Weird DVX-100 interlacing in 60i

Jarek Zabczynski

Jarek Zabczynski

Veteran
Hey guys. After having my DVX for what? Like 3 years now, I've run accross my first problem. I was doing a shoot that had to be in 60i. Actually I think this is the first time I ever shot 60i with this camera. But anyway when I reviewed my footage, I noticed this really weird interlacing thing, almost as if the fields would swap for a few seconds and then go back to normal. It would be on and off every 10 seconds or so. It would almost look kinda pixelated, but very fine pixels. This isn't what drop out looks like. It pretty hard to see in stills, I really don't think they would do any good. I did put together a 10 sec clip though.

http://www.jesterrecords.com/dvx60i.mov (save as) 35MB

The "weirdness" starts about a second into the clip and goes back to normal about 3/4 into the clip.

It's QT DV if anyone want to plop this into FCP to see it on a monitor.

Thanks,

Jarek


Are my heads clogged or something? I've never had this problem when shooting in progressive. I even shot a music video the following weekend in 24pa with no problems.

Any thoughts? Thanks.

Jarek
 
Dude, what did you compress that with. I can't tell a thing from that footage, it looks like your resolution is about 1/4 of what it should be. It also looks like it has been deinterlaced and and run through some kind of smart blur filter. Why don't you try posting a shorter clip, but at the full DV resolution.
 
Was this the DVX100 or 100a? It looks like focus bumped a bit in the clip. If it's the DVX100, autofocus is off for 24 fps but could be enabled when you switch to 60i. Perhaps it was on and you didn't know it since you normally shoot 24?
 
scharky said:
Dude, what did you compress that with. I can't tell a thing from that footage, it looks like your resolution is about 1/4 of what it should be. It also looks like it has been deinterlaced and and run through some kind of smart blur filter. Why don't you try posting a shorter clip, but at the full DV resolution.
Click to expand...

That is full res DV. No compression no filters. Basically right off tape. Are you looking at it with the Quicktime Player? If so you need to go into videotrack properties and enable high res playback. Otherwise yes, DV video in QT player runs at like half res or something stupid like that. I dunno why they do that.
 
Scottdvx100 said:
Was this the DVX100 or 100a? It looks like focus bumped a bit in the clip. If it's the DVX100, autofocus is off for 24 fps but could be enabled when you switch to 60i. Perhaps it was on and you didn't know it since you normally shoot 24?
Click to expand...

DVX-100. I wasnt the one shooting but I'm pretty sure autofocus was off. You really MUST see this on a broadcast monitor to see what I'm talking about. It's weird.
 
Hey JesterJJZ,
When I first got the camera I shot a commercial with low light also. I saw the exact thing in my footage when I got back to the studio. It's very subtle but it's definitely there. It also was present in a right to left pan too. If I remember correctly I had the OIS on while it was on a tripod. Funny thing it doesn't show when it gets to the air.
Gary
 
Hey JesterJJZ,
Are you saying that you found your problem? The situation I had only showed up in reds also.
Gary
 
Gary said:
Hey JesterJJZ,
Are you saying that you found your problem? The situation I had only showed up in reds also.
Gary
Click to expand...

Nope, it shows up on the entire screen. The image kinda gets pixelated and flickers slightly. It's not drop out.
 
If you look closely at the red dresses you should notice a very thin vertical line that appears as you pan. That's what I noticed. As the vertical lines cross certain objects they seem to pixalate. I shot a scene with a lot of red bows, poinsettias etc for a Christmas spot and noticed the same thing.
 
Yes, because interlaced video is processed/compressed in a different mode (2x4x8 transforms instead of 8x8 transforms for frame modes)
 
That's kinda strange andre, after I turned off the OIS it has never returned. I use a tripod almost all of the time so I guess it causes some kind of competition. I was about to send Jester a sample of what I meant.
Gary
 
andre said:
Yes, because interlaced video is processed/compressed in a different mode (2x4x8 transforms instead of 8x8 transforms for frame modes)
Click to expand...
Weird. Is that ony on the DVX? I've never seen that on an XL-1 or VX-2000
 
Yes That's what A Wilt writes, it's a DVX100/100A problem. Only visible in some colored areas. Chroma keying is a problem.
 
andre,
If you look at his sample it pulses as he (Wilt) explains the problem. If you look at JesterJZZ's sample there are very thin vertical lines that when he pans causes a distortion not pulsing. I can show you the exact problem in some early footage I shot. The vertical lines are from top to bottom and cause the distortion in the entire scene. It's easier to see in the reds.
 
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