Interlace Problem + Resolution Question

[dfourthhorseman]

I recently tried to back up my anime series Vandread to divx 5.0 standard. I first used smartripper to rip it and then encoded it set at 300 kbps at 720x480 with full zoom. However, when i played em back i can see interlaces during fast movements at times. I used virtual dub to use its filter to get rid of em but is there a way to get rid of em during encoding? I heard resetting the resolution lower can do it. I heard the deinterlace feature will only make it worse, is that true?

Oh and also, not really that important but maybe related the first problem, what is the whole resolution thing anyway? I've seen it set at desktop resolution (640x480), n then half of dat (32x240), n also other mixtures. Shouldn't you just set em at the original resolution of the dvd, like i did with the 720x480? Why do people cut it by half? What does that do?

Thanks in advance, any help is welcomed
Ruibing

[UncasMS]

vd internal de-interlacing filter are NOT the best you could get!

i'd suggest you try either TELECIDE from donal graft or AREA BASED from gunnar thalin

both are vd filters and can thus be used in any vd/nandub version
a simple search


link to donald graft

link to gunnar thalin

thalins filter is for pal though - no idea how good it is for your animes.

i wouldnt say, a decent de-interlacer makes matters worse!
but you might have to do a little test run to see which one works better.

as for resolution: an avi of 720 x480 might look worse than 576x 384 because the bitrate stays the same for both versions but has to 'cover a bigger area' when applied to 720x480

thus a smaller resolution ( i go for 640 x XXX most of the time as a good compromise) might be a better choice!

[dfourthhorseman]

So...

Most of my dvds are at 720x480 resolution in NTSC form with 4:3 ratio. What should my resolution and zoom be? Is 360x240 good, or 320x240?

Thnx
Ruibing

[UncasMS]

reducing your size THAT much will result in less sharpness and loss of details!

i consider 640 x XXX (xxx depends on more than 480 as original resolution! anamorph e.g. makes a difference) the best compromise for a 2 cd rip.

for proper resizing, you will have to make yourself familiar with some more basics, don NOT use a fixed size anyone might tell you!

the resizing function in gordion knot is very precise and might help you alot.

[Enchanter]

Vandread episodes have an aspect ratio of 16:9, so you can use a resolution of 640x368 or 512x288 or so.

[dfourthhorseman]

But isn't it like if you make the resolution 384x288 or below there will be no interlace?
I tried gordian knot, it recommends 640x464, dat sounds bout right neh?

Thnx for all your help
Ruibing

[Enchanter]

It's kind of difficult to explain the whole thing about how resolution, bitrate and CPU power required for playback relate to each others, especially when it is all available in the guides around (the good, established ones, like Doom9's and Nicky's).

Basically, you assign a certain amount of bitrate to your movie and it dictates how large your video will be. Generally, the higher the bitrate, the better the quality is, but the larger the video will be. As for the resolution, a higher video (NOT desktop) resolution will require more bitrate, though you can still make do with the same amount of bitrate for lower resolutions (at the expense of macroblock possibilities and somehow less sharp picture). Lastly, too large a resolution (and sometimes too high a bitrate) will choke sub-GHz systems, because these videos are just too demanding on the systems. A lower resolution at (640 x X) or (512x X) are the generally accepted resolution for high-quality videos. If you're thinking of fitting about 13 episodes into 1 CD, you can use a much lower resolution of (320 x X) (And hence be able to use a much lower bitrate and hence smaller video file size).

p.s. Resolution has nothing to do with removal of interlacing artifacts. You need to do a deinterlace process or some other methods.

You get the idea there.

[dfourthhorseman]

icic. I think I get it now. But I have new question. I tried doing it again, with DVDx 1.8a, with divx 5.0.1, resolution 720x480 (changed), quality to slowest, and set source interlace to all source are interlaced, n everything else at default. IT was done in 1-pass mode. It was a test run and i found that the interlace was almost unnoticeable, but I discovered a problem, more like a question. It was suppose to encode at 600kbps but instead it did it at 122kbps, why?

I know its probably a newbies question, but plz help. Is it the quantizer setting? RC setting?

Thanks everyone
Ruibing

[dfourthhorseman]

LOL I found out the answer for myself right after the last post. I got another questio though, does anyone know the link to a good divx 5 bitrate calculator?

Thnx
Ruibing

[UncasMS]

resolution actually DOES make a difference in terms of interlacing!!

Movies that are 384x288 and below cannot be interlaced. So 384x288 is the biggest size where you can be sure, that you have a progressive-frames-only video.