Output Template ignored when using suggested format selection option

[Zettt]

I liked the idea suggested in ]format selection](https://github.com/rg3/youtube-dl/blob/master/README.md#format-selection). Use -f bestvideo[height<=?1080]+bestaudio/best I modified this to (mp4)[height<=?1080]+bestaudio/best. I'm also using an output template: %(uploader)s %(title)s.%(ext)s.

1. This does work, but it leaves behind many audio files.
2. The output filenames have their format shorthand after them, e.g. Einführung u. Grundlagen I.f141

[jaimeMF]

As explained in the bug reporting instructions: post the full output you get when you run youtube-dl --verbose URL OTHER_OPTIONS.