To encode a series of $48$\,bit tiff output image files, add a file to the \CGG{} data ffmpeg/video subdirectory as in:
\begin{lstlisting}[style=sh]
-# \dots/ffmpeg/video/tiff.dfl
+# {path_to_cinelerra}/bin/ffmpeg/video/tiff.dfl
tiff48.tif
\end{lstlisting}
Then create an ffmpeg video encoder parameters file in the same directory:
\begin{lstlisting}[style=sh]
-# \dots/ffmpeg/video/tiff48.tiff
+# {path_to_cinelerra}/bin/ffmpeg/video/tiff48.tiff
image2 tiff
pixel_format=rgb48
\end{lstlisting}