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If I use the caption package with beamer frames, I get a 'missing number treated as zero'.

The following compiles with texlive, but if I uncomment the \usepackage{caption} line, I get the error.

\documentclass[10pt]{beamer}

\usetheme{metropolis}
\usepackage{appendixnumberbeamer}

% \usepackage{caption}

\title{Error}
\author{Author}
\institute{Stack Overflow}

\begin{document}

\maketitle

\begin{frame} \frametitle{Introduction}
\begin{columns}
    \begin{column}{0.5\textwidth}
        \begin{figure}
            \includegraphics[width=.9\linewidth]{example-image-duck}
            \caption{Duck\footnote[frame]{Duck Duck}}
        \end{figure}
    \end{column}
    \begin{column}{0.5\textwidth}
        \begin{figure}
            \includegraphics[width=.9\linewidth]{example-image-duck}
            \caption{Duck\footnote[frame]{Duck Duck}}
        \end{figure}
    \end{column}
\end{columns}
\end{frame}

\end{document}
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8
  • 1
    Hello and welcome. The error is from the [frame] option added to the macro \footnote[frame]{}. Removing this option will make it work : \caption{Duck\footnote{Duck Duck}}. Where did you get this [frame] option?
    – AndréC
    Commented Jul 19, 2020 at 5:52
  • I think in general beamer is incompatible with caption. beamer already provides caption-related templates to control style of \caption, see beamer manual, sec. 12.6. Hence you can avoid loading caption by make use of those beamer caption templates.
    – muzimuzhi Z
    Commented Jul 19, 2020 at 5:55
  • 2
    @AndréC \footnote[frame] is supported by beamer to indicate "this footnote should be typeset at the bottom of the frame", see beamer manual, sec. 12.12. Furthermore, although no errors, using \caption{Duck \footnote{Duck Duck}} produces wrong output, in which the width of column is wider than expected. From beamer issue #268, Incompatibility of beamer with caption package, it seems the compatibility issue is never solved.
    – muzimuzhi Z
    Commented Jul 19, 2020 at 6:00
  • 1
    On the caption side, it do fixed compatibility reported issues with beamer, see here. So if one can reduce the problem to be caption-related, an issue to gitlab.com/axelsommerfeldt/caption/-/issues is welcome. @AndréC I checked again, the too-wide column issue is reproducible even without caption. Sorry for my mis-judgement.
    – muzimuzhi Z
    Commented Jul 19, 2020 at 6:17
  • 1
    This is an compatibility issue, and I've reported to caption. See gitlab.com/axelsommerfeldt/caption/-/issues/84.
    – muzimuzhi Z
    Commented Jul 19, 2020 at 7:09

1 Answer 1

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1

Some updates:

Thanks to Axel Sommerfeldt, the author of caption, this compatibility issue has been fixed in caption 2020-07-20, and the update is already installable in TeX Live. MiKTeX users might need to wait.

This update even allows the direct use of \footnote in multi-line \caption, which will produces two copies of footnote text at the bottom of frame in plain beamer.

\documentclass[10pt]{beamer}

\usetheme{metropolis}
\usepackage{appendixnumberbeamer}

\usepackage{caption}

\begin{document}

\begin{frame} \frametitle{Introduction}
\begin{columns}[t]
    \begin{column}{0.5\textwidth}
        \begin{figure}
            \includegraphics[width=.9\linewidth]{example-image}
            \caption{Duck\footnote[frame]{Duck Duck}}
        \end{figure}
    \end{column}
    \begin{column}{0.5\textwidth}
        \begin{figure}
            \includegraphics[width=.9\linewidth]{example-image}
            \caption{Duck Duck Duck Duck Duck Duck\footnote[frame]{Duck Duck}}
        \end{figure}
    \end{column}
\end{columns}
\end{frame}

\end{document}

enter image description here

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