Section: DVDAuthor Man Pages (1)
Updated: 31 January 2005
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dvdauthor - assembles multiple mpeg program streams into a suitable DVD filesystem
dvdauthor [ -o output-dir ] -x xml-config-file
dvdauthor [ -o output-dir ] [ -j | --jumppad ] [ -T | --toc ] [ menu or title options ]
At a high level, a DVD is a collection of menus and titles.
Conceptually, a menu contains buttons which can be assigned actions
and provides a list of choices to the end user, while a title contains
the main content of the DVD. However, in reality many of the features
available in menus (including buttons, pausing, and looping) are also
available in titles.
The menus and titles are divided into titlesets and the VMGM menu set.
A titleset can contain a number of menus and titles which are meant to
act together. The "menu", "audio", "subtitle", and "angle" buttons on
the DVD player's remote control will all access menus in the same
titleset as the title which is being played. All the titles and menus
of a given titleset have the same video, audio, and subtitle settings
(the definitions for the menus are independent from the definitions
for the titles), so if you want to have different settings (for
example widescreen vs standard aspect ratios), then you need separate
titlesets. Titlesets are not meant to jump to one another, so the
VMGM menu domain is used. It is a collection of menus (no titles)
that can access the menus and titles of all the titlesets.
One of the most frusterating things when deciding how to author a DVD
is that there are often many ways to accomplish the same task. For
example, you must decide whether to locate menus at the VMGM level or
the titleset level. A typical setup is to locate the high level menus
at the VMGM level, and the low level configuration menus (scene /
audio / subtitle selection) at the titleset. If there are DVD extras,
perhaps with a lower quality audio track and a 4:3 aspect ratio, then
they would be in a separate titleset with a menu to select among the
extras located at the titleset level.
dvdauthor works in discrete operations. It
authors each titleset one at a time, and then finally authors the VMGM
to complete the disc. At that point the contents can be written out
to a DVD. If you are controlling dvdauthor with
command line arguments, then each step will occur independently;
however if you are using the XML configuration file, then you have the
option of combining some or all the steps into one.
The VOBs passed to dvdauthor must have DVD
NAV (VOBU) packets multiplexed in at the correct locations. Many
tools can do this, including mplex from mjpegtools
1.6.0 or later. dvdauthor will then fill these
packets in with the correct data. Special care has been taken to
ensure dvdauthor is fifo compliant; that is every
source VOB can be the output of another program (such as
mplex). This can make execution faster on many
systems by avoiding extra filesystem accesses.
COMMAND LINE DESCRIPTION
- -o output-dir
The destination directory to store the DVD-Video file structure in.
Creates a menu.
Creates a title.
- -v video-opts
A plus (+) separated list of video options. Dvdauthor
will try to infer any unspecified options. pal, ntsc, 4:3, 16:9,
720xfull, 720x576, 720x480, 704xfull, 704x576, 704x480, 352xfull,
352x576, 352x480, 352xhalf, 352x288, 352x240, nopanscan, noletterbox.
Default is ntsc, 4:3, 720xfull
- -a audio-opts
A plus (+) separated list of options for an audio
track, with each track separated by a comma (,). For example -a
ac3+en,mp2+de specifies two audio tracks: the first is an English
track encoded in AC3, the second is a German track encoded using
MPEG-1 layer 2 compression. ac3, mp2, pcm, dts, 16bps, 20bps, 24bps,
drc, surround, nolang, 1ch, 2ch, 3ch, 4ch, 5ch, 6ch, 7ch, 8ch, and any
two letter ISO 639 language abbreviation. Default is 1 track, mp2,
20bps, nolang, 2ch. 'ac3' implies drc, 6ch.
- -s subpicture-opts
- -e entry(s)
- -p palette-file
- -i commandlist
- -c chapterpts
- -f mpeg-file
- -b buttondef
Here is the basic structure of the configuration file:
<dvdauthor [dest="output-dir"] [jumppad="1|on|yes"] >
<menus [lang="language-code"] >
<video [format="ntsc|pal"] [aspect="4:3|16:9"]
<audio [format="mp2|ac3|dts|pcm"] [channels="numchannels"]
[samplerate="48khz|96khz"] [lang="language"] />
[<audio ... />]
<subpicture lang="language" />
<pgc [entry="title"] [palette="yuvfile|rgbfile"]
<pre> commands; </pre>
<vob file="file.mpg" [chapters="chapter-list"]
[<vob ... />]
<button [name="buttonname"]> commands; </button>
[<button ... />]
<post> commands; </post>
[<pgc ... />]
[<video ... />]
[<audio ... />]
[<pgc ... />]
[<video ... />]
[<audio ... />]
<pgc [palette="yuvfile|rgbfile"] [pause="seconds|inf"]>
[<pgc ... />]
[<titleset ... />]
A breakdown of the config file:
- <dvdauthor [dest="output-dir"] [jumppad="1|on|yes"]>
Initiates dvdauthor. dest denotes the directory where dvdauthor will write the files. It overrides the -o option. Contains up to one <vmgm> tag and any number of <titleset>'s.
Constructs of a VMGM level menu set or a title set.
Contains up to one <menus> tag and if a
titleset, up to one <titles> tag.
- <menus [lang="language-code"] >
Marks the list of menus or titles for this VMGM menu
set or titleset, called in dvdauthor terminology a
"pgcgroup." Contains up to one <video> tag,
up to eight <audio> tags, up to 32
<subpicture> tags, and any number of
- <video [format="ntsc|pal"] [aspect="4:3|16:9"] [resolution="XxY"] [caption="field1|field2"] [widescreen="nopanscan|noletterbox"] />
Manually configures the video
parameters for this pgcgroup. If any of these are not set, then they
will be inferred from the source stream. Note that the DVD format
only specifically supports 720x480, 704x480, 352x480, and 352x240
resolutions for NTSC, and 720x576, 704x576, 352x576, and 352x288
resolutions for PAL, but DVD author will accept a wider range of
inputs and round up to the nearest size.
- <audio [format="mp2|ac3|dts|pcm"] [channels="numchannels"] [dolby="surround"] [quant="16bps|20bps|24bps|drc"] [samplerate="48khz|96khz"] [lang="language"] />
Manually configures an audio channel for this
pgcgroup. List once for each channel. Most parameters are inferred
automatically from the source VOBs except for PCM parameters.
However, language must be manually specified. Note that it is
possible to just list the language attribute and let
dvdauthor fill in the rest.
- <subpicture lang="language" />
- <pgc [entry="entries"] [palette="yuvfile|rgbfile"] [pause="seconds|inf"]>
A PGC is just a fancy term for either a menu or a
title. It has a special meaning in the DVD spec so I have retained
its use here. PGC's can have commands that get executed before they
start playing or after they finish; see pre and
post tags below.
If the PGC is a menu, you can specify one or more entries for
it. This means that if you press the corresponding button on your DVD
remote, then it will go to this menu. For a VMGM level menu, the only
choice is title, which on my remote corresponds to
the top menu button. For a titleset level menu,
you can use root, subtitle, audio, angle, and ptt. If you want more
than one, separate them by a space or a comma. Note that
root entry is meant for commands that jump from a
VMGM level menu to a titleset menu.
All button and menu masks and all subtitles within a PGC must
share the same 16 color palette. If you use spumux
to generate the subtitle/subpicture packets, then the color
information will be automatically passed to
dvdauthor; however, if you use another subtitler or
want to have more control over the palette, you can manually specify
it with the palette attribute. The first 16
entries of the file should be the 16 colors of the palette, listed as
6 digit hexadecimal numbers representing either the RGB breakdown (if
the filename ends in .rgb or the YUV breakdown (if
the filename does not end in .rgb. After that, the
button group information can be listed as pairs of 8 digit hexadecimal
numbers; up to three button groups may be specified.
If you have a short video sequence or just want the video to
pause at the end, you can use the pause attribute
to set the number of seconds (as an integer) from 1 to 254. If you
want the video to pause indefinitely, use
- <pre> commands; </pre>
- <post> commands; </post>
Sets the commands to execute before or after a PGC
plays. It can be used to loop the current video (by having a
<post> jump ... </post> sequence), or to
conditionally skip certain chapters if a flag has been set.
- <vob file="file.mpg" [chapters="chapter-list"] [pause="seconds|inf"] />
- <cell [start="timestamp"] [end="timestamp"] [chapter="1|on|yes" | program="1|on|yes"] [pause="seconds|inf"] />
- <button [name="buttonname"]> commands; </button>
The language is quite simple and roughly looks like C.
Statements are terminated with a semicolon.
Statements can span multiple lines.
Multiple statements can appear on one line.
Whitespace (space, tab, newlines) are not important, except to separate keywords and identifiers.
The DVD virtual machine processes 16 bit values. It supports up
to 16 general purpose registers; however dvdauthor
reserves 3 for internal use. Thus register 0-12 are avaialable for
use and are referred to as g0 through
There are also 24 system registers, which can be referred to as
s0 through s23. Not all of
these can be set. Many of these have pseodonyms.
- audio (s1, rw)
audio channel, ranging from 0-7.
- subtitle (s2, rw)
track, ranging from 0-31. If you want the subtitle to always be
displayed, then you should add 64 (i.e. choose 64-95). Simply
selecting the track (0-31) means that only the forced subtitles will
be displayed, whereas enabling the track (64-95) means that all the
subtitles will be displayed. This allows you to have forced subtitles
only for the parts of the movie where the actors are speaking a
foreign (to the viewer) language, but still have normal subtitles for
the hearing impaired. The hearing impaired viewers would enable the
track (64-95) while the other viewers would just select the track
(0-31) they would be able to share the
- angle (s3, rw)
angle (currently untested).
- button (s8, rw)
currently highlighted button. Note that the value is multiplied by
1024, so the first button is 1024, the second is 2048,
Expressions follow typical C syntax except that booleans are not
convertible to integers and vice versa. Operators and comparisons
==, !=, >=, >, <=, <, &&, ||, !, eq, ne, ge, gt, le, lt, and, or, xor, not, +, -, *, /, %, &, |, ^
Since the code is encapsulated in XML, the parser will catch any
unescaped < characters, thus alphabetic mnemonics have been
provided for all comparison operators for consistency.
Blocks are either a single statement (terminated by a
semicolon), or a group of statements wrapped in curly braces. For
jump vmgm menu 3;
The statements supported are fairly simple at the moment.
Sets a variable equal to the result of an equation.
- if (EXPRESSION) BLOCK;
- if (EXPRESSION) BLOCK; else BLOCK;
Calculates the expression; if true, then it executes
the block of code.
- jump TARGET;
- call TARGET [resume CELL];
Jumps to a particular title or menu, or calls a
particular menu, or returns to the calling title. You can only
execute a call from a title to a menu; all other forms are illegal.
The purpose of using call instead of
jump (besides the fact that they support a mutually
exclusive list of targets) is to allow the menu to return to the point
in the title where the call originated using
resume. You can manually specify the return cell
by using the resume keyword, however if you do not
specify one and you use the command in a post instruction block, then
it will presume cell 1.
The following are possible targets:
- [vmgm | titleset X] menu
- [vmgm | titleset X] menu Y
- [vmgm | titleset X] menu entry Z
Targets either the default menu, a menu number Y, or the menu denoted as the entry for Z. The menu is in either the VMGM or titleset domain. If you wish to target a menu in the current domain then you can omit the domain moniker.
- [vmgm | titleset X] title Y [chapter Z]
Targets a title, or a chapter in a title. Numbering
starts at 1. All of the titles on the disc are accessible in the VMGM
domain, or you can access them by titleset
- chapter Z
- program Z
- cell Z
Targets a chapter, program, or cell in the current
title or menu (note that menus do not have chapters). You can use
this to create looping menus: jump cell
- DVD BACKGROUND
- DVDAUTHOR DESCRIPTION
- COMMAND LINE DESCRIPTION
- XML DESCRIPTION
- LANGUAGE DESCRIPTION
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