tmpgenc mpeg settings interlaced vs non interlaced ?

[steve_r]

I was wondering what interlaced video source type and non interlaced meant?

I encoded some movies with tmpgenc from dvd that seemed to say interlaced when I opened them with dvd2avi
but I encoded them as non interlaced...I am wondering if this a major mistake or what exactly I will loose from not choosing the interlaced option like the source.

and if I should keep interlaced selected in the future.

[theDruid]

Steve - good question!

I hope someone will enlighten us soon.

mcdruid.

[SingSing]

DVD rip should be non-interlace, since nearly all DVD can be play
in a progressive player.

mini-DV is interlace, at least that's what my DigitalCam software say so.

Video capture is depends on your capture setting.

[steve_r]

So by choosing non interlaced I didn't mess up quality or anything I would gain by keeping it interlaced?

It is actually better to choose non interlaced?

I saw the dvdrip faq where he rips for his ipaq pocket pc and he chooses the interlaced option like the source.

[EricB]

You might want to do a search on interlacing on this site, there is a lot of info!

In general, you want to avoid deinterlacing if possible. The algorithms all involve compromising information from the source by either averaging two fields, or eliminating one or the other. If your destination is SVCD or DVD, usually you will be showing these on an interlaced TV. VCDs are automatically deinterlaced during encoding due to the frame size.

If you intend to show your SVCD or DVD on a computer you can handle the interlaced information by using a software DVD player like Power DVD. These handle the interlaced format automatically.

So bottom line, if your source file is interlaced, then try to keep your destination interlaced.

[snowmoon]

Ok, interlacing is the effect cause when two fields ( odd /even lines ) of a frame are from diffrent moments in time. Since your TV is an interlaced device you will not see the same effect there. Each field is 240 scanlines ( ntsc ) so VCD is only one field of video and therefore is always progressive.

For those video's greater than 240 scanlines ( NTSC ) there are three major types.

1) True interlacing: Every distinct field is from a diffrent moment in time, so in fact you are seeing 60 fields per second of video. Generally this is most commonly used in video production ( camcorders, sports, ... ).

2) True progressive: Evert frame ( 480 scanlines ) is from a unique moment in time. You should never see interlaced "artifacts if this is the case.

3) Telecine aka 3:2 pulldown: This is a process by which 24 (23.976) fps materal is altered for display on NTSC video systems. This can be seen as 2 interlaced, 3 progressive, 2 interlaced, 3 progressive. ALMOST EVERY MOVIE OUT THERE IS DONE WITH TELECINE WHEN PUT TO VIDEO.

I'm going to talk a little more about telecine since movies are what most people are interested in. I will talk about three types of telecine.

Hard: Analog captures are always hard and some DVD's are hard ( the chepo's that were transfered from LD often suffer from this ). The 3:2 pulldown patten has permenetly altered the video stream. To remove this kind of telecine you must use a good Inverse Telecine aka IVTC, 3:2 pulldows removal filter to restore the original 24 (23.976) progressive source.

Soft: Most Mpeg-2 telecine is done this way. The video is actually stored as 23.976fps with a few flags thrown in for repeat top or repeat bottom field. When played back through your STB DVD your player faithfully restored the telecine to that materal as it plays.

Hybrid: A mix of the former. Generally it must be treated like a hard telecine unless the ammount is tiny and would not really affect viewing quality.

As alwyas much information can be found by searching on any of these terms.

[steve_r]

From my experience when I open the d2v file i got from dvd2avi which came from dvdripper in tmpgenc it shows it as a non interlaced file.

But the vts files that came from dvdripper in dvd2avi are interlaced when I preview them.

So should I leave them non interlaced as tmpgenc chooses or should i select them to be interlaced for my final mpg.

[snowmoon]

DVD2avi should have an option force film, use it and you should get a 23.976 progressive .avi as a result. Use progressive, 23.976fps, and 3:2 pulldown on playback in TMPGenc ( already set for SVCD Film templates ).

[Diciple]

Snowmoon,

So are you saying I should be looking for Telecine encoded movies when I download? Is that the best to look for or what?

[eKa]

Just a late comment : I have had conversions where the picture breaks up into lines, especially during fast action sequences, by changing the interlace selection and redoing the entire process the problem is resolved!

So I now check the output prior to burning to ensure there is no picture breakup..

MAD MAX is an example this.


Eka