KDVD: Max number in GOP?
Hi there,
I understand that KDVD has a GOP structure as 1-24-2-1-18 and KVCD is 1-24-2-1-24. Recently, I encoded a movie as 480x480 (Mpeg-2) with 1-24-2-1-24, Notch beta-1a Maxtrix, because I find 480x480 is much sharper than 352x480 (SKVCD). Anyway, I used the same video file (m2v) with an Audio stream (48Khz) and burnt it to DVD-R, it plays perfectly in my standalone DVD player. One thing to note, I used DVD Workshop to author. So, my question is that as long as the DVD authoring program accepts the Video stream with 1-24-2-1-24, will standalone DVD player play it correctly. If so, KDVD templates does not have to be set the Max number of GOP to 18 but use 24 instead. Will 24 give us more compression so that we have more space for longer movie? |
Re: Max number in GOP
Wow! I'll try as well and let you know. Using 24 will give more compression.
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Hi jamesp,
If you are also using 480x480, don't forget to patch it to 704x480 or 720x480 by DVD patcher. Otherwise, DVD authoring program may reject your m2v file. Waiting for you result.... |
This is great news syk2c11 :D
A GOP increase from 18 to 24 will indeed give much more compression. Probably the GOP size is a limitation imposed by the DVD standard, and some (most?) DVD authoring programs follow that rule. But then it doesn't mean that an MPEG file with a GOP of 24 won't play on a standalone DVD player :) If this is the case, we have to make more tests with more standalone players and see if this holds true 8) If it does, then I'll start encoding with a GOP of 24 all my KDVDs :mrgreen: ( And I might as well change the GOP on the template to 24 for the benefit of all :wink: ) -kwag |
Hi there,
I have encoded 4 complete movies with 1-24-2-1-24 (KDVD, full-D1), all burnt into DVD-R, all played perfectly in 4 different standalone players. Has anyone experienced any problem so far? |
I haven't had a chance to experiment with this. I would also like to know if more people have had luck with this, because if everyone can play mpegs created with a GOP of 24, I'll definitively make the change on the KDVD templates 8)
-kwag |
KDVD GOP with TMPGEnc
I've noticed that with the 18 GOP max setting, I only see 12 frames per GOP during encoding. When I set the GOP to 24, that's when I see it max at 18 frames per group.
I'm encoding from a DVD2AVI project file of a DVD. |
hi all,
I tried to encode with GOP 24, but Maestro and Scenarist doesnt support GOP more than 18. |
Is there a way to patch the MPEG header to tell author programs that th fila has a GOP 18 instead of 24?
Thanks |
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I'm not sure you can specify the GOP size as a "patcheable" argument in the stream. -kwag |
did you try 1-24-2-1-24 or 18 on HALF D1 template?
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In this GOP you don't need so much P-Frames so this gop have the sameeffekt on your Material: "1-21-2-1-24" Because you have max 24 frames in GOP. 1-I-Frame and 21 P-Frames and 2 B-Frames now the GOP begin from new |
My friends watch out!!!
It senseful that many DVD authoring apps. do got a SAFE GOP length limit! Because maybe the player you got on your own does play back them well, but imagine the situation you and all your friends sitting in a house different than yours and you bring your KDVDs so you and your friends could enjoy a nice video evening. And suddenly the KDVD won't play back well! So if encoding to KDVD this is an area where we should at least maintain the standard specs as much as we can. And ... the DVD media is getting cheaper and cheaper ... ;-) So just hang with your max GOP 15/18 and the compression is given enough to bring 2-3 Movies in a very good quality on DVD-R when encoding at 704x480(576) even including AC3 5.1 on each stream. Maybe now you'll see the compression factor as principal but next year when DVD-R medias will go below the 1 Euro / Dollar price you'll be unhappy with your already done GOP 24 encodings ;-) |
Cheaper or not, many friends or not, you are supposed to have the original DVD of all KDVD you do. :!:
Thus, wherever you want to do a movie evening, you can. I do not understand what is the difference with what existed before, with KVCD ? |
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I do got the originals .... don't worry. As I know you got kids too and .... you know what could happen when kids treat orig DVDs ? I do love kids and I want them to be happy when they come into my house and wanna watch some nice cartoons. But just in case ... I prefer do give them KDVDs as they are still good working backups. Quote:
But that's only my personal opinion and I shurely do not say that for general. That's just all I wanted to say above. |
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