Visual Racheting Clip

D

drdimento

Well-known member
Recently I tested the Panasonic DVC60 and DVX100 to determine which camera would be best for our application. The first thing I noticed in the output preview in Liquid Edition 6.0 from the clips shot with the DVX100 was a sort of racheting of the film clip when panning. The camera was mounted on a liquid head stand and the DVC60 did not do the same. At first we thought it was something to do with the DV output but after posting at LE's User Groups and several tests the result revealed that it wasn't the file because the DVC60 was set exactly the same as the 100 and its' results were fine.

Then upon running the tests again, we discovered that the same racheting when panning was apparent in the LCD viewer and thus the output was representative of the capture by the camera. Anyone have any idea what was wrong?

FYI, recently in NYC at the NAB conference a Chroma group had a 100 set up and it was racheting too.

Ideas?

Dr D :)
 
VIDEOMIKE, are you serious? is that all it could have been? if so, i could run back to the pro cam shop and retest but since it's an hour+ away (live in the bonies) i'd like to make sure. can't believe it would be something sooooo simple AND that the pro show in NYC would have theirs set up the same.

Dr D :)
 
VideoMike, I will check it out toward later part of the week. I have to tape 5 shows on Tuesday and going there all day tomorrow to arrange the set and pre-produce the shows so after tuesday i'll be able to get back on course with it.

btw, do u know if one can use a 100b on the scifi-fest? or is it dvx100/dvx100a only? right now i use dvc60 and am going to sell it, put some $$ with it and get the 100b.

Dr D :)
 
it's a SD 4:3 TV ministry show that airs on local and several small networks covering four states and one channel on sky angel satellite. they been on the air over 12 years and recently contracted us to do their show due to their experience with our commercials and training video movies. moreover, having completed extensive audio work for the radio broadcast folks, they felt we were capable of "communicating on a level playing field" with the media personnel. i guess their choice worked since we did work out all the encumberances and media requirments. i was very shocked to see how TV broadcast has changed. they used to be the STANDARD for benching ones abilities, not so any more. they litterally are going through an identity crisis - - they are recording and broadcasting in so many different variations that it's surprizing we actually get stations :)

what do you all do?

Dr D :)
 
Hi Dr. D
Video is a hobby for me. I teach a studio production class at Access Tucson community cable. Work on a couple of show. I'm making a movie with local actors but its amateurish. Did we solved the mystery of the racheting video?
 
Hi Video Mic

Hi Video Mic

Sounds like a really cool project. I haven't been to the pro cam shop yet to record another tape to test . . had to record 5 shows on tuesday and convert some songs from some earlier shows from 3/4" tape (whoa is this old footage). Hope to get to it next week BUT in the meantime we're having to put "Closed Captioning" on the shows we taped last week and that's a bugger :(

BTW, are you having the same difficulity?

What exactlly are you doning with ur shows? Using DVX's? Other? And are you dong Post or Live production? And if post, what editing software are you using?
 
DrD I believe the DVC60 is a 60i camera? The DVX can do 60i but can also do 30pa, 24pa and 24p. I think your "racheting" may be the result of panning too quickly in either 24pa pr 24p mode. For cameras using this function there is a min pan speed to avoid "strobing" which goes along the same rules that apply to film cameras shooting in 24fps. Retry your test using 60i on the dvx for comparison.
 
Hi Dr. D
I do live shows at Access Tucson. One is an interview show, sometimes political. I also do two political shows once a month, and a live call in show " The Loonie Bin". The movie project "Crimes of Convenance " was started with a PD150 because that's what the station provides, and my XL1 had died. I use an XL2 (I hope we can still be friends). It's a good camera, and I was accustomed to the form factor and was invested in the accessories and the wide angle lens. I like the 16:9 format and the CineGama curve. I haven't used 24p much, I shoot events. On My next Movie project will be 24p and 16:9
The studio uses Ikigamies. I use Premiere 6.1 to edit. It's not FCP, but it is more affordable and I can up grade my computer myself as opposed to having to replace an entire Mac

I think ncje may be more on target with his analysis of your situation.
 
ncje: i do believe that you've described exactly what the camera and footage illustrate "strobe like". i did try panning the camera very slow and the effect appeared the same. also, the LCD image and VF illustrated the same thing and so did the output DV material and when i first captured the clip recorded on the DVX100A with my DVC60 and Liquid Edition, i thought that the software was producing the issue. when we tried virtually everything with the software unsuccessfully and just happened to be at the NYC NAB Post show two weeks back their camera did the same thing, and thus i thought that it was the camera. i will be trying another test shortly (hopefully this week, although i have to work on CC for our 5 programs we just recorded and they air in January and the new law says that ALL programs aired have to have CC unless one has received and EXEMPTION) and thus will know better after the test. i'm also going to test the cam WITHOUT stabilzation cause that may also be the prob?

VIDEOMIKE: cool to hear of all that experience. sounds like your feet are in the door and "no problem" with the FCP/Mac issue, i too don't like the Apple/Mac arrangement because of all the hardware and software limitations and thus we use either Liquid Edition or Avid Express Pro HD for PC (although we don't do any HD or HDV at the moment, we are planning to when our present client wants to make a movie next year).

TO ALL: will try to get the 100A back in our hands later this week and make sure the cam is set to 30/60 without progressive scan AND will make sure the image stabilzation is OFF and post the results :)

Thanks to all for the continued help and hoping we can get this issue resolved because we want to either get a DVX100A or B (latter preferred) and if our client will help perhaps even the HVX for HD :)
 
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