Interlacing qustion?

[shochan]

I read on the wintv pvr forum sme where that you do not have to deinterlace if you plan on playing it back on a NTSC TV. And the reason why it looks interlaced on the computer is because your monitor is progressive. the question is....

Has anyone ever heard this before? Im going to try it out in a few hours when i get off of work.

I'll check back before then to see if anyone replies.

[kinneera]

Yeah, this is kind of common knowledge for those of us who live in the NTSC part of the world. There have been tons of posts about this... keep in mind that MPEG1 doesn't support interlacing though.

[vhelp]

shochan,

All I know is this. . . when I capture (x480) to AVI from any source, be it
TV, VHS, DVD, etc., IT's INTERLACED!!


Sample Clips . . .revised web site

[homerpez]

This was so confusing to me for the longest while, but I've finally made it to the point where I THINK I can add some to your clarification. As in, what to do.

Personally, here's what I do.

IF YOU MAKE A VCD (MPEG-1), only capture at 352x240, or *x240 (so long as it's 240 vertical). This will make your video capture not have any interlace lines at all. If you have a lossless codec (Huffy), use 352x240 and just encode directly to VCD format. Easy.

IF YOU MAKE AN SVCD (MPEG-2), capture with at least 480 vertical (352x480, 480x480, or 640x480), again with a "lossless" codec is best (HUFFY). Since Interlacing is supported on MPEG-2, and assuming you encode with TMPGEnc, simply select both "Input" and "Output" encode formats to "Interlaced". That's it. That's all.

Interlaced does look fine on a regular TV, but only in a supported format. If you allow interlaced video to get encoded to MPEG-1, it will try to encode those lines too. Bad news.

Hope that clears something up for you. (I wasn't sure about that until a few weeks ago, and I've made 50+ VCD's and SVCD's).

[CocoPops]

Just a side note...

If you have a ATI Radeon it will show interlaced mpeg2 files just fine on your monitor (it's does some sort of smart de-interlacing).

Don't know of any other hardware / software that does that.

[mikk]

resizing is a quick and dirty way of removing interlacing. but it definitely isn't the best (it makes the picture have ghosting). tmpgenc has a deinterlacing filter. double is the best mode to use. halve the framerate too because it doubles it (to 50 or 60). the even or odd modes look sharper, but they make sharp edges a bit jagged and stepped, so i never use them.

just remember that it's impossible to deinterlace 'perfectly' because the odd and even fields of an interlaced picture are taken at different times. that's why displaying them progressively gives the picture a 'combing' effect. resizing the image just blurs the combing into a ghosting effect.

the deinterlacing in powerdvd seems to be a bit dumb because it just vertically filters the image, blurring it.

PAL and NTSC are both interlaced.

[Jestorius]

Pal - vcd from DV.
In Tmpgenc - deinterlace the Blend 2x fps adaptiv is the working setting. It makes a film blur effect.

[homerpez]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR size=1 color=black></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2001-12-02 05:41:35, CocoPops wrote:
Just a side note...

If you have a ATI Radeon it will show interlaced mpeg2 files just fine on your monitor (it's does some sort of smart de-interlacing).

Don't know of any other hardware / software that does that.</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

This is SO true.

It really makes me long for ATI MMC to be improved (speed, and frame drop problems). I've said time and again, the only thing this software does right it the de-interlace. The result is as close to progressive as I've ever seen, short of a DVD.