HVS matrices for mpeg2 encoding

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HVS matrices for mpeg2 encoding

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shiroh

Account closed as per user's own request

4. May 2004 @ 09:04

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have any of you tried encoding vcd/svcd/dvd using the Didees's HVS matices or any custom made matrices out there ?

just asking.

cheers

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Minion

AfterDawn Addict

4. May 2004 @ 15:49

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I personally use a Matrix of my own for most of my Low bitrate encodeing...My Matrix allows be to get about 200 Minutes of Full D1 resolution Video on a DVD-R useing an average bitrate of about 2700kbs and the Quality is very good considering the bitrate used...I also usually use CCE SP 2.67 for most of my encodeing useing this matrix....Cheers

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shiroh

Account closed as per user's own request

5. May 2004 @ 00:53

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and you want to share these matrix of yours ? :P

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Minion

AfterDawn Addict

5. May 2004 @ 12:05

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Sure I got no problem shareing it:

Intra:
10 16 19 22 24 26 27 28
14 16 20 22 26 28 28 30
18 22 24 26 28 30 32 35
20 22 26 28 29 32 34 38
22 26 27 29 32 35 38 46
24 27 29 32 35 38 46 56
26 27 29 34 38 46 99 99
28 29 34 38 46 56 99 99

Non-Intra
16 17 18 19 20 22 23 24
17 18 19 20 22 23 24 25
18 19 20 21 22 24 25 26
19 20 21 22 24 25 26 27
20 21 22 24 25 26 27 29
21 22 24 25 26 27 29 30
22 24 25 26 27 28 99 99
23 25 26 27 28 30 99 99

This matrix works best with Progressive sources files...Cheers

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vurbal

Staff Member

2 product reviews

6. May 2004 @ 05:45

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Thanks for sharing those Minion. I'll have to try them out. You don't happen to know of any good web sites (or books) for understanding quantization matrices do you? I've gotten to the point where I understand a lot about MPEG encoding, but I feel like I'm missing the big picture not understanding them.

I've looked at the matrices used by a lot of different DVDs, as well as various others for low bitrate encoding. It would be nice to actually understand the numbers. For example, your Intra matrix starts with 10 while I think every matrix I've looked at starts with 8. I find that interesting, but I'm not positive what the significance is.

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Rich Fiscus
@Vurbal on Twitter
AfterDawn Staff Writer

Minion

AfterDawn Addict

6. May 2004 @ 12:44

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Well Understanding Quantize Matrix is a Very difficult thing I don"t think I fully understand it either and what I do understand I find very hard to explain...The numbers represent the way that the bitrate is distributed through the frame the way I got my Matrix wat takeing the Mpeg standard Matrix and changeing it slightly and then do encodeing experiments to see the results of the Changed Matrix and sometimes the Change was bad and sometimes the Change helped and I studied other Matrixes to see how they were set up and experiment with those and then try to transpose aspects of those matrixes into my own, If you have ever used CCE SP you might have noticed that it comes with a Wide variety of Different Matrixes and some of them are really quite good...The matrix is an Important Part of mpeg encodeing but not as Important as it might seem, as long as the encoder has a Standard Matrix available the Quality shouldn"t suffer and not all matrixes work well with all file types, The matrix that I posted only works really well on Progressive material that is being encoded useing a ZigZag scanning Pattern..(you should allways encode interlaced material useing a Alternate Scanning pattern and a Zigzag pattern with Progressive material)... Well Good Luck ....Cheers

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vurbal

Staff Member

2 product reviews

6. May 2004 @ 13:07

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I used to use CCE SP a lot and I've tested out different quite a few different matrices in it, but as I said, other than seeing patterns of numbers it didn't mean much to me. I don't use it much now because the copy I had belongs to a school I'm not currently working for, and they thought they needed to have it back. I still get in to use it occasionally, but lately I've been using CCE Basic at home. Unfortunately that means no custom matrix capabilities.

Thanks for the information.

[ + quote]

Rich Fiscus
@Vurbal on Twitter
AfterDawn Staff Writer

This message has been edited since posting. Last time this message was edited on 6. May 2004 @ 13:10

afterdawn.com > forums > archived forums > mpeg-1 and mpeg-2 encoding (avi to dvd) > hvs matrices for mpeg2 encoding


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