Quantcast Shrinking Two KVCDs to one with DVD Shrink? - digitalFAQ.com Forums [Archives]
  #1  
08-21-2003, 07:07 AM
Avalon Avalon is offline
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So I've as always a crasy idea!

I'm starting today shrinking an encoded KVCD 50% so I can put it with another one on one CD.

I'll write a guide if it works and I can still see something
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  #2  
08-22-2003, 03:36 AM
incredible incredible is offline
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I already did it .... long time ago, started with standard SVCDs.
This idea was already treated in forum.doom9.de

@ All

Quality was worse as if you directly encode your stream with a CQ which fits to the final size you want, no matter if the stream is encoded using standard SVCD template, KVCD or other.

My experience with dvd shrink is, that its a "defcon5" tool, just to decrease the filesize about 5%.
If you treat it with values over 5-10% you will receive a bigger amount of bad Quality as if you directly encode using the CQ "right" way.

Here a quote from "duartix" @ doom9.org which explains the "basics" of such transcoders as DVDShrink or DVD2One:

Quote:
all trancoders are leaving MV (motion vector) data untouched. All the magic is done by working in the remaining coefficient data (DCT).

I can tell you how DVDShrink 2.3 is working:
It takes the compression ratio you define (ex: 70%) and then when it picks a frame it reduces the DCT data until the entire frame comes down to 70% of it's original size.
If there is a lot of DCT data in the frame, perhaps it will reduce the DCT something like 35% (there isn't just DCT data in the frame, so it must reduce more than 30%).
If there is a lot of MV data in the frame, it may have to reduce the DCT something like 80% to achieve the same final frame compression.
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  #3  
08-22-2003, 04:43 AM
new_bee new_bee is offline
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DVDShrink 3 has variable compression, though. I transcoded THE FELLOWSHIP with Nero Recode, IC7, Shrink 2 and Shrink 3 and Shrink 3 was WAY better than v2 (using deep analysis). Of course Nero Recode was best, but Shrink has improved. It can compete with IC7. It's different though because it tends to produce macroblocks, whilst IC7 produces mosquito noise.

I find transcoded movies VERY watchable up to 30-40% compression. Did Matrix 1 and I can't see the difference to the source.
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  #4  
08-22-2003, 04:55 AM
incredible incredible is offline
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Well lets see, and lets push the limits of our compressions

One day we will carry our Movies on a USB Memory Stick, .... it only will take time to find a way to do it!
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  #5  
08-22-2003, 11:26 AM
kwag kwag is offline
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Quote:
Originally Posted by incredible
One day we will carry our Movies on a USB Memory Stick, .... it only will take time to find a way to do it!
We can do that (almost!) right now, with a Pocket PC. I did "The Matrix" on 128MB, and it fitted in a Pocket PC, encoded at the resolution for that machine's screen. It looked pretty damn good for a 2+ hour movie

-kwag
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  #6  
08-22-2003, 12:03 PM
Icarus3000 Icarus3000 is offline
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Kwag:

Do you have a TMPGenc template for converting to PocketPC resolutions?

Thanks,
Icarus
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  #7  
08-22-2003, 12:44 PM
kwag kwag is offline
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Quote:
Originally Posted by Icarus3000
Kwag:

Do you have a TMPGenc template for converting to PocketPC resolutions?

Thanks,
Icarus
The old PocketPC templates were thrown away, because you can get better results with the ULBR.
Just set the resolution on the ULBR to the resolution on the Pocket PC. My encode was 320x176 for a wide screen movie.
Also, you should encode the audio at 64Kbps with HeadAC3he, and use "Joint Stereo".
Change the MIN bitrate to 0, and set the MAX to 256Kbps.
You're all set:
Here's a sample, done with one of the old template, way before KVCD's "Notch" matrix. So you can now expect better quality than this
http://www.kvcd.net/matrix-ppc.m1v.mpg
PLEASE, view it on WMP at it's default resolution. Don't try to zoom, because it will look crappy. It looks really fine at it's encoded resolution of 320x176, and that's the way it will look on a Pocket PC

-kwag
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  #8  
08-22-2003, 05:24 PM
Avalon Avalon is offline
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recode should be best? So I'll try it...

Edit: I looked at Recode of Nero. For the first view it looks like DVDShrink, but with priority options???
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  #9  
08-25-2003, 10:46 PM
Icarus3000 Icarus3000 is offline
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Kwag:

I don't actually own a pocket PC, but am looking for a template for sending home videos of my kids to the grandparents via e-mail. To date I have been converting via windows media, by I would like to try a low res KVCD conversion to compare quality.

Thanks,
Icarus
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  #10  
08-25-2003, 10:52 PM
kwag kwag is offline
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Hey Icarus3000,

I'm pretty sure you'll like the quality better than the WM counterpart

-kwag
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