Increase VIDEO_PICTURE_QUEUE_SIZE to 2.

this allows more asynchronous decoding and display thus improving
video smoothness.
It also seems to improve absolute video decoding speed for some reason


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22434 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffplay.c

@@ -87,7 +87,7 @@ typedef struct PacketQueue {
     SDL_cond *cond;
 } PacketQueue;
 
-#define VIDEO_PICTURE_QUEUE_SIZE 1
+#define VIDEO_PICTURE_QUEUE_SIZE 2
 #define SUBPICTURE_QUEUE_SIZE 4
 
 typedef struct VideoPicture {