Always remember when getting ready to render the project, disable Proxy to return to the original settings with the highest quality.
To use proxy in a classic way, that is as a scaling, select \texttt{Settings $\rightarrow$ Proxy settings} and change the Scale factor from Original size to your downsized choice. You can choose ffmpeg as the \textit{File Format} \index{file format} and for the \textit{File Type} a choice of various codecs associated with that. A good choice for \textit{File Type} is the default of mpeg or mov which can usually be quite fast. In addition you can modify values for that codec by clicking on the wrench icon. Once you have created a
-scaled proxy file, it will be reused and does not have to be created again as long as you
+proxy file, it will be reused and does not have to be created again as long as you
do not change certain parameters. This saves a lot of CPU time.
There are two main ways to use Proxy, with or without \texttt{Rescaled to project size} option checked. The options of the Scale factor may be different if Rescaled to project size is checked versus unchecked. It is a special case when the Scale factor is set to "1" and it does not matter if Rescaled to project size is checked or unchecked.
\item Click on the OK button to close the Compressor window.
\end{enumerate}
\item Now click on the \texttt{OK} button to start the rendering for the proxy.
- \item Look in the lower right corner of the main window where there is a progress bar and a percentage value showing the progress of the creation of proxies, and in the lower left corner there is the \texttt{Creating proxy files... ETA: hh:mm:ss} text with the "estimated time of completion" in hours, minutes, seconds. Depending on how many files your project uses, the file size, which codec is used, the scale factor, and cpu performance, creating proxies may take some time.
+ \item Look in the lower right corner of the main window where there is a progress bar and a percentage value showing the progress of the creation of proxies, and in the lower left corner there is the \texttt{Creating proxy files... ETA: hh:mm:ss} text with the "Estimated Time of Arrival (completion)" in hours, minutes, seconds. Depending on how many files your project uses, the file size, which codec is used, the scale factor, and cpu performance, creating proxies may take some time.
\end{enumerate}
You will know that Proxy mode is enabled because:
\begin{itemize}
\item When \texttt{Rescaled to project size (FFMPEG only)} is checked, the size of the video data to be computed will always be the same as the Project Format. The size of your video is scaled down to the Scale factor BUT then it is rescaled up to the Project Format. For example, your Project Format is 1920x1080 and Proxy's Scale factor is $\frac{1}{4}$, then your videos ($1920x1080$) will be scaled down to 480x270 and then up-scaled to $1920x1080$. All the Effects/Plugins work correctly because the original resolution/geometry/size is not changed. For an old computer, this option is not recommended.
- \item When \texttt{Rescaled to project size (FFMPEG only)} is UNchecked, the size of the video data to be computed will be reduced to the Scale factor. The size of your video is scaled down to the Scale factor. For example, your Project Format is 1920x1080 and Proxy's Scale factor is $\frac{1}{4}$, then your videos ($1920x1080$) will be scaled down to $480x270$. It works as if the Project Format were $480x270$ (and really it works). If you take a look at \texttt{Settings $\rightarrow$ Format...} when Proxy is enabled (Active), you can see that the Width and Height are changed according to the Scale factor; you absolutely must NOT change these values! The good thing is that your computer will be faster. The bad thing is that some Effects/Plugins do not work as expected because they use pixel units. Examples are \texttt{Title} and \texttt{Blur} plugins. A workaround is needed for that - you can see an example in the tutorial \url{https://www.youtube.com/watch?v=YCqJnHLmj6s} at 1m:56s where the Snapshot feature is used to "convert" the white line to a PNG. Or another workaround is to use Inkscape to create a title and export it to PNG that you load instead of using the \textit{Title} plugin.
+ \item When \texttt{Rescaled to project size (FFMPEG only)} is UNchecked, the size of the video data to be computed will be reduced to the Scale factor. The size of your video is scaled down to the Scale factor. For example, your Project Format is 1920x1080 and Proxy's Scale factor is $\frac{1}{4}$, then your videos ($1920x1080$) will be scaled down to $480x270$. It works as if the Project Format were $480x270$ (and really it works). If you take a look at \texttt{Settings $\rightarrow$ Format...} when Proxy is enabled (Active), you can see that the Width and Height are changed according to the Scale factor; you absolutely must NOT change these values! The good thing is that your computer will be faster. The bad thing is that some Effects/Plugins do not work as expected because they use pixel units. Examples are \texttt{Title} and \texttt{Blur} plugins. A workaround is needed for that, such as using Inkscape to create a title and export it to PNG that you load instead of using the \textit{Title} plugin.
\end{itemize}
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