-Working with videos that have large image geometry can greatly impede editing. Instead you can substitute \textit{proxies} which will create smaller video image files from the original file that can then be edited more quickly. When you are done working on this smaller scale, you will need to bring up the Proxy settings menu again, and change the Scale factor back to the Original size so that all of your edits/work take affect on that original higher quality video on the timeline. You can not nest clips while in a proxied state; you will get the error \textit{Nesting not allowed when proxy scale $\ne$ 1}.
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-To use this feature, select \texttt{Settings $\rightarrow$ Proxy settings} and change the Scale factor from Original size to your downsized choice. You can choose ffmpeg as the File Format and a choice of various codecs associated with that. A good choice is the default of \texttt{mpeg} which can usually be quite fast. In addition, to modify values for that codec, click on the wrench icon. When you have completed your choices, just click \texttt{OK}, and then the video tracks will be rendered. This may take some time, but previous proxy renders will be reused. The proxy videos will be added to your assets in a separate Proxy folder, and the video track edits will use the proxies. Proxy downsizing renders all loaded tracks, but only work on the $1^{st}$ video layer of any multi-layer media. Rendered proxy media is saved in the same directory as the original media. As usual, you can delete proxy files from the project or disk in the Resources window if you no longer want to retain them.
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-There are two ways that the proxy files can be used, with or without input scaling. When the proxy is done without rescaling, the Mask, Camera and Projector automations are re-scaled accordingly. In this situation, the entire project will be re-sized so that the session is in the resized geometry. Not all plugins are useful when the project is rescaled, because the keyframe data must be in the original geometry. In this case, you can use the rescaler, by enabling \texttt{Use scaler (FFMPEG only)}. This has the added advantage that the project size does not change and the proxy media is down-scaled as usual and up-scaled on read-in, which means the project editing is done in full scale. Since decoding is done on smaller video, there is a time savings, but all rendering is done full scale. The main reason for using \textit{scaler} is that it does not change the image coordinate data, so that automation and plugin parameters will be in the original project geometry. This is not as fast as the first option, but is a performance gain, and may be needed if you are using plugins that need coordinate data such as the Title plugin. As noted, the scaler only works on ffmpeg video formats.
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-In the upper right hand corner of the main window, there is a toggle button to easily switch back and forth when you have a proxied file on the timeline. The icon is to the left of the FF icon. It will have the letter “P” as the icon for Proxy or if \textit{Using Scaler}, the letter “S”. \quad \includegraphics[height=\baselineskip]{images/proxy-01.png} \quad This quick switch is especially useful when editing and you need to see a better image temporarily.
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-Screencast in figure~\ref{fig:proxy-02} shows the Use scaler checked so you can still use plugins and the original project size is kept. The Scale factor pull-down gives you available size options. Note the new media dimensions shown (partially covered). If the size is an odd number, 1 is added to make the dimensions both even numbers.
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-In the case of the scaler checkbox, it will retain that setting for ease of use.
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-\begin{figure}[htpb]
- \centering
- \includegraphics[width=0.8\linewidth]{images/proxy-02.png}
- \caption{Proxy settings dialog}
- \label{fig:proxy-02}
-\end{figure}
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-There is also a convenient \texttt{Beep on done} checkbox included so that you can work on other tasks until there is an audible notify of completion.
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-A good choice for proxy settings with 1080p source video is: