If the toolkit Pdftk is available in the system, it will be called to manipulate the PDF files (especially to compress the PDF files).
This is a wrapper to call pdftk. The path of pdftk should
be set via ani.options(pdftk = 'path/to/pdftk').
See the reference for detailed usage of pdftk.
library(animation)
pdf("huge-plot.pdf")
plot(rnorm(50000))
dev.off()
## Windows
ani.options(pdftk = "D:/Installer/pdftk.exe")
pdftk("huge-plot.pdf", output = "huge-plot0.pdf")
## Linux (does not work??)
ani.options(pdftk = "pdftk")
pdftk("huge-plot.pdf", output = "huge-plot1.pdf")
ani.options(pdftk = NULL)
file.info(c("huge-plot.pdf", "huge-plot0.pdf", "huge-plot1.pdf"))["size"]