Better advanced example data

[daniel-keitel]

The advanced example currently uses example data, which is not publicly available.
It helps to show the capabilities of playplot, but the data is presented, mostly in a nonsensical way.

I don't know any good resources for these files.
It would be nice if you could give some proposals.
All files should be free and easily downloadable (direct url).
And be probably still available in years.

Inter document navigation

A proper example would be great.
Two short audio files of different versions of the same piece, and mapping data between them.

Video

Should it even be an example?
A mp4 and corresponding audio file would be required. (Monochrom video would be best)

Long file streaming

A very long audio file is required (>1h longer is better).