R setting of par for saveVideo

Question

I have two stacks of images (each of 256 x 256 and 20 of these images in each stack) and I am making a video file using saveVideo for displaying the images from two stacks side by side, ie 512 x 256.

The images appeared to be squeezed in x-axis. I tried a few different combinations, but can't get the ratio right. Any thoughts, please?

par(mar = c(5, 0.2, 1, 2), mgp = c(3, 1, 0), tcl = -0.3, cex.axis = 1, cex.lab = 1, cex.main = 1)

ani.options(interval = 0.1, nmax = 50, ani.height=1, ani.width=4)

Answer 1

通过为ffmpeg添加“ -vf scale = 512：256”已解决了该问题。