Java SE (Java Platform, Standard Edition)

I want to play two videos with only one MediaPlayer:

private static MediaPlayerBuilder mpB;
private static Media mLogo;
private static Media mSaludo;
private static MediaPlayer mpLogo;
private static MediaView mvLogo;
private static Group gLogo;

public void start(final Stage stage) {
...
mLogo = MediaBuilder.create().source(myGetResource(VIDEOLOGO_PATH)).build();
mSaludo = MediaBuilder.create().source(myGetResource(VIDEOSALUDO_PATH)).build();
mpB = MediaPlayerBuilder.create(); 
mpLogo = mpB.media(mLogo).build();
mvLogo = MediaViewBuilder.create().mediaPlayer(mpLogo).build();
gLogo.getChildren().add(mvLogo);
...
sActual = new Scene(gPozos, WIDTH, HEIGHT, Color.BLACK);
stage.setScene(sActual);
stage.show();

When I want to play mLogo:

sActual.setRoot(gLogo);
mpLogo.play();

Then, when I want to play mSaludo I do this:

mpLogo = mpB.media(mSaludo).build();
sActual.setRoot(gLogo);
mpLogo.play();

or this:

mpB.media(mSaludo).applyTo(mpLogo); 
sActual.setRoot(gLogo);
mpLogo.play();

or this:

mpB.media(mSaludo);
sActual.setRoot(gLogo);
mpLogo.play();

But is impossible to change the Media. It doesn't work. Sometimes I play mLogo video and sometimes (depends on the code) the video mLogo doesn't start and I see an image of the first keyframe and nothing else. I have no exceptions, no errors, nothing.
I want to play mLogo and then mSaludo. How can I do this?

Thanks
Noelia