Choosing size when converting to DVD!

[correioelet2002]

Hi, my question here is: I got a 512x384 DivX I want to convert to DVD. How do I actually achieve the best results?

It crossed my mind that if I convert it to standard DVD size on TMPGEnc, which is 720x480 for NTSC, the video will actually get worse that it originally is, right? In this case I will be creating more pixels than the original video contains. Shouldn't I just convert to DVD but KEEP the original 512x384 size for absolutely NO LOSS?

[yoda313]

Hello,

convert to DVD but KEEP the original 512x384 size for absolutely NO LOSS?

NO! That can't be done. The only acceptable dvd resolutions are:

720*480 full d1
352*480 half d1
320*240 (VCD but upcode audio to 48khz)

Those are it for it to work on a standalone dvd player in dvd format.

The only other option is to leave it in divx and buy a divx compatible dvd player. OR convert to half d1.

Kevin

[correioelet2002]

Ok, but in my case, should I convert it to 352*480 half d1 to keep it as closer as the original video or converting it to 720x480 is ok?

Is that theory about the image getting worse when making the size bigger than the original DivX?

[yoda313]

Ok, but in my case, should I convert it to 352*480 half d1 to keep it as closer as the original video or converting it to 720x480 is ok?

Is that theory about the image getting worse when making the size bigger than the original DivX?

Hello,

You'd probably be better with the 352.480 half d1 resolution. It's a little closer than full d1.

Kevin

[correioelet2002]

thanks a lot !

[jimmalenko]

Ok, but in my case, should I convert it to 352*480 half d1 to keep it as closer as the original video or converting it to 720x480 is ok?

Is that theory about the image getting worse when making the size bigger than the original DivX?

You'd probably be better with the 352.480 half d1 resolution. It's a little closer than full d1.

There are a couple of differing points of view on this matter - there was a thread the other day that had a very similar question to this that talked about how upsizing is bad, but also how downsizing was throwing away information. If you're so concerned about quality, why don't you do a 30 second or 1 minute test encode on both settings and make up your own mind ?

[MrMoody]

Mine is, upsizing is bad but downsizing is worse, so always upsize if those are your only choices. Use a nice sharpening resize like Lanczos or Bicubic.

[monzie]

This topic again eh?

Upsizing is the way to go. As I mentioned before I find the BEST resolution for a 512 X 384 avi is to encode at full spec with a video size of 656 X 448 (borders of 32,16,32,16).

Overscan on your TV will make the borders shrink to a negligable (spelling?) size.

Using half D1 is an UPSIZE in the vertical of 25% (compared to my stretch of only 16.5%) and yet a MASSIVE loss when going down of 37% when taking square avi pixels v NTSC pixels into account (and a GIGANTIC drop of 50% after the UPSIZE to 480 in the vertical) compared to my stretch of only 16.5%.

You dont even have to bother doing testing as I'm giving you the answer.

As said above use either BICUBIC or LANCZOS as your resizing filters.

If the half D1 advocates would like to explain their reasoning and which 'incredible' resize filter they use (which stretches and shrinks both at the same time yet gives A1 results), then be my guest.

Oh, and one final point, the last time this topic was posted some bright spark showed a VDub clip resized to 352 X 480 but (doh!) showed an AVI preview and not a mpeg2/DVD resized (704 X 480 4:3) preview......hmmm

[lordsmurf]

Didn't you post this like 1-2 times already.
My vote: 352x480

If I remember, it came from tv and was compressed to hell with DIVX. No reason to use anything higher than 352x480.

[correioelet2002]

Thanks everybody and no, it wasn't me who posted this before.

[jimmalenko]

I prefer to throw away information rather than let software create it for me. For this reason, I go to VCD (352 * 288) when confronted with this frame size.

*My* personal preference and I've always been happy with the results of doing this, after all, it's a (most likely downloaded) DivX, which is probably questionable in the quality stakes anyway. I've been very disappointed with quality when upsizing using any method, but maybe I need to RTFM