Currently, the h264parse element limits the max allowed PPS id to 31.  h264parse should be updated to accept a max PPS id of 255.  According to section 7.4.2.2 in the H264 spec, the PPS id may range from
0-255.  

Here's the info from 7.4.2.2 in the H264 spec:

  pic_parameter_set_id identifies the picture parameter set that is referred
  to in the slice header. The value of pic_parameter_set_id shall be in the
  range of 0 to 255, inclusive.

  seq_parameter_set_id refers to the active sequence parameter set. The value
  of seq_parameter_set_id shall be in the range of 0 to 31, inclusive.

I'm pasting the proposed patch below.  I'll also add it as an attachment.

Index: gsth264parse.h
===================================================================
--- gsth264parse.h      (revision 3171)
+++ gsth264parse.h      (working copy)
@@ -48,7 +48,7 @@
 typedef struct _GstH264Pps GstH264Pps;

 #define MAX_SPS_COUNT  32
-#define MAX_PPS_COUNT   32
+#define MAX_PPS_COUNT   256

 #define CLOCK_BASE 9LL
 #define CLOCK_FREQ (CLOCK_BASE * 10000)