Tags don't get interpolated: "{author.name}", "{title}".

[OnkelTem]

I run ytdl as:

$ ytdl <URL> -o "{author.name} - {title}"

and resulting file gets a name of '{author.name} - {title}.mp4' so no interpolation takes place.

I thought that maybe props are empty, but here is what info command (-i ) shows:

$ <URL> -q 247 -i
title: My Trip From ...
author: Coac...
avg rating: undefined
...

Maybe {author.name} was wrong and I should have used {author} instead, but title was not substituted as well.

$ ytdl --version
1.4.1

[TimeForANinja]

dup of #183