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-   -   GOP Structure In KVCD Superior? (http://www.digitalfaq.com/archives/encode/475-gop-structure-kvcd.html)

Jellygoose 06-20-2002 01:24 PM

GOP Structure In KVCD Superior?
 
Hi Kwag...

This Is For You I guess...

I encoded a movie with your KVCD 352x288 PAL, and I noticed, that even with a max. bitrate of 1500 and a CQ of 75, it will still fit on a 700 MB
CD-R...

Then I tried to encode a movie with the KDVD Half-D1 PAL Template, and I noticed that the file sizes were REALLY big, compared to those encoded with KVCD... although I decreased the CQ to 53 and the max. Bitrate to 2000...

Could It Be that the GOP Structure of the KVCD template is just superior and produces lower file-sizes, compared to the KDVD Templates?

Could I just Use The GOP Structure of the KVCD templates with the KDVD Template for MPEG-2 ?

Rookie 06-20-2002 01:31 PM

Unfortunately no, DVD specifications are to rigid.

You cant really compare the filesize from the KVCD 352x288 to the KVCD Half-D1 template.
To get an real estimate how much the GOP structure influences the filesize import the GOP structure from the KDVD template into the KVCD template (or vice versa) and encode again.

Rookie

Jellygoose 06-21-2002 09:45 AM

Don't Care
 
Sorry, I think you didn't get my point...

I don't care about DVD Specifications because i just want to create an SVCD...

So do you think that the KVCD GOP Structure would work with the KDVD Template?

kwag 06-21-2002 11:59 AM

Re: GOP Structure In KVCD Superior?
 
Quote:

Originally Posted by Jellygoose
Hi Kwag...

This Is For You I guess...

I encoded a movie with your KVCD 352x288 PAL, and I noticed, that even with a max. bitrate of 1500 and a CQ of 75, it will still fit on a 700 MB
CD-R...

Then I tried to encode a movie with the KDVD Half-D1 PAL Template, and I noticed that the file sizes were REALLY big, compared to those encoded with KVCD... although I decreased the CQ to 53 and the max. Bitrate to 2000...

Could It Be that the GOP Structure of the KVCD template is just superior and produces lower file-sizes, compared to the KDVD Templates?

Could I just Use The GOP Structure of the KVCD templates with the KDVD Template for MPEG-2 ?

The KDVD template is designed for DVD's. Not for CD-R's. Also the GOP has a fixed max frames of 15 PAL, 18 NTSC, because it's a requirement for DVD compliance. That's why you don't get that much compression. Also the audio is set at 192 with a 48Khz sampling instead of 44.1

You can change the max number of GOP's from 15/18 to 48/50 and lower the audio if you want to put it on a CD-R.

kwag


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