diff -ru libtheora-1.1.1.orig/examples/png2theora.c libtheora-1.1.1/examples/png2theora.c

--- libtheora-1.1.1.orig/examples/png2theora.c	2009-08-22 20:14:04.000000000 +0200

+++ libtheora-1.1.1/examples/png2theora.c	2018-08-04 18:02:49.568313482 +0200

@@ -462,9 +462,9 @@

   png_set_strip_alpha(png_ptr);

   row_data = (png_bytep)png_malloc(png_ptr,

-    3*height*width*png_sizeof(*row_data));

+    3*height*width*sizeof(*row_data));

   row_pointers = (png_bytep *)png_malloc(png_ptr,

-    height*png_sizeof(*row_pointers));

+    height*sizeof(*row_pointers));

   for(y = 0; y < height; y++) {

     row_pointers[y] = row_data + y*(3*width);

   }