saveVideo {animation} | R Documentation |
This function opens a graphics device to record the images produced in the
code expr
, then uses FFmpeg to convert these images to a video.
saveVideo(expr, video.name = "animation.mp4", img.name = "Rplot", ffmpeg = "ffmpeg", other.opts = if (grepl("[.]mp4$", video.name)) "-pix_fmt yuv420p", ...)
expr |
the R code to draw (several) plots |
img.name |
the file name of the sequence of images to be generated |
video.name |
the file name of the output video (e.g. ‘animation.mp4’ or ‘animation.avi’) |
ffmpeg |
the command to call FFmpeg (e.g.
|
other.opts |
other options to be passed to |
... |
other arguments to be passed to |
This function uses system
to call FFmpeg to convert the images
to a single video. The command line used in this function is: ffmpeg
-y -r <1/interval> -i <img.name>%d.<ani.type> other.opts video.name
where interval
comes from ani.options('interval')
, and
ani.type
is from ani.options('ani.type')
. For more details on
the numerous options of FFmpeg, please see the reference.
An integer indicating failure (-1) or success (0) of the converting
(refer to system
).
There are a lot of possibilities in optimizing the video. My knowledge on FFmpeg is very limited, hence the default output by this function could be of low quality or too large. The file ‘presets.xml’ of WinFF might be a good guide: http://code.google.com/p/winff/.
Yihui Xie, based on an inital version by Thomas Julou thomas.julou@gmail.com
http://ffmpeg.org/documentation.html
Other utilities: gm.convert
,
im.convert
; saveGIF
,
saveMovie
; saveHTML
;
saveLatex
; saveSWF
oopts = ani.options(ffmpeg = "D:/Installer/ffmpeg/bin/ffmpeg.exe") ## usually Linux users do not need to worry about the path as long as FFmpeg has ## been installed if (.Platform$OS.type != "windows") ani.options(ffmpeg = "ffmpeg") saveVideo({ par(mar = c(3, 3, 1, 0.5), mgp = c(2, 0.5, 0), tcl = -0.3, cex.axis = 0.8, cex.lab = 0.8, cex.main = 1) ani.options(interval = 0.05, nmax = 300) brownian.motion(pch = 21, cex = 5, col = "red", bg = "yellow") }, video.name = "BM.mp4", other.opts = "-b 300k") # higher bitrate, better quality ani.options(oopts)