Help with 24pA DVD.

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Guest
for some reason my 24pA footage is coming out very chunky/pixely in some areas. see still from vegas below..

Image0.jpg


my regular 24p footage doesnt normally look like this. i edited the footage and exported it to dvd using the 24p dvd architect template with 2-3 pulldown applied. can someone help me fix this problem? Thanks!
 
Re: Help with 24pA DVD.

whether the footage is 24pa or 24pn has absolutely no difference at all. the stairstepping pattern your seeing is from the dv codec your using. try using a differnt codec that does chroma smoothing or interpolating, and youll probably get better results. of course it could also be the codec your using to output the still. its hard to say if the actusll video codec used has the same issue because we havent seen any video.
 
Re: Help with 24pA DVD.

How would i go about using a diff dv codec? which one do you recommend. thanks.
 
Re: Help with 24pA DVD.

when you select your output, or rendering codec in the project proerties. i personally reccommend the matrox codec which can select to use chroma smoothing or interpolation individually on or off, but otherwise i would use the avid codec for a single generation render, .. although the vegas codec is supposed to be good... ive never used it though.
 
Re: Help with 24pA DVD.

Just installed matrox codec. it doesnt support pulldowns... so what do i do with this 24pa footage?
 
Re: Help with 24pA DVD.

you mean it wont render at 24fps.. bah.. i should have rememberd that. oh well it a good one to have anyway.. use the avid codec. you can get it by installing avid free dv.  did you try the vegas codec yet?  that looks like a very troublesome area, cause of the contrast, and the angle of the fixture. it going to be hard for a codec that dosent smoooth to render it without the stairstepping. espescially the apple codec. you may be stuck with it unless you go uncompressed. or find a decent codec for it, i would guesss the avid would be ok -- what is your destination output though? if your going to dvd then dont worry about how the dv codec handles it, instead just go oof your mpg encoder quality. if your final output from the nle is dv tape, then you need to woory about the dv codec
 
Re: Help with 24pA DVD.

im going to dvd with it. i tried making a dvd of it already with the default vegas mpg codec and i had stairstepping on the dvd. whats a mpg codec that would get rid of this problem?
 
Re: Help with 24pA DVD.

Not sure, but could this also be a thin/thick (line detail) issue?
 
Re: Help with 24pA DVD.

Good question.. What does the thick/thin really do. I played with the two looking at a close up shot of box with letters all on it, and really could'nt see any difference. Of couse I was looking at the LCD screen and not through a monitor.
 
Re: Help with 24pA DVD.

You probably won't see any difference on the LCD screen, since the LCD shows (I believe) only one field at a time. Take some test shots and play it back on your computer and you'll see a huge difference.

THICK blends the fields together a bit, to thicken up horizontal lines so that they don't ever appear strictly in one field (which would make them flicker on a television, showing up on one field but disappearing on the next, etc). All interlaced cameras employ this same blur filter, and in THICK mode the highest resolution you'll get is about 360 lines.

THIN mode turns off the filter, letting the raw data get resolved at the maximum possible resolution. You can get a full 480 lines of vertical resolution in this mode, 33% higher than a PD170 could do. It'll look phenomenal on a film transfer, a computer monitor, an LCD or Plasma TV, or other progressive display. But, it may look lousy on an interlaced television, flickering and twittering like mad. THIN is not designed for use with televisions, that's what THICK is for.
 
Re: Help with 24pA DVD.

Barry - what about compressing your THIN shot material down to MPEG-2 for a DVD. Does it still cause filckering when the DVD is shown on NTSC TV's?
 
Re: Help with 24pA DVD.

That, right there, is a good question, and one I don't know the answer to offhand. My guess is that yes, it will flicker and twitter on thin-line stuff.

You can correct for that in your editing program by choosing "de-flicker" or "reduce flicker" or whatever your editor calls it. That involves doing the between-field blend just like as is done in-camera in THIN mode.

The thing is, not everything flickers and twitters. I've shot lots of stuff in 24PA/THIN and played it on a TV and you never notice any problem. It only really becomes problematic on thin line detail.
 
Re: Help with 24pA DVD.

alternative is to crop for 16:9 and get rid of the lights in the frame. If you're okay with masking...

mike
 
You must log in or register to reply here.
Back
Top