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TO:
All NDA Contractors of DVD Specifications for Read-Only Disc
DVD Format Verification Lab.
Tokyo
(Toshiba) Laboratory
Tokyo (Sony) Laboratory
Osaka (Matsushita) Laboratory
Dear Sirs,
It is pleased to inform you that DVD Video Disc title has reached
286 titles, including the one that will be announcing shortly,
in the Japanese market and 191 titles in the US. market. Such
DVD disc titles show that a full-scale expansion for a year-end
sale has been progressing.
On releasing "DVD Format Verification News" File No. 004, we have
been describing on Disc and Player problems, so far, we would
be much obliged if you, who have been getting involved with the
development of Players and Disc, would kindly make use of it so
that you can avoid quality problems on DVD Format at the time
of a full-scale start -up of the market.
Furthermore, please find supplemental descriptions on "Audio Specifications
for DVD-Video" attached, since it has been announced from DVD
Forum Steering Committee. You have access to those information
with home page of Inter net. For your convenience, it is (http://eiplaza.toshiba.co.jp/dvd/eindex.htm)Technology.
We would like to conclude our compliments of releasing "DVD Format
Verification News" File No. 004.
Thank you.
Sincerely,
Tokyo
(Toshiba) Laboratory
Director : Hisashi Yamada ( Fax : +81-3-5444-9430)
Tokyo (Sony) Laboratory
Director : Jun Yonemitsu (Fax : +81-3-5488-6499)
Osaka (Matsushita) Laboratory
Director : Asaichi Akagi (Fax : +81-6-909-5027)
(Notes 1) : Distribution of DVD Format Verification News is restricted
to NDA Contractors of DVD Specifications for Read-Only Disc, therefore,
the disclosure of information described in this newsletter is
prohibited.
(Notes 2) : This newsletter is edited in accordance with the information
related to Format Verification in a Japanese market. This is an
English translation of the Japanese version that has already been
distributed.
1.
Information on DVD Video Disc problems
We have conducted sampling on 15 titles of DVD Video Disc that
have been released in the Japanese market. 14 titles out of 15
titles have been found problems, and 356 bit allocation errors
have been found.
The objective here is showing you the test results by describing
major problem items and calls the attention of you to the analysis
on the problems and countermeasures to be taken at authoring studio.
No playback problems with commercially available DVD Video Players.
(1)
Test results : Refer to the table described below.
(2) Description of major playback problems
A.
Presentation : Errors on Buffer control AV synchronized signal
(a)
V 1259
Cause
PTS Exists in A _ PKT which has no first data of audio frame.
Description
PTS is input in a backet although no first data of audio frame
exists. It is assumed that process for PTS, DTS has errors.
Effect
Playback problems (freezed picture of video/ skip, audio mute
etc .) might be dependent on players due to AV synchronized
signal disorder.
Specifications
ISO/IEC 13818-1
(b)
V 6002
Cause
Buffer Management is wrong.
Description
Stream that can not provide playback with MPEG decoder model
(P_STD). It is assumed that something is wrong with buffer
control algorithm of encoder.
Effect
Playback problems might be dependent on players due to under
/ over flow of decoder buffer .
Specifications
p. V13-89 and ISO / IEC 13818-2
(c)
V 6005
Cause
Transfer rate is greater than MAX _ Vo.
Description
Transfer rate for decoder is greater than 10.08Mbps.
Time
interval for error SCR (first Pack) is required.
Countermeasures
might be taken by setting transfer rate smaller than 10.08Mbps
in case that it can be set in encoder.
Effect
Playback
problems might be dependent on players due to under flow of
decoder buffer.
Specifications
p.
VI5-1 and ISO / IEC 13818-1
(d)
V 2001
Cause
Relation
of PTS and DTS is wrong.
Description
Relation of PTS, DTS is wrong. It is assumed that process
for PTS, DTS of encoder has errors.
Effect
Playback problems might be dependent on players due to decode
/ display timing disorder with video decoder.
Specifications
ISO / IEC 13818-1
B.
UDF (File)
(a)
U610/710/810/910
Cause
"Volume
Descriptor Sequence Number" of each descriptor in Volume Descriptor
Sequence of UDF has errors.
Description
"Volume
Descriptor sequence Number " that is described above shall
be identical.
eg.
LSN Volume Descriptor (VDSN)
------+-----------------------------------------------------------+-------
Main Volume Descriptor Sequence
32 Volume Descriptor (0)
33 Implementation Use Volume Descriptor (1)
34 Partition Descriptor (2)
35 Logical Volume Descriptor (3)
36 Unallocated Space Descriptor (4)
Reserve Volume Descriptor Sequence
48 Primary Volume Descriptor (0)
49 Implementation Use Volume Descriptor (1)
50 Partition Descriptor (2)
51 Logical Volume Descriptor (3)
52 Unallocated Space Descriptor (4)
Setting described above is acceptable. Other setting that
is identical is OK.
eg.
LSN Volume Descriptor (VDSN)
------+----------------------------------------------------+-------
Main Volume Descriptor Sequence
32 Primary Volume Descriptor (0)
33 Implementation Use Volume Descriptor (0)
34 Partition Descriptor (0)
35 Logical Volume Descriptor (0)
36 Unallocated Space Descriptor (0)
Reserve
Volume Descriptor Sequence
48 Primary Volume Descriptor (0)
49 Implementation Use Volume Descriptor (0)
50 Partition Descriptor (0)
51 Logical Volume Descriptor (0)
52 Unallocated Space Descriptor (0)
Setting described above that is not identical is an error.
Specifications
ISO/IEC 13346 3/8.3
ISO/IEC 13346 3/8.4.1
DVD-ROM Part 2 1.3.31
Effect
Errors
described above do not affect on DVD-ROM driver that employs
ISO 9660. As a matter of fact, errors described above do not
affect on DVD-Video Player that employs UDF.
(b)
U9661
Cause
File ID of ISO 9660 has problems.
Description
File ID of ISO 9660 is "VIDEO TS.BUP;1" in case of "VIDEO
_ TS.BUP" file.
However," ;1" is missing from file ID and sometimes only "VIDEO
_ TS. BUP" is left as file ID of ISO 9660.
";"
of file ID is called separator 2, and "1" of file ID is called
version.
Those ones are essential for file ID of ISO 9660.
No problems if it is positive integral number that is smaller
than 32767.
Specifications
ISO 9660 7.5
Effect
Those errors described above do not affect on DVD Video Player
that employs UDF. It is dependent on driver that does not
interpret file name properly in case that DVD-ROM Drive employing
ISO 9660.
C.
Navigation
(a)
N 1417
Cause
Jump for PGC, that does not exist, has been specified.
Effect
No guarantee for player operation. In many cases, it is treated
as No command or operation will be terminated.
Specifications
p. V14-199, p. V14-265
(b)
N 1307
Cause
It shall be 1b, but is it 0b?
Description
V _ BWD _ Exist 2 in FWD It shall indicate whether video data
exists between the VOBU to be presented just before the predecessor
and the first VOBU in the Cell, when BWDAn is 3fffffffh.
Specifications
V _ BWD _ Exist 2 in BWDIn.
Effect
Operation with players might be changed in case of jump-in
or special playback with special program such as still picture
program.
D.
NV Pack
(a)
N 1207
Cause
Any of field (described by a number after #)of VOBU _ 1st
REF _ EA, VOBU _ 2ND _ REF _ EA, VOBU _ 3RD _REF _ EA has
errors.
End
data that includes applicable picture to be referred to is
not included in a packet described in this field.
Effect
Parts of the picture displayed in the screen might be deformed
or the picture might not be displayed in case of special playback
such as forward scan or backward scan.
(b)
N 1029
Cause
VOBU _ SE _ E _ PTM field, that indicates still picture existence,
has errors.
Description
In case that sequence _ end _ code exists, the field does
not have value which we expect.
Effect
Normally, those errors described above do not affect seriously
on players. It is dependent on player that still picture might
disappear soon after it is displayed in the screen.
Specifications
VOBU _SE _ E_PTM in 4.4.1 PCI _ GI
E.
Sub Picture
(a)
SP 265
Cause
STA _ DSP is described in SPU while HL is valid.
Description
STA _ DSP can not be described in SPU that is valid for HL.
Effect
It is dependent on players whether display obeys SPU command
or HLT command.
Specifications
ANNEX L : Restrictions of SP _ DCCMDs.
(b)
SP 93
Cause
SPU display crosses over Cell.
Description
Sub-picture is not be displayed with crossing over Cell.
Effect
It is dependent on players that SPU might be continuously
displayed with cell crossing over Cell.
Specifications
5.1 Contents of VOB; Table 5.1-1 Restriction on each element.
"DVD
Video Verifier DVD-NF010VE Version 0.9.2" is provided with charge
by Osaka (Matsushita) laboratory as Verification Tools to detect
bit allocation errors that have been described in this newsletter.
For further information in this matter, please contact Osaka laboratory.
2.
Information on DVD Video Player playback problems
The objective here is showing DVD Video Player playback problems
and make the most use of them for verification of player to determine
as to whether it is DVD Format compliant one in case that it is
developed in the future time.
The following are countermeasures that can be taken by discs.
We would appreciate it if the person who gets involved in authoring
and contents provider would kindly avail to those information
described below. For further information, please contact each
Format Verification Laboratory.
(1)
ID No. : 104016
Description
of playback problem of Disc
VGM /VTS Menu exists with multi menu language. Among those,
language menu of which LMGM/VTSM _ LU_SA is not a multiple
of eight. And VMGM/ VTSM _ PGCI _SPTR is recorded with crossing
over sector.
Phenomena
of playback problems
It unable to operate if you operate Menu Key during title
playback.
Countermeasures
to be taken with disc
VMGM/VTSM _ LU_SA is to be a multiple of eight in case that
you make VMGM/VTSM of multi Menu language.
Problems can be avoided by making VMGM/VTSM_LU a multiple
of eight after adding PGCI that is not be executed.
(2)
ID No. : 104017
Description
of playback problem of Disc
Disc that can be transferred from angle number n title to
angle number m title with navi command. And the disc meet
the following formula. n > m
Phenomena
of playback problems
Multi angle cell can not be played back. If you try to play
back the Cell, hang-up might occur.
Countermeasures
to be taken with disc
Angle number SPRAM (3) is to be set less than m in case of
menu call from angle number n title to angle number m, or
the transfer is to be made with navi command.
(3)
ID No. : 104018
Description
of playback problem of Disc
Disc that exists huge number of title and PTT number in VTS.
Phenomena
of playback problems
Title with greater number in VTS can not be played back. And
if you try to play back those titles with greater number,
hang-up might occur.
Countermeasures
to be taken with disc
Total of title number and PTT number in the same VTS shall
be less than 510.
(4)
ID No. : 104019
Description
of playback problem of Disc
Disc that pre-command has been described in dummy PGC that
PTT is set.
Phenomena
of playback problems
Stream
that can not be played back since pre-command is not be executed.
Countermeasures
to be taken with disc
Command
can be described in post-command in case of dummy PGC of first
PTT.
(5)
ID No. : 104021
Description
of playback problem of Disc
In case that from first PGCI to end C _ PBI is greater than
2048bytes.
( The number of Cell is large.)
Phenomena
of playback problems
Cell that cannot obtain C _ PBI will be unable to operate
since it is not be played back.
Countermeasures
to be taken with disc
Total
capacity of information from first PGCI to end C _ PBI shall
be less than 2048 bytes. In case that total volume is greater
than 2048 byte PGC is to be separated. As for the number of
Cells that can be set, refer to the supplemental description.
Supplemental
Description
The following are PGCI structure.
| Less than 2048 byte |
PGC_GI |
|
236 bytes |
| PGC_CMDT |
8+8x CMD_Ns |
1032 bytes max |
| PGC_PGGMAP |
1 x PG_Ns |
99 bytes max |
| C_PBI |
24 x C_Ns |
6120 bytes max |
| |
C_POSI |
24 x C_Ns |
1024 bytes max |
From first PGCI(PGC _ GI) to end C _ PBI shall be less than
2048 bytes.
In case that you do not have any commands, namely, PG _ Ns=1,
maximum number of Cell is 75. [2048 - (236+1+0)] / 24 =75.4
The greater number of PG _ Ns you have, the less Cell you
will have for registration.
(6)
ID No.: 104022
Description
of playback problem of Disc
Disc that the same multi C _ IDN Cell exist in one PGC.
Phenomena
of playback problems
It might be unable to operate.
Countermeasures
to be taken with disc
Do not have the same multi C _ IDN exist in one PGC.
Supplemental
Description
In case that the same multi C _ IDN Cell exist , Cell that
is actually played back is considered as CN=1, it is indicated
CN=3 though. As a results, it might be unable to operate.
These are phenomena when the same multi C _ IDN exsist in
one PGC.
|
CN=1
|
C_IDN=1
|
|
CN=2
|
C_IDN=2
|
|
CN=3
|
C_IDN=1
|
|
CN=4
|
C_IDN=2
|
(7) ID No. : 104023
Description
of playback problem of Disc
Cell number exists greater than 16 with LinkCN command.
Phenomena
of playback problems
The wrong Cell is played back or it might be unable to operate
in case that greater than 16 Cell numbers have been specified.
Countermeasures
to be taken with disc
Maximum value of Cell number of LinkCN shall be 15.
LinkPG shall be used instead of LinkCN command when the Cell
Number is greater than 15.
(8)
ID No. : 104024
Description
of playback problem of Disc
In case that sub-picture is set to OFF and it is set to SPRAM
(2)= 0 - 31.
Phenomena
of playback problems
Sub-picture,
that is commanded that forced display is to be made, is not
displayed.
Countermeasures
to be taken with disc
Turn
off the sub-picture with command and set to SPRAM (2 )=63
in case of forced display.
(9)
ID No. : 104025
Description
of playback problem of Disc
Disc whose physical sector address of VOB is greater than
those value described below.
Single Layer : 260,000h
Dual Layer : 230,000h
Phenomena
of playback problems
The address that has value greater than those described above
can not be played back or you will have phenomenon that time
indication dose not proceed.
Countermeasures
to be taken with disc
Maximum physical address of VOB shall be less than 260,000
h for Single Layer and shall be less than 230,00 h for Dual
Layer.
(10)
ID No. : 104026
Description
of playback problem of Disc
Seamless structured Cell with HLT whose Cell size is less
than 24 frames.
Phenomena
of playback problems
No reaction when you have a key operation by watching a screen.
Countermeasures
to be taken with disc
The minimum Cell size of seamless structured Cell with HLT
shall be less than 40 frames.
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