handle decoding multiple frames in one Update() when not threaded

stepmania/src/arch/MovieTexture/MovieTexture_FFMpeg.cpp

@@ -892,6 +892,12 @@ void MovieTexture_FFMpeg::DecoderThread()
 }
 
 void MovieTexture_FFMpeg::Update(float fDeltaTime)
+{
+	/* We might need to decode more than one frame per update.  However, there
+	 * have been bugs in ffmpeg that cause it to not handle EOF properly, which
+	 * could make this never return, so let's play it safe. */
+	int iMax = 4;
+	while( --iMax )
 	{
 		if( !m_bThreaded )
 		{
@@ -925,6 +931,9 @@ void MovieTexture_FFMpeg::Update(float fDeltaTime)
 			m_BufferFinished.Post();
 	}
 
+	LOG->MapLog( "ffmpeg_looping", "MovieTexture_FFMpeg::Update looping" );
+}
+
 /* Call from the main thread when m_ImageWaiting == FRAME_WAITING to update the
  * texture.  Sets FRAME_NONE.  Does not signal m_BufferFinished. */
 void MovieTexture_FFMpeg::UpdateFrame()