Using_ffmpeg.tex

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% Programming/Coding Assignment
% LaTeX Template
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\newcommand{\hmwkTitle}{Using ffmpeg} % Assignment title
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\tableofcontents
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%	PROBLEM 1
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\begin{homeworkProblem}[Procedure 1: Basic Syntax. Overview]
\vspace*{7pt}
\textbf{ffmpeg} reads from an arbitrary number of input files specified by the -i option.\\
Anything that cannot be interpreted as an option is considered to be an output filename.\\ \\
Options are applied to the next specified file, so order matters, and you can have the same option multiple times in one command line\\
Do not mix input and output files\\
\\
\begin{itemize}
	\item \textbf{-f \textit{format (input/out)}}: force input or output file formate. Most of the time auto detected.
	\item \textbf{-i \textit{filename (input)}}: input file name
	\item \textbf{-y / -n \textit{(global)}}: overwrite / don't overwrite(exit immediately if same name) output files
	\item \textbf{-t \textit{duration (i/o)}}: input (before -i): limits duration of data read, output: stop writing after duration reached
\end{itemize}

\end{homeworkProblem}

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%	PROBLEM 2
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% To have just one problem per page, simply put a \clearpage after each problem

\begin{homeworkProblem}[Procedure 2: Making movies. FPS adjustment ]
\vspace*{7pt}
\textbf{\$ ffmpeg -i \textit{input file (HAS to be specified by \%0\#d.png format)} output.mp4}\\
\textbf{\$ ffmpeg -i \%05d.png -f mp4 -vcodec libx264 -pix\_fmt yuv420p test.mp4}\\
\\
\underline{Some useful options}
\begin{itemize}
	\item \$ ffmpeg -i \textit{input video} -vf "setpts=(X)*PTS" \textit{output video}. adjusts speed by 1/X
	\item \$ ffmpeg  ... \textbf{-vb 20M output.mp4}: high quality videos
\end{itemize}


%\perlscript{homework_example}{Sample Perl Script With Highlighting}

\end{homeworkProblem}
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%	PROBLEM 3
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%
%\begin{homeworkProblem}[Procedure 3: Cropping images]
%\vspace*{7pt}
%\textbf{\$ convert ``original image.png'' -crop \textit{geometry}  +repage ``new image.png''}\\
%\textbf{\$ mogrify ``original image.png'' -crop \textit{geometry}  +repage} (otp name = inp name) ?? incorrect syntax\\
%\\
%for usual POVray operations, 600x800 images are generated.\\
%optimal crop geometry: 540x500+130+100\\
%+REPAGE automatically centers the cropped image (trims the whitespace from original crop)\\
%\\
%\underline{geometry options}\\
%\begin{itemize}
%	\item scale\% : H,W both scaled
%	\item scale-x\%xscale-y\% : H,W specifically scaled
%	\item width : W given, H automagically selected to preserve aspect ratio
%	\item xheight : H given, W automagically selected to preserve aspect ratio
%	\item widthxheight : Max values of H and W, as preserved
%	\item widthxheight$\wedge$ : Min values of H,W, as preserved
%	\item widthxheight! : H, W given. original aspect ratio ignored
%	\item widthxheight$>$ : Shrinks image with dimension(s) \textbf{larger} than the arg(s)
%	\item widthxheight$<$ : Enlarges image with dimension(s) \textbf{smaller} than the arg(s)
%	\item area\@ : Resize image to have specified area in pixels. AS preserved
%	\item \{ size \}\{ +/- x\}\{ +/- y\} : Size=any of the above setting, and offset values. Upper Left corner is +0+0, Lower Right is +x+y. Do not include brackets in the command line.\\
%\end{itemize}
%
%\underline{Inline operations (operations on-the-fly, batch processing)}\\
%\\
%\textbf{\$ `$*$png' -crop \textit{geometry} output\%03d.png}
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\end{document}