View Full Version : General HD question related to XHA1.


Neil G. Randall
April 6th, 2009, 12:10 PM
Forgive me if I'm being a divvie, but I've only just got the A1, which is my first foray into HD videography. Point is, I'm a little bemused by the pictures I'm getting back.

First, I've set up the camera on the Panalook preset in HD, and shot manually, using the AF override button whenever necessary. Then I tried shooting using the Auto setting (not fully-auto, though) to see if the camera can achieve a more-critical focus. The gain is -3dB for both, full wide, exterior, with bright sunshine, then overcast, but still very bright.

What I've got back is underwhelming. Admittedly, I've only just dumped it into Vegas but, to my eyes, it appears no better than the old SD Panny GS320 handycam we were using. If I run the preview window at full size, at best quality, the footage is grainy, flat and soft.

This is what I think's wrong: my perceptions. It's twofold: first, my experience of HD is HD-DVD and Blu-Ray. I appreciate there are a million miles between my paltry efforts and the latest blockbuster, but I was kinda hoping the A1 rushes would sing a little more.

Next, I believe this disappointment is compounded by a resolution/size relationship: am I right in saying a HD picture is no better quality than SD, but simply larger, akin to megapixel count on an SLR camera? My belief is that the benefit of HD becomes obvious when viewed on a HD monitor/TV, next to a SD monitor of the same size. By previewing at fullsize, all I'm doing is getting a bigger picture, as I'm using the same montor at the same resolution.

However - and despite my poor interpretation - I'm still at a loss to explain the soft, grainy footage. I would have expected a £3K HD camera to kick the arse of a £400 SD handycam, even out the box.

Disappointingly, I will have to o/p to SD anyway, but could anyone here offer some advice on either adjusting my mental approach to shooting HD, or else offer guidance on how to best set the camera up/NLE, please? (I appreciate the former's an almost-impossible request, but all input is appreciated).

PS - apologies for the lengthy post.

Ta,

NR.

Howard Churgin
April 6th, 2009, 01:30 PM
Your experience with your picture quality leads me to think that something is wrong...

1: are you sure your recording and capturing in HD
2: are you sure you're not downconverting to SD from the camera while capturing?

The video quality even on your monitor should be much better than SD.

What NLE are you using? Does it do HD?

Bill Pryor
April 6th, 2009, 01:33 PM
First of all, it's not the camera and it's not HD. The camera looks great and HD looks great. No doubt you watched many of those clips that are in this group as well as elsewhere, so you should know what the camera does and what HD does. Your problem could be a combination of factors. You could be shooting on auto gain. First thing to do is go through the manual and turn off all the auto stuff--like the auto iris, auto gain, auto white balance, auto shutter. Check your recording mode and make sure you are indeed shooting HD, make sure your shutter speed is proper (1/50 for PAL, I think).

From the graininess you describe my first guess is that you're on auto gain, maybe shooting with an ND on, so it's going into auto gain all the time. Secondly, I don't know what capture settings you're using. Somebody who knows Vegas will have to check you out on that, but it could be another problem.

So don't be disheartened. It will look great once you get everything set up right.

Neil G. Randall
April 6th, 2009, 03:29 PM
Ok, thanks guys - now I'm thinking my suspicions aren't so out-of-whack!

The camera has been set to HDV/Frame mode/Panalook Preset, since I got it out the box.

For the auto settings, obviously a lot of stuff is on, so I accept AGC and other crap is contributing to a crud picture. That said, it was overcast/ext, and very bright, so God knows why there was any need for gain compensation.

When I shot manual, I turned off the AGC, and used ful manual controls It was sunny/ext stuff with full manual control apart from focus, which I left to auto.

As for the NLE, it's Vegas Pro 8. I set up a new file as HD, but can't be certain exactly what dimensions, as it's at work. Perhaps it IS downconverting.

Problem is, I'm a one-man film crew who's got to teach at the same time, so I ain't exactly got the latitude to thoroughly test the camera. I assumed I could shoot, transfer and edit. Now I'm thinking I need to make time for proper tests...

Again, thanks - keep those ideas coming!

Ta

NR.

Battle Vaughan
April 6th, 2009, 04:09 PM
Here's a contrarian possibility: Put the camera back to factory-new. No presets and other things that might skew the results. Establish a base-line idea of what the camera does all by itself-- put it on A-mode, agc on, auto white balance on, auto focus on, and let it show you what it does before you change up settings that you might regret...just to see if maybe you changed something that's messing you up. Just plain good old 1080 60i, or in your case, probably, 50i.

And be sure your NLE project is set for HDV capture. I don't know Vegas, but in FCP and Premiere, if you set your timeline up for SD (and it sounds as if you have been working in SD up to now) the program will happily take your HDV and make SD out of it, even if it protests doing so. I"ve worked with the XHA1 for over three years now and there is a HUGE difference in the resolution and detail between what I see on a 24 inch monitor between HDV and SD modes. The camera is a good one, something else is wrong, I believe. My two centavos..... /Battle Vaughan /miamiherald.com video team

Let me hasten to add that I defer to Bill, who knows his stuff. I refer to my own experience in "customizing" a new piece of equipment before I really understood what I was about; thus my suggestion that you start out with plain-vanilla, just to see...

Neil G. Randall
April 6th, 2009, 04:26 PM
Ok, that's a worthy idea. I'll reset it and chuck it on full auto to see what it does. As an aside, I had put it straight on 25p (Frame Mode), so I'll try 50i as native HDV.

As for Vegas, I remember reading that its project settings are entirely independent of the capture process - apparently, it imports as the same format/resolution as the rushes. I'm getting .m2t files, the raw HDV stream (again, apparently).

Thanks for the advice, mate.

EDIT: Ack! I forgot to write I was shooting at a 250 shutter speed when it was sunny - needed a freeze-frame on a pratfall. Shouldn't affect sharpness, should it?

Also, I watched the Vimeo flick of a bunch of presets and noticed some were very soft - unusuably so, IMO.

Battle Vaughan
April 6th, 2009, 04:54 PM
Hi, try the "A" setting, not the dimbulb green-box full-auto setting, and good luck! I'm trying herewith to upload two frame grabs which might be illustrative --- the original hdv capture frame and the ntsc (720x480) result from Final Cut exporting sd from hdv....I have not had good fortune attaching largish files, even though they are smaller than the allowable size, so apologies in advance if it doesn't work....but I wanted to illustrate what I see when I shoot HDV....here goes... / bvaughan

Andy Wong
April 6th, 2009, 05:02 PM
Hi Neil. Why don't you post some piccies up for us to assess?

Neil G. Randall
April 6th, 2009, 05:05 PM
Wotcha - Yeah, I used the camera on that setting, so will give it another crack, although I feel I should be using full manual!

Also, your frame grabs are fine, naturally, the SD one is a quarter the size of the original, so it's hard to compare them. I undertand what you're getting at, though.

PS - my output MPEG2 plays as a much-larger size in WMP - in fact, it exceeds the size of the monitor.

Thanks again,

NR.

Hi, try the "A" setting, not the dimbulb green-box full-auto setting, and good luck! I'm trying herewith to upload two frame grabs which might be illustrative --- the original hdv capture frame and the ntsc (720x480) result from Final Cut exporting sd from hdv....I have not had good fortune attaching largish files, even though they are smaller than the allowable size, so apologies in advance if it doesn't work....but I wanted to illustrate what I see when I shoot HDV....here goes... / bvaughan

Neil G. Randall
April 6th, 2009, 05:07 PM
Hi Neil. Why don't you post some piccies up for us to assess?

Ok, I'll get some grabs tomorrow. You must promise not to point and laugh at my crappy cinemat- sorry, videography!

Right, it's tomorrow here in the UK. I'll get some screens up and perhaps we'll find out if it's user error or not.

Night.

NR.

Bill Pryor
April 6th, 2009, 06:18 PM
If there was no high gain happening, then that seems to me to point to your capture settings, assuming you're not in a downconvert mode. Is everything coming in in a 16:9 timeline with no rendering required? There's got to be somebody on here who knows something about Vegas.

Lorinda Norton
April 6th, 2009, 07:15 PM
I'll be a little surprised if the capture settings are the problem because I couldn't capture a thing in Vegas until I got my settings right. But here goes:

In the capture tab, top left corner, there's a drop down box that includes the word "Prefs". From the drop down > Device > IEEE 1394/MPEG2-TS Device.

From my experience with it, that's the only way you can capture from the XH A1 if the footage was shot in HDV.

Neil G. Randall
April 7th, 2009, 03:59 AM
Here are some screens.

Image 0 is auto (the 'A', not the green box).

Images 1, 2 & 3 are manual with auto focus, HDV, 25P, 250 shutter, no AGC, -3dB, Panalook preset.

There is no postproduction.

Once you've clicked on an image, you can click again to see it full-size.

ScreenHunter_01 Apr. 07 10.37.jpg is the Vegas project settings.

Like I said, it could just be shoddy workmanship, so feel to let me have it!

Ta,

NR.

PS - forgive the chavvie costume. He's playing a chav.

Neil G. Randall
April 7th, 2009, 04:53 AM
Here are some grabs of footage shot on HDV, 50i, Auto, no custom presets, raw from Vegas.

Andy Wong
April 7th, 2009, 05:05 AM
They look fine to me, but I'll leave it up to the experts to comment.

Lines look a little jaggedy, but I think that's down to the compression of the stills. What I do see are chromatic abberations, particular around highlight areas. This does make the images appear "soft" as you describe. But I think this is down the limitations of sensors around the prosumer range. This is where skilled/controlled lighting become an important element in your production.

Neil G. Randall
April 7th, 2009, 05:15 AM
Thanks.

Yeah, I realise the A1 ain't no CineAlta (or Red even) and that the shots are unlit, so I don't expect production quality. My thinking was just that it was soft and flat.

Am continuing to test. Think I'll try the EOSLOOK preset on some flowers in sun - usually works when testing an SLR.

Ta,

NR.

They look fine to me, but I'll leave it up to the experts to comment.

Lines look a little jaggedy, but I think that's down to the compression of the stills. What I do see are chromatic abberations, particular around highlight areas. This does make the images appear "soft" as you describe. But I think this is down the limitations of sensors around the prosumer range. This is where skilled/controlled lighting become an important element in your production.

Battle Vaughan
April 7th, 2009, 02:19 PM
I know zip about Vegas workflow, so excuse me if I'm off base here --- questions about the setup window: You are shooting 1080-interlaced but the setup is progressive, no deinterlacing...I don't know how Vegas handles that but it sounds counter-intuitive...you have 8 bit pixels, which for all I know is the standard, but does it make a difference if it's 16-bit, say? You have a Gaussian motion blur selected, does this affect your rendering? And the "good" rendering sounds like it may be a lesser quality choice than might be available. Again, faik, this is the way Vegas is supposed to work, I'm just fishing for ideas here...
Re the samples I sent,
I would re-send my sd sample same size as the hdv but up-rezing in Photoshop just adds blurry pixels and would be misleading...suffice to say the res from the 1920x1080 looks WAY better than the 720x480 on the screen here....but (except for the dog clip, which looks a lot like SD) you obviously are in HDV mode... the eyeball photo looks very sharp here, thinking what you see looks a little mushy due to possibly a low contrast setting of some sort in the camera or Vegas, or some combination of the workflow setup giving you the same effect...my guess, I may be completely wrong....best wishes! /Battle Vaughan

Steve Sobodos
April 7th, 2009, 04:12 PM
I may be way off base but one thing I have had happen in outdoor taping - don't forget to keep the iris in the middle of the range. The camera doesn't tell you when it would be appropriate to add neutral density, it just closes the IRIS to the point that sharpness starts to suffer.

Just a thought . . .

Garrett Low
April 7th, 2009, 05:12 PM
Neil, set your full rendering quality to best and see if that changes the picture. If all you're doing in Vegas is screen capture via the app that setting will affect the quality. You should try rendering a short clip out and see if that is what you're expecting.



Garrett.

Neil G. Randall
April 10th, 2009, 06:22 AM
Weird - my notifications stopped!

Dunno if the NTSC version is different, but ours starts bleating on the display that it wants ND whenever it's too bright. Or am I confusing it with something else?

However, when you say 'in the middle of the range' are you talking about a theoretical sweet spot around f3.5-4.5? I always try to open up as much as possible to a) allow as much light in (avoiding grain), and b) give as shallow a DoF as the cam will allow. I use the NDs if necessary/if the camera asks.

Is there a range where sharpness/exposure is at the optimum setting? A kind of unity gain?

Thanks.

NR.

I may be way off base but one thing I have had happen in outdoor taping - don't forget to keep the iris in the middle of the range. The camera doesn't tell you when it would be appropriate to add neutral density, it just closes the IRIS to the point that sharpness starts to suffer.

Just a thought . . .

Neil G. Randall
April 10th, 2009, 06:30 AM
Do you mean the rendering quality or the quality of the video in the preview window? For these screens, I've set the preview to Best/Full, but the rendering is Good, because I seem to remember reading about it only really being worth it for 10-Bit video - which I didn't think the A1 is. Sorry if I've got it wrong!

The other thing that strikes is whether the pixel format is correct (8-Bit). I set it to 32-Bit, floating point, and the PC ground to a halt. That's evidence enough for me!

I did shoot out a clip but it's too big for the monitor (pointless viewing at half/quarter size). I've nothing to view on HD, as we're not set up with burners/repro where I work.

I've got some new footage which looks a bit better, I think, so I'll get some more grabs up on Tue/Wed.

Thanks again,

NR.

Neil, set your full rendering quality to best and see if that changes the picture. If all you're doing in Vegas is screen capture via the app that setting will affect the quality. You should try rendering a short clip out and see if that is what you're expecting.



Garrett.

Martin van der Poel
May 2nd, 2009, 10:43 PM
Hi Neil,
I upgraded from a GS400 to a XH A1s recently.
The picture of the XH A1s is much better than the GS400 especially in lower light conditions.
I notice that you are using the panalook preset, try it without any preset, as the preset might be wrong in some of the less obvious settings (I have done it and the picture looked black and white, instead of what I had in mind).
The picture of the XH A1s looks a bit flat in its standard form, but as it has not been manipulated is a better guide to what the camera can do.
In vegas make sue that the project settings match the clips, if in doubt go to the properties of the project and manually set the setting to match one of the M2T clips on your hard drive.
Regards,
Martin

Bryce Comer
May 3rd, 2009, 02:22 PM
Hi Neil,
At what focal lengths are you shooting? Are you trying to achieve a shallow depth of field in most of your shots? If so, it may well be worth considering the limitations of using a 1/3" camera. If most of the stuff you are shooting is on the wide end of the zoom range, then even though you are using larger apeture settings you will still get a pretty large depth of field. I would try to move the camera further away & zoom in more, framing the shot as you would at the wider end of the zoom but obviously from further away. You can then keep the aperture settings around the 3.5-4.5 where the picture will be at its sharpest, but give you the same or shallower depth of field as if you were at a larger aperture on a wide zoom setting. Use your focus assist aids to help get the focus spot on, on your subject. You can also manipulate your exposure by adjusting the frame rate to get exactly the f-stop you are after. If you are shooting in Manual mode, you shouldn't see the ND filter flashing in the screen when it is needed, as in the manual mode the camera presumes you already know when you want to use it, so won't give you the hint that it's needed.
Looking at your frame grabs, the sky looks pretty overcast & dull. That's great if you want nice even lighting, but you won't get good contrast in your shots. It also looks like the sun was pretty high in the sky, so that wouldn't help either creating very flat images with very little depth. Try to do your shooting earlier in the morning or late in the afternoon when the light is much nicer. There was also not too much in the way of colourful things in any of the shots, so i would expect the shots to look a little bland.
Try also to use manual focus if you can, it will give you way more control over what is & what isn't in focus. If you can't get a shallow depth of field due to lighting or space limitations, using auto focus may well have the camera focused on the background rather than on your subject. This may only be a slight difference in focal length, but may well have the subject in your shot looking soft.
Not sure i see too much in the way of grain in your frame grabs, so i won't comment on that.
Hope this gives you some stuff to play with & hopefully give you something more like what you are trying to achieve.
Regards,
Bryce