status

[Udo-12]

Hello,

What is the current status of the tools for creating
DVD-A's and similar discs? WHat works, what doesn't
and what is new?

I've been busy the past few weeks but I'll have time
in december to check things out in more detail again
in december.

Does anybody know if the current code allows for
gapless discs (gapless playback) on the non-gapless
players like my NAD T-524? (DVD-V is gapless of
course, but DVD-A isn't....)

Kind regards,
Udo


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[Fabrice Nicol]

Hi Udo,

sorry for being a bit lazy of late.

Here is the info you requested:

- tool status: everything is reported to work, for core usage at least.
- Reported issues :

 *dvda-author
  memory leaks, minor security issues, and crashes linked to audio size (see
the patch by Kai-Uwe)

 *Hplex
   - with the latest version, the set of switches -a folder -v folder does
not work.
   - Hplex Light GUI uses %1 and not "%1" which causes crashes with
filepaths containing spaces.

- Agenda

 * Hplex Light GUI
   a patch has been written and compiled, waiting for upload (sourceforge
ftp server has been jammed today)

 * Hplex
   translation to C delayed to 2008 (10 %)

 * dvda-author
   I'm doing deeper changes than first considered. While I first intended
just to implement zone-to-zone nav
   (which is about done), I'm now redesigning the interface, adding flags
for better integration of this app to other
   software. Also, I'm doing quite a few memory tests, as weaknesses have
been consistently reported.
   This has led me to postpone the next release to end on year (about).

- Gapless issues

  Ahhh...on this I was expecting you, Udo, and your now famous NAD player.
  The project website just tells part of the whole story, which is complex
and confusing.
  To make a long story short, here is where I stand on the issue:


    > DiscWelder has a "gapless" option which enforces smooth playback.
While the trick works, what the website says is that      it is for the most
part a commercial trick: there's to "gapless" trick about gapless tracks. If
you do hex comps on the system structure (.IFO files) you'll see for
yourself that DiscWelder just makes two distinct titles (=tracks) for
non-gapless tracks, while it makes just one title for "gapless tracks". In
the former case, you get 0x02 at the start of the second sector of
AUDIO_TS.IFO, in the latter you get 0x01.

    > Now, if your carefully examine Dave's code, you'll see that
dvda-author was written and intended to be gapless. Unlike DiscWelder,
dvda-author does not have the option of making two distinct titles when the
audio characteristics of two consecutive files are the same: it forces the
gapless option on users. This is going to change in future versions,
incidentally. So, dvda-author-made discs should be nearly gapless on your
NAD. They are on my Pioneer, as I emailed you over the summer.

   > NEARLY, yet not quite, for some players. And here is the rather
confusing part of the story, which was not mentioned on the website :
compared to dvda-author, DiscWelder uses "shortened" PTS length coding from
the second (gapless) track onward, wrt the PTS length coding of the first
track (which is the same as with dvda-author's).
    As the AOB streams made by DiscWelder and dvda-author are bit-identical,
there's reason to believe that these shortened PTS length fool dvdplayers
into shortening the transition between two tracks. While my Pioneer does not
need that, it might be the case that your NAD does.


Example:

one wav files cut into two tracks at zero crossing to avoid glitches.

audio char: 24 bits / 96 kHz
One-title group, two chapters ("tracks").
DiscWelder "gapless mode"


                        DiscWelder dvda-author

ATS_O1_1.AOB identical, size = 0xB66FF0

SAMG pointer differences (does not bear on the issue)
                        same group/chapter/PTS stamp/C8-48/format encoding

     PTS length 0x41 DB FF 0x41 DC 01 , track #2 (same PTS length for track
#1)


AMG
     PTS length   0x8E9E01 08E9DFF, PTS of whole title.

Listening experience on my Pioneer: both gapless.



  > Lastly: with Lplex-made video zone, my Pioneer plays back a noticeable
gap.
    Although I'm unsure about the details, this is probably linked to
padding techniques (remarkably) used by Bahman Negahban to align video and
audio streams. See "Explanatory note" 1 on website, AUDIO_TS.IFO


Hopefully my reply wasn't too long.

Very interesting contributions over the past few days!

Best,

Fab



-----Message d'origine-----
De : dvd-audio-devel-bounces@...
[mailto:dvd-audio-devel-bounces@...]De la part de udo
Envoye : samedi 17 novembre 2007 19:30
A : dvd-audio-devel@...
Objet : [Dvd-audio-devel] status


Hello,

What is the current status of the tools for creating
DVD-A's and similar discs? WHat works, what doesn'tt
and what is new?

I've been busy the past few weeks but I'll have time
in december to check things out in more detail again
in december.

Does anybody know if the current code allows for
gapless discs (gapless playback) on the non-gapless
players like my NAD T-524? (DVD-V is gapless of
course, but DVD-A isn't....)

Kind regards,
Udo


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______________
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http://www.yahoo.com/r/hs

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[Udo-12]

--- Fabrice Nicol <fabrni@...> wrote:
(...)
>     As the AOB streams made by DiscWelder and
> dvda-author are bit-identical,
> there's reason to believe that these shortened PTS
> length fool dvdplayers
> into shortening the transition between two tracks.
> While my Pioneer does not
> need that, it might be the case that your NAD does.

I'd like to test!
I have a small holiday so I can spend some time on
this.

> Example:
(...)
>
> Listening experience on my Pioneer: both gapless.

We must make a small test-disc and put this online to
see what effect different methods have on our players?

> Hopefully my reply wasn't too long.

No, to the contrary: very interesting!
Is this test-disc possible?
When teh structure is known and the audio carefully
chosen the gap-issues (or absency of those) must be
easy to spot.

Kind regards,
Udo


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