#99 ERROR: no output .xxx file found

[Zurd]

[dvd-slideshow] ERROR: no output .mp4 file found!
[dvd-slideshow] This usually happens when avconv screws up something
[dvd-slideshow] or one image is messed up and the resulting video can't be created

This happens because there is a loop_input parameters of avconv in dvd-slideshow. This option is deprecated and it should be -loop 1 instead.

If dvd-slideshow is run with -V 2 for more verbose information, there will be this error at the top:
Unrecognized option 'loop_input'.

An easy fix is to
sudo nano /usr/bin/dvd-slideshow
CTRL-4 (to find & replace)
find: loop_input
replace: loop 1