What is the correct VBV setting for authoring DVD's?

kempodragon · 29th December 2004, 19:57

I need some help determining the correct VBV setting. Both TMpeg encoder and Tmpeg DVD author state the vbv is 224 kbs for DVD compliance. Yet when I looked at some of my DVD's with both Vobedit and Bitrate Viewer, both programs showed the VBV to be 112. Searching the forum, I came up with the same VBV setting on other people's analysis of their DVD's. What is going on? AFAIK, 112 is the setting for SVCD, yet it is being used in commercially produced DVD's.

mpucoder · 29th December 2004, 20:11

You are talking about MPEG-1, right? The confusion probably comes from the way the buffer size is specified in the sequence header, it is kilo-words not kilobytes. So if you look in VobEdit you will see 112, but that means 224KB.

kempodragon · 30th December 2004, 05:43

SVCD uses Mpeg-2. In the Tmpenc SVCD template, the VBV is set at 112 kbs while DVD is set at 224 kbs. Bitrate Viewer and Vobedit don't list the type of unit, only the value, which is why I was confused. It's those little details that'll trip you up every time. Look at what happened to Mars orbital mission. One group used the metric system in their calculations, while another used the English system!! Result, CRASH and BURN!!!

Arky · 30th December 2004, 13:12

Quote:

Originally posted by kempodragon
SVCD uses Mpeg-2. In the Tmpenc SVCD template, the VBV is set at 112 kbs while DVD is set at 224 kbs. Bitrate Viewer and Vobedit don't list the type of unit, only the value, which is why I was confused. It's those little details that'll trip you up every time. Look at what happened to Mars orbital mission. One group used the metric system in their calculations, while another used the English system!! Result, CRASH and BURN!!!

Lol - erm, I'm English, and I can sssure you that we use Metric (Millimetres, Kilograms, grams etc)- we haven't used the imperial system for many years, as a rule. It's the Yanks that use Imperial (Inches, pounds, ounces etc). The only exception is with Miles, which we do still use!

Back on topic, you would definitely set your encoder to use 224 for DVD purposes.

Arky ;o)

29th December 2004, 19:57	#1 \| Link
kempodragon Registered User Join Date: Feb 2002 Location: Biddeford, Me USA Posts: 167	What is the correct VBV setting for authoring DVD's? I need some help determining the correct VBV setting. Both TMpeg encoder and Tmpeg DVD author state the vbv is 224 kbs for DVD compliance. Yet when I looked at some of my DVD's with both Vobedit and Bitrate Viewer, both programs showed the VBV to be 112. Searching the forum, I came up with the same VBV setting on other people's analysis of their DVD's. What is going on? AFAIK, 112 is the setting for SVCD, yet it is being used in commercially produced DVD's.

29th December 2004, 20:11	#2 \| Link
mpucoder Moderator Join Date: Oct 2001 Posts: 3,530	You are talking about MPEG-1, right? The confusion probably comes from the way the buffer size is specified in the sequence header, it is kilo-words not kilobytes. So if you look in VobEdit you will see 112, but that means 224KB. Last edited by mpucoder; 29th December 2004 at 20:20.

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30th December 2004, 05:43	#3 \| Link
kempodragon Registered User Join Date: Feb 2002 Location: Biddeford, Me USA Posts: 167	SVCD uses Mpeg-2. In the Tmpenc SVCD template, the VBV is set at 112 kbs while DVD is set at 224 kbs. Bitrate Viewer and Vobedit don't list the type of unit, only the value, which is why I was confused. It's those little details that'll trip you up every time. Look at what happened to Mars orbital mission. One group used the metric system in their calculations, while another used the English system!! Result, CRASH and BURN!!!