There is also the \textit{proxy 1:1} \index{proxy!1:1} option that maintains the original resolution but still allows you to modify codec parameters (lowering the bit rate, for example). This is explained in the next section, \ref{sec:transcode}.
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.
+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
+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.
The usual steps to use Proxy are:
\begin{enumerate}
\item Check that \textit{File Format} is set to \texttt{FFMPEG}.
- \item Check or uncheck the \texttt{Rescaled to project size} (FFMPEG only). The difference with this option will be explained here \nameref{sub:rescaled_project_size_works}. But for old computers checking Rescaled to project size is not recommended. You need to know that when Rescaled to project size is unchecked some Effects/Plugins do not work as expected because they use pixel values instead of percentage values as is used in the Project Format. For example \texttt{Title}, \texttt{Blur}, \texttt{Sketcher} plugins do not work right if unchecked, while \texttt{Perspective} and \texttt{Crop\&Position} plugins work correctly for both checked and unchecked.
+ \item Check or uncheck the \texttt{Rescaled to project size} (FFMPEG only). The difference with this option will be explained here \ref{sub:rescaled_project_size_works}. But for old computers checking Rescaled to project size is not recommended; again due to requiring more CPU. You need to know that when Rescaled to project size is unchecked some Effects/Plugins do not work as expected because they use pixel values instead of percentage values as is used in the Project Format. For example \texttt{Title}, \texttt{Blur}, \texttt{Sketcher} plugins do not work right if unchecked, while \texttt{Perspective} and \texttt{Crop\&Position} plugins work correctly for both checked and unchecked.
\item Choose the \textit{Scale factor}. The options may be different if Rescaled to project size is checked or unchecked. The smaller the Scale factor is, the smoother playing on the Timeline will be ($\frac{1}{8}$ is smaller than $\frac{1}{4}$), but on the Viewer/Compositor the image will be degraded/pixelated more.
\item Set the \textit{File Type} in the \textit{File Format} for FFMPEG, such as mp4, mpeg, or mov. Still images like jpg, tiff, and png will be converted to PNG files with alpha channel if it had an alpha channel.
\item Click on the wrench icon to configure video compression; just use the default values if you are unsure and prefer not to experiment.
\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.
+ \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.
+
\end{itemize}
Note: the dimensions of the frame/image are downscaled to the Scale factor; so if the Scale factor is $\frac{1}{4}$ and the dimension of the image is $4288x2848$ pixels, that image will be downscaled to $1072x712$. It doesn't matter what the Project Format is.
If you create proxies for Nested clips they will be saved in \texttt{\$HOME/Videos} unless you modify that in \texttt{Settings $\rightarrow$ Preferences}, \texttt{Interface tab}, \texttt{Nested Proxy Path}. If you change anything in a Nested clip using the Open EDL feature, you must first delete its old proxy file from disk because it is not updated automatically, and then enable Proxy again so that a new one is created.
-Not all the settings for Proxy are saved in the project: the values of Active Scale and the Rescaled to project size are saved but not the \textit{File Format}, \textit{File Type} and all video compression data. A good idea is to record this information in a README file about your project where you make a note of your Proxy settings for that project.
+Not all the settings for Proxy are saved in the project: the values of Active Scale and the Rescaled to project size are saved but not the \textit{File Format}, \textit{File Type} and all video compression data. A good idea is to record this information in a README file about your project where you make a note of your Proxy settings for that project.
+This is especially important because some Projects may use different Proxy settings and
+if you load a project where the Proxy is set and disabled, it could use a different
+setting because you changed the Proxy settings in a project you were working on before.
+If in that Project its proxy files were not deleted and you want to reuse them to save
+time, unfortunately they will be created again because the proxy settings have changed.
+
If the \textit{Creation of proxy on media loading} option has been checked, then when you load other media later, proxies will be created for them automatically, or else you can change the Proxy's State from disabled to enabled (Active) using the Proxy icon. Previous proxy renders will be reused unless you change one of the following proxy parameters: \textit{Scale factor}, \textit{File Format}, or \textit{File Type}. If proxies have been created and then you decide to change only the Compression type (Codec, Bitrate, Quality, Pixels), without changing the Scale factor or Container, you must delete proxy files from the disk beforehand. That is because \CGG{} does not read the compression type; it does read the filename and if the filename does
not change, \CGG{} thinks the proxy was already created.
projects / goodguy / cin-manual-latex.git / commitdiff