Error when working from directory with spaces

[zjuul]

When calling ari_narrate() from a directory that contains whitespace, the ffmpeg command fails with the error:
/Users/jules/tmp/with: No such file or directory

Working directory is:
> getwd()
[1] "/Users/jules/tmp/with space"

tmpfile ari_input_Xrz...txt reads

file '/Users/jules/tmp/with space/ari_img_1_a6KgA7H82gfs.jpeg' duration 14 file '/Users/jules/tmp/with space/ari_img_2_a6KgA7H82gfs.jpeg' duration 6 file '/Users/jules/tmp/with space/ari_img_2_a6KgA7H82gfs.jpeg'