Rotate - straighten image?

[Jaque]

I'm trying to edit video of church service and one of them is tilted to the left.
On my photo editing program I can select "Rotate" and by how many degrees, and it pops right to the setting.  It also has "Rotate 90°" etc...
If Avidemux has this feature I can't find it, despite trying everything I can think of.
This certainly isn't a very "intuitive" program, is it?
Tried to "append" 3 clips together and ended up getting video ok but audio garbled beyond comprehansion, and no way to repair it that I can find(?)

[eumagga0x2a]

Enable OpenGL in the preferences and apply the "OpenGL Rotate" filter.

This certainly isn't a very "intuitive" program, is it?

Feel free to contribute code to shape Avidemux to your linking.

Tried to "append" 3 clips together and ended up getting video ok but audio garbled beyond comprehansion, and no way to repair it that I can find(?)

You were told to try a recent nightly and in case it exhibits the same problem to provide a sample.

[Jan Gruuthuse]

Youtube sample video applied Filter OpenGl: OpenGl Rotate