Quantcast KDVD Resolution for Divx? - digitalFAQ.com Forums [Archives]
  #1  
06-22-2003, 05:47 PM
beany101uk beany101uk is offline
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Most of my sources are Divx movies. As most of these have non-standard resolutions that work out about the 352x480/576, I was wondering if it is worth it encoding these using KDVD at the 720x480/576 template or if this would just be a waste of time and I should use the Half-DVD templates.

Oh, also I would be very grateful if anyone could tell me the best filters to use for my Divx sources using the KDVD template.

Thanks in advance.
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  #2  
06-22-2003, 06:19 PM
kwag kwag is offline
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Hi beany,

Use KDVD Half D-1. There's no sense in upscaling, as you'll loose quality

-kwag
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  #3  
06-22-2003, 06:54 PM
beany101uk beany101uk is offline
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Brilliant, thanks Kwag.
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  #4  
06-22-2003, 10:30 PM
Jon Read Jon Read is offline
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Seriously ? Bummer. I have been using DIVX files with the full KDVD templates assuming these were naturally better quality. Does tha mean I have beeen wasting disc space and even making the quality worse ?
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06-22-2003, 11:22 PM
urban tec urban tec is offline
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Quote:
Originally Posted by Jon Read
Seriously ? Bummer. I have been using DIVX files with the full KDVD templates assuming these were naturally better quality. Does tha mean I have beeen wasting disc space and even making the quality worse ?
I have been doing the same Jon and on my tv I dont see any loss but I dont have a HDTV (I'm so jealous Kwag ).

If I were trying to fit 6 hrs or more on a dvd then I suppose I would choose 1/2 D1 as well.
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06-23-2003, 01:37 AM
kwag kwag is offline
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The thing is you're blowing up a picture, just like if you take a JPG and zoom in twice the resolution. There's a quality loss right there

-kwag
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  #7  
06-23-2003, 03:15 AM
urban tec urban tec is offline
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Quote:
Originally Posted by kwag
The thing is you're blowing up a picture, just like if you take a JPG and zoom in twice the resolution. There's a quality loss right there

-kwag
You are right Kwag but isnt that the same as what your dvd does when it reads a 1/2 D1 resolution doesnt it strech it to fit the screen?

This is my understanding of how it works or am I mistaken.
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  #8  
07-09-2003, 06:32 AM
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Quote:
Originally Posted by urban tec
Quote:
Originally Posted by kwag
The thing is you're blowing up a picture, just like if you take a JPG and zoom in twice the resolution. There's a quality loss right there

-kwag
You are right Kwag but isnt that the same as what your dvd does when it reads a 1/2 D1 resolution doesnt it strech it to fit the screen?

This is my understanding of how it works or am I mistaken.
May be everybody is right here, and may be there is more magic than technics in this business, I don´t know, but I allways do 720x576 and my family swear than there is a better quality than in the proper Divx and me too, but I will not repeat this facing "technicians".

Nomada
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  #9  
08-01-2003, 03:44 PM
reman reman is offline
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I have been taking all sorts of resolutions and converting to 720x480 with latest TMPGENC Plus. WOW! I use the KDVD template but change the FPS to 29 and min max to 500 - 5000 at 66 to 80%. The quality is great! I can usually get 2 movies (DivX) on 1 DVD-R.

Several 352x272 (who knows why someone encoded that size) files worked great! The quality of these is not as good as a 640x480 for example BUT it is better then the VCD versions.

My guess is that the high bitrate and CQ allow TMPGEnc to work its magic. I have not tried the KDVD at 23fps...waiting until I get a DVD-RW disk.

Food for thought.
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  #10  
08-01-2003, 04:12 PM
vmesquita vmesquita is offline
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My personal experience have shown that downscaling only horizontally DivX files tend to create (or increase) annoying mosquito noise, using TmpgEnc or CCE. I have some 2hours DivX movies in 1CD in 576xxxx that when resized to 352x480 with little sharpening looks about the same on TV-Out. But when I encode, it seems that "invisble" mosquito noise that was already there becomes very visible. I am still struggling with this. But 640xxxx DivX in 2CDs should be done at 720x480. Definatelly you won't get any resoultion (and even you'll loose some because resizing is not lossless, any resizing blurs the picture a bit), but you will loose *a lot* more downscaling to 352x480 besides the mosquito problems. Just remember to use bicubic. You can also try the non-standard resolution of 528x480, but I prefer to stick in the standards.

@reman
Are you downloading 29.97 fps DivX? Are they movies? If they are, probably the guy who did them forgot to IVTC... You can gain a lot of free compression by doing this. I generally put 6 hours of movies in one DVD, and sometimes one of them even have AC3 5.1 audio (of course, not always this is possible, some bitrate consuming movies won't allow this)

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  #11  
08-01-2003, 06:11 PM
reman reman is offline
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They are 23, 24, 25 29, 352x240, 352x288, 640x480 etc etc...

It amazes me how many types there are. I like 29fps and use mpeg1 layer II for audio at 192bit. If the movie is worth it I will use AC3.

Oh well! I really do it for the fun of seeing if I can get the encoding right.
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  #12  
08-01-2003, 06:29 PM
vmesquita vmesquita is offline
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But if you are just increasing the framerate to 29.97, audio must be getting out of synch, right? Let´s see: 25 are PAL Rips, 23 and 24 are NTSC Rips with BAD synching method (which BTW consists of change the frame rate to get the audio synched). 29.97 is the NTSC standard, any movie with framerate around 29 should be something with a bad deinterlacing tecnique (or none) corrected using the BAD synching method.
Why only use AC3 if the movie is worth? I think AC3 audio is better than MP2, but I really never compared them, would be good to see if MP2 beats AC3. What do you think?

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  #13  
08-04-2003, 01:41 PM
reman reman is offline
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Have not had any sync problems yet. Maybe that is due to the program using ssrc and toolame for the conversion to mpeg1 layer II at 192 (I have used 128-384). It saves out a temp WAV file then converts. As TMPGEnc encodes blocks of video it "grabs" the audio for that block of time??? Kinda, muxes them?

AC3 is the MOST compatible for use in DVD's and supports more channels. However, I do not hear any difference. If I needed space I would go with mpeg and AC3 for Dolby 5.1 uses.
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