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Encoder Master

10-23-2003 06:46 AM

KVCD: Which GOP for Cartoons?

I've read in the KVCD Spezification the best GOP for Cartoons is 15 Frames for PAL.
But in one thread kwag has written 12 Frames for Pal.

Quote:

For Anime/Cartoon material:
Same as DVD clean material, but shorten the GOP to 12 frames (PAL) or 15 (NTSC)

http://www.kvcd.net/forum/viewtopic....e0f0985ff9e9e2
But what is correct?
Hope you can quickly help me?

kwag	10-23-2003 07:41 AM

For PAL, use 12 for cartoons.

-kwag

Edlund

10-23-2003 11:34 AM

Should I use 15 for NTSC?

jorel

10-23-2003 11:47 AM

yes, 15 for ntsc cartoons!
:)

Encoder Master

10-23-2003 12:51 PM

But the spezification say another. But when you say it I believe in you.

:D Thanx

jorel

10-23-2003 01:15 PM

Quote:

Originally Posted by Encoder Master

But the spezification say another. But when you say it I believe in you.

:D Thanx

ok Encoder Master,
but where is wrote different?
:?

please,post the link!

:wink:

CheronAph

10-23-2003 02:21 PM

http://www.kvcd.net/portal/articles.php?lng=en&pg=20

For animation, old cartoons, etc., we recommend a maximum GOP size of 12 pictures for NTSCFilm (23.973fps), 15 pictures for PAL (25fps) and 18 pictures for NTSC (29.97fps).
It's also recommended to set "Scene change detection", if the encoder permits.

jorel

10-23-2003 04:47 PM

thanks Cheron!

maybe Kwag change it later!
:wink:

Encoder Master

10-24-2003 12:12 PM

Quote:

It's also recommended to set "Scene change detection", if the encoder permits.

Only with cartoons or also another Movies?

kwag	10-24-2003 01:21 PM

The basic idea is to use a smaller GOP with cartoons, than with a regular movie.
Every movie is different, so you should make your own short tests, depending on the movie.
Just keep the GOP size about half the size of a regular movie, for cartoons.
If KVCD's GOP is normally 24, a value of around 12 will be ok for both NTSC and PAL.

-kwag

mistermickster

10-29-2003 11:11 AM

I think I've asked this question before, with no reply, but what effect does the GOP have :?:

kwag	10-29-2003 04:20 PM

Quote:

Originally Posted by mistermickster

I think I've asked this question before, with no reply, but what effect does the GOP have :?:

The shorter (up to a certain point!), will give you higher quality, at the expense of larger file size.
Too short, will give better quality, only if you increase the bitrate.
The best quality will be I frames only, with a bitrate of 50,000Kbps :mrgreen:

-kwag