ffplay: increase MIN_FRAMES to 25

FFplay was using a 5 frame packet buffer, this is not much (e.g. 200 ms for
25fps video), when HLS is requesting a new segment via HTTP, it may take longer
for the request to complete.

Should fix ticket #4720.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Marton Balint <cus@passwd.hu>

ffplay.c

@@ -66,7 +66,7 @@ const char program_name[] = "ffplay";
 const int program_birth_year = 2003;
 
 #define MAX_QUEUE_SIZE (15 * 1024 * 1024)
-#define MIN_FRAMES 5
+#define MIN_FRAMES 25
 #define EXTERNAL_CLOCK_MIN_FRAMES 2
 #define EXTERNAL_CLOCK_MAX_FRAMES 10