From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: Insert #+BEAMER_HEADER_EXTRA before \begin{document}?
Date: Wed, 07 May 2014 19:26:26 -0400
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Suvayu Ali <fatkasuvayu+linux@gmail.com> writes:

> Hi Seb,
>
> On Wed, May 07, 2014 at 09:01:39PM +0200, Sebastien Vauban wrote:
>> Hello,
>> 
>> To insert a short title for a Beamer presentation, you can glean the
>> following answers on the Web:
>> 
>> - Using `#+BEAMER_HEADER_EXTRA' which -is- +was+ exported /after/ the
>>   `\title' command.
>
> I use this:
>
>   #+LATEX_HEADER: \subtitle{Some subtitle}
>
> I can confirm this worked with some version of 8.x, however I have not
> used it recently.
>

Are you sure it worked with beamer? AFAICT, it just adds a subtitle
to the title slide, nothing more. In particular, beamer does not seem
to use it for the purpose that Seb wants it: a (limited-length) marker
on each slide.

Tested with this:

--8<---------------cut here---------------start------------->8---
#+LaTeX_CLASS: beamer
#+LaTeX_CLASS_OPTIONS: [presentation]
#+BEAMER_THEME: Madrid
#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_act(Act) %4BEAMER_col(Col) %8BEAMER_opt(Opt)
#+PROPERTY: BEAMER_col_ALL 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.0 :ETC

#+TITLE: A very long title that will overflow the box that beamer allocates for it on each slide
#+LATEX_HEADER: \subtitle{A shorter title}

* Slide 1

*** Item 1

*** Item 2

* Slide 2

*** Item 3

*** Item 4
--8<---------------cut here---------------end--------------->8---

Nick