Proxies was introduced to allow for a smoother timeline experience. Full HD and everything from 4K size up are usually very large in file size. In addition, some commonly used codecs (e.g. h264/5) are very compressed and interframe type, so they are more stressful for timeline playback. These files cause performance problems on weaker PCs. As a solution the developers have introduced proxies to reduce the file size. Reduced means to minimize the resolution/dimension, as usually not the full resolution is needed, because the compositor usually takes only a fraction of the computer screen. Therefore the scaling factor, which indicates how much the original resolution should be reduced.
There is also the \textit{proxy 1:1} \index{proxy!1:1} that maintains the original resolution but still allows you to act on the codec (lowering the bit rate, for example). See also next section: \ref{sec:transcode}.
-When rendering, the original setting will be used to avoid loss of image quality.
+When we want to render the project, remember to remove the proxy to return to the original settings with the highest quality.
To use the proxy in a classic way, i.e. 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 File Format \index{file format} and a choice of various codecs associated with that. A good choice is the default of mpeg which can usually be quite fast. In addition, to modify values for that codec, click on the wrench icon.
More specific information on which plugins need to use \textit{Proxy 1:1}. is provided here next. If the keyframe data uses coordinate data that is absolute, then the Factor scale = 1 should be used. If the data is normalized (like always $0-100\%$) then the proxy can be done with downsize (i.e. classic \textit{Proxy}). The session geometry format, shown in \texttt{Settings $\rightarrow$ Format} as $width \times height$, is changed if scale factor $\neq$ 1 is used to cause all of the data to be in the reduced format. If this affects the plugin operation, then \textit{Proxy 1:1} should be used. Examples of plugins that need the \textit{Proxy 1:1} are: Title, AutoScale, Scale, ScaleRatio, and Translate. Most others are safe to use with downsize.
+\subsection{Proxies with Alpha channel}%
+\label{sub:proxies_alpha_channel}
+
+Next are some examples of tested and working configurations that maintain the alpha channel:
+
+\begin{lstlisting}[numbers=none]
+Proxy #1
+ Scale factor: 1/4
+ Rescaled to project size (FFMPEG only) = unchecked
+ File Format: FFMPEG | qt
+ Video Preset-->
+ Compression: png.qt
+ Bitrate: 0
+ Quality: -1
+ Pixels: rgba (or rgba64be)
+
+
+Proxy #2
+ Scale factor: 1/4
+ Rescaled to project size (FFMPEG only) = unchecked
+ File Format: FFMPEG | qt
+ Video Preset-->
+ Compression: magicyuv.qt
+ Bitrate: 0
+ Quality: -1
+ Pixels: yuva444p
+
+
+Proxy #3
+ Scale factor: 1/4
+ Rescaled to project size (FFMPEG only) = unchecked
+ File Format: FFMPEG | qt
+ Video Preset-->
+ Compression: openjpeg.qt
+ Bitrate: 0
+ Quality: -1
+ Pixels: yuva420p
+
+
+Proxy #4
+ Scale factor: 1/4
+ Rescaled to project size (FFMPEG only) = unchecked
+ File Format: FFMPEG | pro
+ Video Preset-->
+ Compression: prores_4444.pro
+ prores_4444xq.pro
+ Bitrate: 0
+ Quality: -1
+ Pixels: yuva444p10le
+
+
+Proxy #5
+ Scale factor: 1/4
+ Rescaled to project size (FFMPEG only) = unchecked
+ File Format: FFMPEG | mkv
+ Video Preset-->
+ Compression: user_ffvhuff.mkv
+ Bitrate: 0
+ Quality: -1
+ Pixels: yuva4--p
+ yuva4--p--le
+\end{lstlisting}
+
\section{Transcode}%
\label{sec:transcode}
\index{transcode}
It is sometimes handy to have EDL \index{EDL} assets not as a copy, but as a
reference that is automatically updated into your project. Suppose
you have several short videos that at the end have the same credits
-which include the current year such as 2019. But now it is 2020 and
+which include the current year such as 2021. But now it is 2022 and
all of the videos would have to be individually updated with the new
date. By including a \textit{Referenced File} as the EDL file type
when you create each of the videos, you can just change the one
projects / goodguy / cin-manual-latex.git / blobdiff