Stop videoplayback in flash on frame exit?

Question

Is there a way to stop video playback from a video when I leave the frame?
On the first frame a video plays, but I when click the button to goto the second frame, it stills plays sound. I can't add a stop action like flv_mc.stop because on the next frame there is no video so the flv_mc does not exist. I tried putting it on the frame but outside the stage but it disrupts the tweens I have on the stage. I even tried putting the video player inside a movie clip with two frame, one with the vido player and a blank one, to see if I could rig it to exist on both main frames but on the one it would be stopped and set to a blank frame but the video player doenst work when nested 2 movieclips deep. The video player is not on the main timeline but inside of a content_mc and it works put putting it inside of its own movieclip broke it.
I have also tried REMOVED_FROM_STAGE and that works but give me output errors. I have buttons (with gotoandStop actions) and only two of them have videos. At first I used removed from stage and copy and pasted on the frames the buttons navigate two, but it gave me and error of duplicate function, so I have three functions for REMOVED_FROM_STAGE. And they seemingly work and then I get output errors saying:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
          at Woomer_DisneyCruiseUPDATE_fla::content_mc_12/frame2()
          at flash.display::MovieClip/gotoAndStop()
          at Woomer_DisneyCruiseUPDATE_fla::MainTimeline/goOne()
The file name is Woomer_DisneyCruiseUPDATE_fla.
BTW the buttons are on the main timeline and they control navigation on the inside of a movieclip called content_mc

Answer 1

That gave me errors because is said it was duplicate function even though it was on different frames, and also o nthe frame without the video it didn't know what to stop.
I found away around it though. I set variables for each button command and then on added and extra frame inside the content that function as a navigation. On this frame it stops the video and the checks boolean variables on the main timeline set by the buttons. It basically checks to see which button was pushed and then finishes the button command by going to that frame. Basically it takes a detour rather than going directly to the disired frame, on that detour frame it stops and videos that are playing and uses if/then statments to check for boolean that alternate based on the button that was pressed in the main timeline.
this is an example:
Main time line-->
var my_btnOne:boolean=true;
var my_btnTwo:boolean=false;
my_btn.addEventListener(MouseEvent.CLICK, buttonGo);
function buttonGo(e:MouseEvent):void{
     my_btnOne=true;
     my_btnTwo=false;
     content_mc.gotoAndStop(nav);
my_btnTwo.addEventListener(MouseEvent.CLICK, buttonGoTwo);
function buttonGoTwo(e:MouseEvent):void{
     my_btnOne=true;
     my_btnTwo=false;
     content_mc.gotoAndStop(nav);
inside content_mc:-->
if(my_btnOne){
gotoAndPlay("two");