How do i know if my source is Interlaced?

[Cloud101]

Name of Topic. Thanks

[thecoalman]

It will have horizontal lines going through it, especially where there's motion. Just about every source is interlaced including VHS,hi-8,D-8 most mini-DV unless you have cam that shoots progressive mode.

They will look like the singer to the left.

[dphirschler]

Sometimes you can tell just by using your head. For instance, if it is a live event such as sports, news, or sometimes even a live concert broadcast, it will be video (interlaced). Movies, cartoons, and many TV shows are film (progressive). However, if it is being broadcast on NTSC television, then it will be interlaced using 3:2 pulldown.

If it is HDTV, then I don't know. I think HD can actually shoot live in progressive mode (even 60fps).


Darryl

[lordsmurf]

Movies, cartoons, and many TV shows are film (progressive). However, if it is being broadcast on NTSC television, then it will be interlaced using 3:2 pulldown.

No. No no no no no.
It is so far into an interlaced domain that there is no going back.

Use GSPOT to analyze the source.
If you want to "use your head" then look for comb lines like coalman showed.

[dphirschler]

All I am saying is that oftentimes you can have a good idea without even playing the video. Of course you will never know for sure unless you play it back and analyze it.


Darryl

[bodybuilders1]

what if i record somthing from ntsc tv and it is interlaced, can i then deinterlace this, and would it possibly be by using deinterlace with 3:2 pulldown?

[jimmalenko]

The general rule of thumb is only deinterlace if you are going to watch on a PC without "on-the-fly" deinterlacing software such as PowerDVD and WinDVD, to name but two.

More info:
http://www.digitalfaq.com/capture/interlace.htm

[junkmalle]

what if i record somthing from ntsc tv and it is interlaced, can i then deinterlace this, and would it possibly be by using deinterlace with 3:2 pulldown?

I inverse telecine movies from TV all the time. And yes, you can burn them to DVD marked for 3:2 pulldown. You have to capture with very few or no dropped frames for it to work well though.

[vhelp]

This is always confusing to most peoples, and they still refer to it
as Interlace

First, whenever your source is from TV, its either going to be one
of the following:

* Interlaced - all frames (TV news; sports; soaps; concerts)

* Movie/Film A - 3:2 Pulldown/Telecine (TV Movie; HBO; some TV specials)
.. these are sources that were shot w/ 24fps and Telecined to 29.970 fps
.. threw the an 3:2 pattern system.

* Movie/Film B - 3:2 Pulldown/Telecine (TV Movie; HBO; some TV specials)
.. these are sources that were shot w/ 24fps and Telecined to 29.970 fps
.. threw the an 3:2 pattern system. However, most tv programs of any
.. sort, will be (or screwy/badly done, etc) and not allways
.. follow the 3:2 Pattern precisely. These sources are almost never
.. recoverable, and a blend of some sort is used durint an IVTC process.

Almost nothing else will ever be full Progressive, unless they are TV
Commercials (There are a number of them starting to show up) but you'll
never see a Progressive Movie or TV Show - ever. (It would be like handing
you the Reals) Anyways.

If takes a good eye (as well as time learn't in quick determination of
what a given source is (Interlace; Film; etc) w/out resorting to complex
steps to determine what the source is.

When your end goal is to view on a PC monitor, you have to know how to
determine what the source type is (see the above three steps) and first
determine if it's Interlace or Film or Film (B) to decide what is
the best approach.
.
.. you cant' just go and see that it looks Interlace, and decide that
.. you need to perfome a De-Interlace on it, because then you'll be
.. short-changing yourslef in the end, w/ poorer quality.
.
If the source was Film, and you determined that it was a non-corrupt
Telecine, (3:2 pattern) you could incorporate an IVTC in the encoding
and be able to produce very good quality for PC playing.. and all in
Progressive frames.
.
But what if the source was Interlace. Then you would have to determine
the best de-Interlace process for your source. But that's only if you
determined that it was Interlace (ever frame) Just because you see a
few frames Interlaced, doesn't mean that the source is Interlaced.
It means that the source went through a Telecine process, and in the
end, you have a 3:2 pattern throughout your captured source. This so
called pattern is:

---> II PPP; II PPP; II PPP ...

that's Interlace Interlace Progressive Progressive Progressive ...
and w/out any broken patterns.

If you were capturing a New event or Sports events, or even Soap Operas,
you can bet it is all Interlace. Every frame is interlace.

-vhelp 3030

[sacajaweeda]

If it's interlaced, leave it interlaced.

[dphirschler]

Just to confuse things more... I once encountered a progressive PAL over NTSC. In other words, it was 25 fps progressive broadcast over NTSC television. So the pattern was PPPIII or PPPPII. I managed to recover the progressive content, but it was 25 fps. So I made a PAL SVCD.


Darryl

[lordsmurf]

, it was 25 fps progressive broadcast over NTSC television.

No. Not possible.

[junkmalle]

, it was 25 fps progressive broadcast over NTSC television.

No. Not possible.

What he means is that a progressive PAL source was telecined to 29.97 fps for NTSC TV. This is no different than taking 24 fps film and performing a 3:2 pulldown -- except the telecine pattern is different (2:2:3:2:3). I've seen this too and have successfully inverse telecined such content using the manual settings in Tmpgenc.

[vhelp]

My turn. No No No No No.

Almost nothing else will ever be full Progressive, unless they are TV
Commercials (There are a number of them starting to show up) but you'll
never see a Progressive Movies or TV Shows on TV - ever..

What I ment w/ that statement (NTSC land) is that you'll never see a
Progressive source (ie, PPPPPPPPPPPPPPPPPPPPPPPPP) every frame, on your TV
set from your Cable/Satellite or Antenna sources. And, not any Telecine or
other weardness w/ II's in them. I mean all Progressive frames.
.
In the 4 years I've ben working w/ Video, I've never seen this in all my
sources, which were Cable; Satellite; and now back to Antenna.
.
The only time when I do see full Progressive source, (after I capture it)
are short commercials. I think one of the Gellette commercials has a
Progressive-Only commercial.

-vhelp 3034