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\documentclass{article}
\usepackage[explicit]{titlesec}
\usepackage{lipsum,framed,color,xcolor}
\definecolor{shadecolor}{rgb}{1,0.8,0.3}
\titleformat{name=\subsection,numberless}{\ttfamily}{}{0em}{\colorbox{shadecolor}{\parbox{\dimexpr\textwidth-2\fboxsep\relax}{{#1}}}}\title{Video paths}
\author{}
\date{}
\begin{document}
\maketitle
\emph{Encoder} calls \texttt{Player::pass()} repeatedly.
\subsection*{Player::pass()}
Look through all `pieces' (content, decoder, video/audio position) and
find earliest last emission. Call \texttt{pass()} on earliest
decoder.
\subsection*{FFmpegDecoder::pass()}
Decoder may or may not generate a frame. Adjust for gaps in PTS.
(FFmpegDecoder does FFmpeg filtering here).
\subsection*{VideoDecoder::video(image, same, frame)}
The \emph{frame} parameter is the frame within the source. This
handles 3D and emits \texttt{Video}, which is caught by
\texttt{Player::process\_video}.
\subsection*{Player::process\_video(piece, image, eyes, same, frame)}
\begin{itemize}
\item Trim
\item Crop
\item Scale
\item Superposition of burnt-in subtitles.
\end{itemize}
Emits \texttt{Video} which is caught by \texttt{Encoder::process\_video}.
\end{document}
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