Fix files with fps between 0.5 and 0.1.

Fixes issue749


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16123 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffplay.c

@@ -1024,7 +1024,7 @@ static void video_refresh_timer(void *opaque)
 
             /* compute nominal delay */
             delay = vp->pts - is->frame_last_pts;
-            if (delay <= 0 || delay >= 2.0) {
+            if (delay <= 0 || delay >= 10.0) {
                 /* if incorrect delay, use previous one */
                 delay = is->frame_last_delay;
             }