples and comments from several different people.

One other advantage which is also commonly overlooked is the ability to pan and crop HD and resample to SD with no loss or minimal loss of video quality.



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  #8  
Old 12-29-2007, 03:14 PM
jockey jockey is offline
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Quote:
Originally Posted by Blairness
Down converting and recording low resolution aren't different things
Downconverting 4:2:0 HD into 4:2:0 SD works better than converting 4:1:1 SD into 4:2:0 SD.
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  #9  
Old 12-30-2007, 03:48 AM
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Blairness Blairness is offline
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Quote:
Originally Posted by jockey
Downconverting 4:2:0 HD into 4:2:0 SD works better than converting 4:1:1 SD into 4:2:0 SD.
Could you please explain the context you are reffering to for when these conversions take place? Thanks
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  #10  
Old 12-30-2007, 05:58 AM
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Blairness Blairness is offline
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Quote:
Originally Posted by poncho
One other advantage which is also commonly overlooked is the ability to pan and crop HD and resample to SD with no loss or minimal loss of video quality.
Yip, another good reason to record in HDV (though you wouldn't be able to do that until you had HDV compatible software).
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