Re: bugreport (3 bugs)

On 11/09/10 02:20, Jan Rafaj wrote:

> I'd like to report following problems with dvdauthor code git HEAD (commit
> 20e3578 , as of 20100510):

Always glad to see somebody is testing the Git source tree. :)

> STAT: Processing T.mpg...
> WARN: Skipping sector, waiting for first VOBU...
> WARN: Skipping sector, waiting for first VOBU...
> WARN: Skipping sector, waiting for first VOBU...
> (... repeating circa 179 times in total ...)
> WARN: Skipping sector, waiting for first VOBU...
> WARN: Skipping sector, waiting for first VOBU...
> WARN: Skipping sector, waiting for first VOBU...

These messages are always a bad sign.

> 3. ffmpeg used to cut particular short part out of the resulting PS

As Jorge Martinez Saez has pointed out, did you specify “-target 
pal-dvd” or “-target ntsc-dvd”?

> I want to avoid remuxing T.mpg at all cost. T.mpg has A/V perfectly
> in sync, plays in mplayer, xine, etc. - all I've tested with, and even
> when I put it on a medium as a bare file and then try to play it in my
> DVD player, it plays fine.

Your DVD player, like many recent ones, has the ability to play things
that are not DVD-Video discs. DVD-Video has specific requirements on the
layout of the MPEG program stream, including the presence of NAV PACKs
(what the above “waiting for first VOBU” messages are about). FFmpeg has
the ability to generate the right format, with placeholders that dvdauthor
can simply fill in; all you have to do is include one of the above -target
options.

>The sample 'T.mpg' MPEG PS I do tests on, including the dvdauthor.xml,
 > can be downloaded from ftp://ftp.unob.cz/pub/testcases/dvdauthor/ .

Thank you for that. Doing a quick look with mpeg2desc, it appears there 
is only one system header at the start, and it’s the wrong size: 
according to this <http://www.mpucoder.com/DVD/sys_hdr.html>, the length 
field should contain 18, not 12. That’s why the automatic insertion of 
NAV PACKs is not working.

> Problem 2 (ERR replies contradicting each other):
> =================================================
>
> (dvdauthor.xml content same as in the first case)
>
> $ dvdauthor --video=pal+16:9+720x576 -x dvdauthor.xml
> DVDAuthor::dvdauthor, version 0.6.18+.
> Build options: gnugetopt graphicsmagick iconv freetype fribidi fontconfig
> Send bug reports to<[email protected]>
>
> INFO: no default video format, must explicitly specify NTSC or PAL
> ERR:  Must first specify -t, -m, or -x.

Interesting point. The confusion arises because --video is actually part 
of the command-line alternative to the XML file, which is why they 
cannot be specified together.

Specify the format in the XML file (or as a user or system default as 
documented here <http://create.freedesktop.org/wiki/Video_Format_Pref>), 
and the problem goes away.

> # Problem 3 (dvdauthor refuses to create dvd without Video TitleSet Menu):
> ==========================================================================
>
> (note that this did work with dvdauthor 0.6.10)
>
> in dvdauthor.xml:
>
> <dvdauthor dest="/tmp/out">
>     <titleset>
>       <titles>
>         <video aspect="16:9" format="pal" />
>         <pgc>
>           <vob file="T.mpg" />
>         </pgc>
>       </titles>
>     </titleset>
> </dvdauthor>
>
> ERR:  no video format specified for VTSM
>
> This happens even though manpage clearly says that<titleset>  may contain
> UP TO ONE<menus>  tag (so if I wont specify a menu, it should proceed
> with authoring as well). So if I specify no<menus>, the bailout
> shouldnt happen.

Hmm. I added a call to the code to define the format for the titleset 
menu in the absence of a <menus> section, which is why you get the 
error. I’ll have to double-check to see if this is really necessary.

> (btw, it would be nice to include some more explanations about what these
> - for joe-blow user cryptic - messages really mean... I had to google up
> 'VTSM'.

DVDAuthor is very much a low-level tool. I have started putting together 
a compilation of all the information that is publicly-known about 
DVD-Video here <http://en.wikibooks.org/wiki/Inside_DVD-Video>, but it’s 
far from complete as yet.

> And when we speak about docs, it would be really nice to include
> the following intro with dvdauthor:
> http://radagast.bglug.ca/linux/dvd_authoring/dvd_authoring.html ; at least
> me found it extremely useful).

I would say there are some errors in that. There is no 99-chapter limit 
on a title. And “DVD” doesn’t officially stand for anything (for 
trademark reasons).

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