GOP numbers confusion?
 

Can someone please tell me if these are correct or wrong (shown in the order as Tmpgenc).

PAL

1
25
2
1
25

NTSC Film

1
24
2
1
24

NTSC

1
30
2
1
30

Looks correct to me.

There is no NTSC settings with "30". Use "24" either if you are encoding in 23.976 or 29.970.

Oh, you're right, forgot about that. In fact, you're better off using 24 as max GOP length in all cases since 25 will produce the same result (24-frame GOPs).

I was confused because of the below info.

Thanks for the replies.

Where did you find this ?

You can find this on the kvcd.net site, by "official specifications".

No-one never pointed that :!:

A GOP with 30 pictures is too long. I never noticed that this was indicated in the spec 8O

But perhaps I'm the only one that find this too long ?

not alone Phil, 30 is too long and give problems.
...a long time in a distant galaxy...
"Posted: Thu Jul 10, 2003 12:21 pm...
My "breathing" problems is caused for GOP 30 cos
if i adjust the Gop to 24 or 18,the sample "pulse" less. ..."
here: http://www.kvcd.net/forum/viewtopic.php?t=4972&start=0
(my 4th post)

and the conclusion....
"Posted: Fri Jul 11, 2003 2:40 am...
results changing the GOP values with same source size:...."
http://www.kvcd.net/forum/viewtopic....r=asc&start=16
(my 5th post here)

Thank you for your helpfull memory Jorel (as always :-))

Will stick to 24.

Thanks Phil.

A GOP size of 30 works great on 30fps AND action movies.
It you are encoding low action scenes or dramas, then use a GOP size of 24.
If you want to be 100% safe, go for a GOP of 24.
If you want BEST compression at 30fps, use a GOP size of 30 ;)

-kwag