Revert "examples/video: reduce video FPS"

This reverts commit 6f3f58cb32.

Reason: decoding the video already follows the framerate of the MPEG
data and skips rendering when necessary, so there is no need to adjust
FPS from Update.

examples/video/main.go

@@ -31,17 +31,9 @@ var shibuya_mpg []byte
 
 type Game struct {
 	player *mpegPlayer
-
-	counter int
 }
 
 func (g *Game) Update() error {
-	// Update the video player once per two ticks.
-	// This indicates to play the video in 30 FPS.
-	if g.counter % 2 == 0 {
-		g.player.Update()
-	}
-	g.counter++
 	return nil
 }
 

examples/video/mpegplayer.go

@@ -85,7 +85,8 @@ func newMPEGPlayer(src io.Reader) (*mpegPlayer, error) {
 	return p, nil
 }
 
-func (p *mpegPlayer) Update() {
+// updateFrame upadtes the current video frame.
+func (p *mpegPlayer) updateFrame() {
 	p.m.Lock()
 	defer p.m.Unlock()
 
@@ -118,6 +119,7 @@ func (p *mpegPlayer) Update() {
 
 // Draw draws the current frame onto the given screen.
 func (p *mpegPlayer) Draw(screen *ebiten.Image) {
+	p.updateFrame()
 	frame := p.currentFrame
 	sw, sh := screen.Bounds().Dx(), screen.Bounds().Dy()
 	fw, fh := frame.Bounds().Dx(), frame.Bounds().Dy()