[Tex/LaTex] splitting beamer frame vertical into two frames (with frametitle)

Question

I would like to split one frame into two frames located next to each other. Basicaly I could do this using minipage or columns (as the example shows)…However in this case I will lose some space from skipping the frametitle.

This is how it might work (not what I am looking for)

\begin{document}
\begin{frame}{~}
\begin{columns}
    \begin{column}{.5\textwidth}
        {\usebeamerfont{frametitle}\usebeamercolor[fg]{frametitle} left frame title}
    \end{column}
    \begin{column}{.5\textwidth}
        {\usebeamerfont{frametitle}\usebeamercolor[fg]{frametitle} right frame title}
    \end{column}
\end{columns}
\end{document}

But I actually want somehting like:

\begin{frame}
    \frametitleleft{left frame title}
    \frametitleright{right frame title}

    \leftcontent{..}
    \rightcontent{...}
\end{frame}

I am hoping you understand what exactly I am trying to achieve.

EDIT: This kind of addresses what I am looking for, but not exactly.

Answer 1

You could temporarily switch to a custom frametitle template, that supports two titles:

\documentclass{beamer}

\defbeamertemplate{frametitle}{splitframe}[3][]{%
  \ifbeamercolorempty[bg]{frametitle}{}{\nointerlineskip}%
  \vbox{}\vskip-1ex%
  \begin{minipage}{.48\textwidth}%
      \usebeamercolor{frametitle}%
    \usebeamerfont{frametitle}%
    \strut #2%
  \end{minipage}%
  \hfill%
  \begin{minipage}{.48\textwidth}%
      \usebeamercolor{frametitle}%
    \usebeamerfont{frametitle}%
    \strut #3%
  \end{minipage}%
  \vskip-1ex%  
}

\begin{document}

\begingroup
\setbeamertemplate{frametitle}[splitframe]{left frametitle}{right frametitle}
\begin{frame}
\frametitle{foo} % <- needs to be non-empty, content does not matter
\begin{columns}[onlytextwidth,T]
    \begin{column}{.48\textwidth}
        left frame text
    \end{column}
    \begin{column}{.48\textwidth}
        right frame text
    \end{column}
\end{columns}
\end{frame}
\endgroup
\end{document}