This is a patch to gop_fixup to avoid an assertion that occurs when
the input MPEG 2 has a sequence header with a bad frame rate value.
I've found this to be useful when trying to master DVDs with dvdauthor
from files encoded by a Hauppauge WinTV PVR 250/350 card using the
IVTV driver (for instance, with MythTV), after removing commercials
with gopchop.

Eric Smith <eric@brouhaha.com>
9-Jan-2005

http://mlug.missouri.edu/~markrages/software/gop_fixup/
http://outflux.net/unix/software/GOPchop/
http://ivtv.sourceforge.net/
http://205.209.168.201/~ckennedy/ivtv/
http://www.mythtv.org/
http://dvdauthor.sourceforge.net/

--- gop_fixup.c~	2004-05-12 14:30:57.000000000 -0700
+++ gop_fixup.c	2005-01-09 14:00:27.327293554 -0800
@@ -148,18 +148,21 @@
 		break;
 	      case SEQUENCE_HEADER_CODE:
 		fr_index=mem[fpos+4+3]&0xf;
-		assert(fr_index<10);
-		new_framerate=frameratetab[fr_index];
-		if (framerate) {
-		  if (framerate!=new_framerate) {
-		    printf("Segments in stream have mismatched framerates.\n");
-		    printf("%d != %d\n",framerate,new_framerate);
-		    printf("Whatever, continuing...\n");
-		    //exit(1);
-		  }
+		if (fr_index >= 10) {
+		  printf ("bad framerate index %d, ignoring.\n", fr_index);
 		} else {
-		  framerate=new_framerate;
-		  printf("Found sequence with nominal framerate %d\n",framerate);
+		  new_framerate=frameratetab[fr_index];
+		  if (framerate) {
+		    if (framerate!=new_framerate) {
+		      printf("Segments in stream have mismatched framerates.\n");
+		      printf("%d != %d\n",framerate,new_framerate);
+		      printf("Whatever, continuing...\n");
+		      //exit(1);
+		    }
+		  } else {
+		    framerate=new_framerate;
+		    printf("Found sequence with nominal framerate %d\n",framerate);
+		  }
 		}
 		break;
 	      case GROUP_START_CODE: