Quantcast KDVD: Saving the Step of Resizing? - digitalFAQ.com Forums [Archives]
  #1  
09-29-2003, 04:34 PM
Jellygoose Jellygoose is offline
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Hi everybody...

This might be a stupid question, if it is, I apologize...
If I wanted to create a MPEG File with 720x576 resolution, out of a PAL DVD backup, couldn't I just leave out the complete step of resizing, since my source and my target resolution are identical

Wouldn't that save me a lot of encoding time? If I set MovieStacker to give me the data for resizing from DVD to DVD it gives me this:

Code:
BicubicResize(720, 432, 1/3, 1/3, 0, 0, 720, 576)
AddBorders(0, 72, 0, 72)
what If I just dropped these two lines completely, and received my Overscan with the Letterbox filter?
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  #2  
09-29-2003, 08:18 PM
vhelp vhelp is offline
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hay Jelly.. pal,

IMO, (and you are on the right track) better quality can be obtained if you
allow TMPG to do the resizing (if necessary for resizing) and just use the
CROP feature in TMPG instead.. as long as you follow the AR rules and
use the following appropriately:

Video Tab
* size
* aspect ratio

Advanced Tab
* source aspect ratio:
* video arrange method:
* [x] Clip frame (per above two)

.
.
then, my 2nd IMO's...
* dont crop!!
* Just use Clip Frame to clean up any left over mess (Lt/Rt/Top/Bot)
* ie, if move is 720x576, keep at this size (video tab) and use Clip Frame
...and select [x], [x] for left/right/top/bottom clean up adjustments

Ok, 3rd IMO's... tip...
* if you are planning on resizing (for reasons) ie, VCD or CVD
...projects, please leave the DVD original size as is, ie, 720x576 and
DON'T
...resize in your script or vdub. Let TMPG resize down to lower resolution
...via the Video tab's Size[xxx] x [xxx] feature.
...yes, speed will decease, but if "quality" is your main objective, then the
...above will be in your best interest

I have ben messing around w/ this area for quite a while now. I too, use to
do it vdub or AVS script way, but now I prefer to leave the resing to TMPG,
(if I need resizing done at all)
Get the AR down first. ie, if you are planning on the future, and expect to
get an widescreen, then definately leave the resolution alone, else at bare
min. lower your res no lower than 704x480/576 and remember to properly
AR your source (hint, those black bars)

Hope I didn't bust too many screws
-vhelp
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  #3  
09-29-2003, 11:20 PM
kwag kwag is offline
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Quote:
Originally Posted by vhelp
hay Jelly.. pal,

IMO, (and you are on the right track) better quality can be obtained if you
allow TMPG to do the resizing
What
TMPEG doesn't even come close to a "precise" resize, as provided by AviSynth resizers.
TMPEG resizing will always show some "jagged" edges, as opposed to a correct resize, by Lanczos, Bicubic, etc.
Even Vdub's resizing is better than TMPEG, but still doesn't match the current AviSynth resizers.

-kwag
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  #4  
09-30-2003, 07:44 AM
Jellygoose Jellygoose is offline
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Thanks VHelp, thanks kwag!

Well vhelp, you hinted at it in the end, and I apologize for not knowing THAT much about the whole topic, and for not understanding everything you said...
Ok, I usually do all my resizing with AviSynth of course. But my question is, why would I actually want ANY resizing (either by Avisynth or by TMPGEnc) to be done, if my source and target resolution would be identical? Why is this option present in MovieStacker/FitCD ?
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09-30-2003, 07:53 AM
kwag kwag is offline
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Quote:
Originally Posted by Jellygoose
But my question is, why would I actually want ANY resizing (either by Avisynth or by TMPGEnc) to be done, if my source and target resolution would be identical?
Hi jellygoose,

If you want to encode with original aspect (Anamorphic), then you don't need any resizing at all. Output = Input.
However, if you want to make your picture 16:9 from an anamorphic source, and use blocks TV overscan (to save bitrate and obtain higher quality), then you must resize.

-kwag
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09-30-2003, 08:03 AM
Jellygoose Jellygoose is offline
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Sorry again, for my poor knowledge in this particular case, but...

If my source is a 16:9 DVD @ 720x576 resolution, and my target is meant to be an XVCD (I call it XVCD because of the non-standard resolution) (which of course needs to be 4:3) also @ 720x576 resolution, and I would not want any Overscan by resizing but only by overlapping (Letterbox Filter) would it work without any resizing lines, if I'd just feed TMPGENc with the AVS script with no resizing parameters?

Sorry to be a
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  #7  
09-30-2003, 08:04 AM
jorel jorel is offline
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maybe a stup answer:
load only the source and the filters....like:
(using the MA as sample)

Mpeg2Source("Your_D2V_Source_Here")
#
undot()
Limiter()
asharp(1, 4)
#GripCrop(Your_GripCrop_Parameters_Here)
#GripSize(resizer="BicubicResize")
STMedianFilter(8, 32, 0, 0 )
MergeChroma(blur(MaxTreshold))
MergeLuma(blur(0.1))
...

is this Jell?
cool or lame?
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09-30-2003, 08:31 AM
Boulder Boulder is offline
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Quote:
Originally Posted by Jellygoose
Sorry again, for my poor knowledge in this particular case, but...

If my source is a 16:9 DVD @ 720x576 resolution, and my target is meant to be an XVCD (I call it XVCD because of the non-standard resolution) (which of course needs to be 4:3) also @ 720x576 resolution, and I would not want any Overscan by resizing but only by overlapping (Letterbox Filter) would it work without any resizing lines, if I'd just feed TMPGENc with the AVS script with no resizing parameters?

Sorry to be a
If you author the movie as a DVD, you can skip the resizing.

Keep the resolution at 720x576 and encode as 720x576. Just select the 16:9 as the destination and source aspect ratio. When you author the clip, remember to set the aspect ratio as 16:9 unless the program you use does that automatically.
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09-30-2003, 11:27 AM
Jellygoose Jellygoose is offline
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Thanks for all your input !!

@ Boulder: Well I actually wanted to make an XSVCD with 720x576 MPEG-2 for a friend of mine, which is the only SVCD resolution that player would read! Weird I know! Anyway, that would screw up the AR without resizing right? because the DVD is 16:9 and SVCDs and VCDs have to be 4:3 right?
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09-30-2003, 12:02 PM
kwag kwag is offline
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Hi jellygoose,

The output on TMPEG is just a "flag"
So encode without resizing, and set your output to 4:3.
Your encode will have the same aspect as your source.
If you get an incorrect aspect, the it means the equipment you are playing it on doesn't like the resolution encoded as 4:3 anamorphic (as XVCD), and you'll have to encode 720x576 with anamorphic destination OFF, and also encoded as 4:3. Then it should play correctly.

-kwag
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  #11  
10-01-2003, 09:14 AM
Jellygoose Jellygoose is offline
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Thanks kwag! I got it right now!
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