Question about deinterlacing a DVD

[DarkFear_DK]

Hello Peeps,

I just have a fairly simple question, for which I do not and has not been unable to find any answers to. So I hope you guys can help me. Please bear with me, as I'm still new to this whole concept.

The question is:

Why should I deinterlace the video on an original DVD when I'm backing it up to a DVD-R?

From what I've been able to gather, then deinterlacing is primarely for people who watch their movies on their PC.

I mean... There must be a reason why the original DVD is interlaced, then why should I deinterlace it? The original DVD shows no sign of interlaced material when watching it on my TV.
I know that video-cameras just work this way (records interlaced material).

So why should I change it, when the movie studio has had every chance to do it themselves? :confused:

I hope you guys can make my mind slow down :)

Thx in advance!

-- DarkFear_DK

P.S. I've read http://www.100fps.com/, which explains what it is, but I'm still confused as to why I should deinterlace when it's not seeable to my own eyes?

[scharfis_brain]

Never deinterlace your videos, if you want to go for DVD and TV.
Not everything described on 100fps.com is correct.

[RB]

I couldn't agree more. I have never ever deinterlaced any of my 100+ DVD backups. Note that 100fps.com specifically talks about DivX/XviD backups. These video codecs simply have no interlaced coding mode, that's why you have to deinterlace. MPEG2 however supports interlaced coding. And it's not even a matter of viewing your backups on a TV vs. PC. Every current software DVD player I know provides very decent on-the-fly deinterlacing (often supported even in hardware by modern nVidia/ATI chips).

Yes, interlaced video naturally requires more bitrate to look good, but deinterlacing it prior to encoding introduces just different artifacts. I personally don't mind spending more-than-usual bitrate to interlaced DVD extras as the main movie is progressive 99% of the time and will look great at even a little lower bitrate. Something else I do from time to time is resizing interlaced 4:3 extras to half D1 resolution (352x576/480) to have them look better at lower bitrates.

My personal recommendation for DVD to DVD-R backups simply is to not deinterlace :)

[DarkFear_DK]

Wuhu :D

Thanks for the quick and decisive answer :D

My mind may now rest easy once again... hoho..

[DarkFear_DK]

Then I just have one last question.

In my .avs scripts theres a line called

ConvertToYUY2(interlaced=true)

That line should not be change to false, right?

It does not have anything to do with deinterlacing, or am I missing something here?

[TheSeeker]

You can safely set that to FALSE. Like everyone said any decent software dvd player does de interlacing. but to RB divx xvid encoders absolutely do do progressive encodes. you dont HAVE to de interlace if you are encoding to divx at all.

[RB]

You can't just set it to false. Please read the CCE FAQ, Q14.4 (see my sig).

[hendrix]

Originally posted by DarkFear_DK
In my .avs scripts theres a line called

ConvertToYUY2(interlaced=true)

That line should not be change to false, right?

It does not have anything to do with deinterlacing, or am I missing something here?

just leave it as is...i always do and it turns out fine