dynamic - How to make a movie from a complex demonstration?

I have a complex Manipulate-based demonstration containing a few sliders and a Setterbar.

I would like to make a movie out of it, avi, or whatever else. The movie will then be used for a journal publication as a Supporting material, so the quality should be good enough.

When the movie plays, the Setterbar should set its first value, then the sliders should move one after another, and then together. Further, the setter bar should set its second value and the slider manipulations should be repeated with this new Setterbar value. And so it should go for all Setterbar values. There will be something like 3-4 of them.

Is it possible at all?

To be more precise, I prepared a simplified demonstration with such controls:

    Manipulate[Plot[{Sin[a*x] + b*Cos[3 a*x], k*x}, {x, 0, \[Pi]}],
 {a, 1, 2}, {b, 0, 1}, {k, {0, 0.5, 1}}]

Answer

You can define a function that creates Manipulates with a "fake" SetterBar and a specific AutorunSequencing

m[k_, seq_] := Manipulate[
 Plot[{Sin[a*x] + b*Cos[3 a*x], k*x}, {x, 0, Pi}, ImageSize -> 400], 
 {a, 1, 2}, {b, 0, 1}, Grid@{{"k", SetterBar[k, {0, .5, 1}]}}, 
 AutorunSequencing -> seq, ContentSize -> {420, 270}]

then create the frames for the movie with

frames = Join @@ (ArrayPad[
    ImportString[ExportString[#, "AVI"], "ImageList"], {0, 3}, "Fixed"] & /@ 

  Flatten[Table[{m[k, {{1, 1}, {2, 1}}], m[k, {All, 2.85}]}, {k, 0, 1, 0.5}]]);

and export them as using

Export["D:\\animationTest.gif", frames]

or

Export["D:\\animationTest.avi", frames]

Without a specified ContentSize exporting to "AVI" fails, as the size of the frames varies.