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Verification News (No 14) January 2002

TO: All NDA Contractors of DVD Specifications

January 2002
Dear Sirs:

We are pleased to provide you with DVD Format Verification News No.14. A new Class-A Laboratories have been established the Third Institute of Ministry of Information Industries of P.R.China, for expanding the DVD format verification activities. You can find their self-introduction in the followings.
Please make much effort to have your products compliant with DVD Specifications. We, all of 14 Class-A Laboratories will continue to provide necessary tools and services for verification.

Sincerely,

Class-A Verification Laboratories:

Tokyo (Hitachi) Laboratory
Fax:+81-3-3506-1603

Asia (ITRI) Laboratory
Fax: +886-3-5917531
+886-3-5832805

Asia (LG) Laboratory
Tel: +82-31-610-5335
Fax: +82-31-610-5355

Osaka (Matsushita) Laboratory
Fax: +81-6-6909-5027

Kyoto (Mitsubishi) Laboratory
Fax: +81-75-958-3731

North America (PDSC) Laboratory
Fax: +1-310-783-4849

Europe (Philips) Laboratory
Fax: +31-40-2732113
http://www.licensing.philips.com

Tokyo (Pioneer) Laboratory
Fax: +81-42-990-2831

Asia (Samsung) Laboratory
Tel: +82-31-200-5941
Fax: +82-31-200-8666

Tokyo (Sony) Laboratory
Fax: +81-3-5769-5890

Asia (Third Institute) Laboratory
Tel: +86-10-64363131
Fax: +86-10-64362324

Yokohama (Victor) Laboratory
Fax:+81-45-450-1639

North America (WAMO) Laboratory
Fax: +1-570-383-0328

Tokyo (Toshiba) Laboratory
Fax: +81-3-5444-9403

Table of Contents:
1. Introduction of TI DVD Verification Laboratory
2. Information of DVD Video Format Recorder Problem
3. Information of DVD Video Disc Problem
4. Information of DVD Audio Disc Problems
5. Remind of restrictions imposed on DVD-Video zone of DVD-Audio

1. Introduction of TI DVD Verification Laboratory

The Third Institute (TI) of MII of China is located in Beijing of China. TI DVD Verification Laboratory is a new Class A DVD Verification Laboratory.

China is a big country in terms of her production of DVD products, and at the same time China is also one of the biggest market places for DVD products in the world. DVD verification is, therefore, very important in China in order to ensure the quality as well as the compatibility and interchangeability of the products. Because of this, the preparation for the establishment of TI DVD Verification Laboratory was started by The Third Electronics Research Institute of the Ministry of Information Industry in March 2000 as proposed by the DVD Forum and strongly supported by the industry in China, and it was established in December 2000. In cooperation with and with the assistance of the laboratories of such as Matsushita, Taiwan ITRI and Hitachi, TI DVD Verification Laboratory has conducted format verification on DVD-Player and DVD-ROM products. Due to the active supports from the verification laboratories of Matsushita and etc. and also due to the efforts done by the laboratory itself, TI DVD Verification Laboratory was approved as a Class A Verification Laboratory during the SC meeting held in Japan on September 13, 2001. Since then its formal verification activities have been started, and its responsibilities as a Class A Verification Laboratory have been implemented.

The verification of DVD products in China is of very great importance. We wish that the establishment of the TI DVD Verification Laboratory would not be only for the purpose of verifying products, but we also wish that the verification laboratory would become a bridge and platform for technical exchange between domestic industries and the DVD Forum. TI DVD Verification Laboratory will provide consultation and technical services to domestic manufacturers and make its contribution to increasing the cooperation and technical exchange with big companies in the world, providing services for the development of the DVD industry.

Verification services provided are as follows:
DVD-Video Player
DVD-Audio Player (will be covered soon)
DVD-ROM Drive

Contact Person: Ms. Tian Yujing
Address: 7B North Jiuxianqiao Road, Chaoyang District, Beijing 100015 P.R.China
Tel: (010) 64363131 ext. 6848
Fax: (010) 64362324
E-Mail: dvg@263.net.cn dvg@public.bta.net.cn

Lab room

Verification tools (Books and Test discs)

Measurement

Product Shelf

2. Information of DVD Video Format Recorder Problem

(1) ID No. 114096
Some discs which are recorded with a video format recorder have the following problem.

< Description of disc problems>
The video attribute information (VMGM_V_ATR) is described as 704 x 480,
although a menu consists of the size of 720 x 480.

<Phenomena of playback problems>
A picture is adjusted to the standard position by 8 pixels due to the centering of the picture by the DVD Video player, which implements the playback based on the VMGM_V_ATR.
Since the location specified for the button of the main picture is arranged to the size of 720 x 480, the button is deviated from the location of the main picture.

<Requirements for production of discs>
The data of the VMGM_V_ATR is required to correspond to the size of the main picture.

3. Information of DVD Video Disc Problem

(1) ID No. 114097
Disc problems relating to MPEG Specifications

< Description of disc problems>
The "progressive_frame" of all frames is equal to "0", although the "progressive_sequence" is equal to "1" in the "Sequence_extension."

<Phenomena of playback problems>
Some players judge the recorded data as an error, and the picture does not appear since the player performs the skip operation during the playing back.

<Requirements for production of discs>
When the "progressive_sequence" is equal to "1" in the "Sequence_extension," only the "progressive_frame" is necessary to be equal to "1" in this sequence.
(Refer to "6.3.5 Sequence Extension" of MPEG Specifications.)

4. Information of DVD Audio Disc Problems

(1) ID No. 114098
<Description of Disc Problem>
Some video contents are not defined as an AVTT (Audio with Video Title) pointed by ATT_SRPT in AMG of a DVD-Audio disc, while those contents are defined as a TT (Title) pointed by TT_SRPT in VMG of the disc.
(ref. DVD-8. Video Contents for Audio with Video Title in DVD-Audio disc)
Every TT defined in DVD-Video zone of a DVD-Audio disc shall be pointed by ATT_SRPT in AMG of the disc.
<Phenomena of playback problem>
No VCAP (Video Capable Audio Player) can play back such video contents.

(2) ID No. 114099
<Description of Disc Problem>
An AVTT has no audio data stream.
(ref. DVD-8.2 Video Title Set (VTS) of DVD-Audio)
Number of Audio streams shall be one or two.
<Phenomena of playback problem>
Every VCAP outputs no audio data when it plays back the AVTT.

(3) ID No. 1140100
<Description of Disc Problem>
A VTS having VTSM is recorded in DVD-Video zone of a DVD-Audio disc.
(ref. DVD-8.2 Video Title Set (VTS) of DVD-Audio)
VTSM shall not be described.
<Phenomena of playback problem>
No VCAP is required to understand VTSM. As a result, any VCAPs can not guarantee to play back AVTTs whose presentation data are recorded in the VTS (Some VCAP might abandon to play back the AVTTs).

(4) ID No. 1140101
<Description of Disc Problem>
An AVTT is constructed as Multi-PGC_Title.
(ref. DVD-8.1 Video Manager (VMG) of DVD-Audio)
An AVTT shall be constructed as One_Sequential_PGC_Title.
<Phenomena of playback problem>
No VCAP can guarantee to play back the AVTT which composes of Multi-PGC_Title (Some VCAP might abandon to play back it). Especially, it is uncertain how a VCAP behaves at the execution of User Operation like "Skip".

5. Remind of restrictions imposed on DVD-Video zone of DVD-Audio
Video contents can be recorded in a VTS in DVD-Video zone of a DVD-Audio disc. They are not only defined as TT(s) but also defined as AVTT(s). A TT is a unit to be played back by DVD-Video player and the corresponding AVTT is the one played back by VCAP(Video Capable Audio Player) . Therefore, the specifications of the TT (AVTT) are the same as that of Part 3: VIDEO SPECIFICATIONS. But rules to apply the VIDEO SPECIFICATIONS to a DVD-Audio disc are defined in Part 4: AUDIO SPECIFICATIONS as restrictions for audio use. Please refer to Chapter 8: "Video Contents for Audio with Video Title in DVD-Audio disc" of the AUDIO SPECIFICATIONS for the detail. The followings describe a part of such restrictions, just for your reference.

<Examples of the rules>

Pre-Command, Post-Command, and Cell Command can not be used except "CallSS from TT_DOM to VMGM_DOM" command in Post-Command area, (The CallSS is for Navigation of a DVD-Video player. Every DVD-Audio Player shall ignore it.)
Button Commands can be used ( but some rule are added),
Cell Still and VOBU Still can not be used, etc.