input-slave in playlist does not work

Try opening a video file with a input-slave audio file using the advanced opening dialog. File plays as expected.

Save this in a playlist. Resulting xml in case of xspf-playlist contains this:

Open the resulting playlist and try to play it. Video will show up, however the audio won't play.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information