'Previous frame' function
There already is the useful function (and keyboard shortcut) 'Next Frame' which moves a paused video by one frame forward.
I'd like to request the implementation of a counterpart of that function: 'Previous Frame'.
For formats like MJPG (where every frame is a key frame) this should be very easy to implement. For other formats this will involve rewinding the video "internally" backwards to the nearest keyframe and from there to fast forward to the correct frame.