errors in valgrind

Hay!

Has anyone come across these errors using valgrind for the oggenc tool or the 
encoder_example.c:

==13108== Invalid read of size 4                                                                                                            
==13108==    at 0x4155734: _vp_offset_and_mix (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                        
==13108==    by 0x415F598: mapping0_forward (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                          
==13108==    by 0x4151C8B: vorbis_analysis (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                           
==13108==    by 0x804F3E5: oe_encode (in /usr/local/bin/oggenc)                                                                             
==13108==    by 0x804B9FB: main (in /usr/local/bin/oggenc)                                                                                  
==13108==  Address 0x440d908 is 0 bytes after a block of size 2,048 alloc'd                                                                 
==13108==    at 0x4026132: calloc (vg_replace_malloc.c:397)                                                                                 
==13108==    by 0x414F88D: vorbis_analysis_init (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                      
==13108==    by 0x804ED2A: oe_encode (in /usr/local/bin/oggenc)                                                                             
==13108==    by 0x804B9FB: main (in /usr/local/bin/oggenc)                                                                                  
==13108==                                                                                                                                   
==13108== Invalid read of size 4                                                                                                            
==13108==    at 0x4155734: _vp_offset_and_mix (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                        
==13108==    by 0x415F6D4: mapping0_forward (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                          
==13108==    by 0x4151C8B: vorbis_analysis (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                           
==13108==    by 0x804F3E5: oe_encode (in /usr/local/bin/oggenc)                                                                             
==13108==    by 0x804B9FB: main (in /usr/local/bin/oggenc)                                                                                  
==13108==  Address 0x440d908 is 0 bytes after a block of size 2,048 alloc'd                                                                 
==13108==    at 0x4026132: calloc (vg_replace_malloc.c:397)                                                                                 
==13108==    by 0x414F88D: vorbis_analysis_init (in 
/usr/local/lib/libvorbis.so.0.4.1)                                                      
==13108==    by 0x804ED2A: oe_encode (in /usr/local/bin/oggenc)                                                                             
==13108==    by 0x804B9FB: main (in /usr/local/bin/oggenc) 

==13108== ERROR SUMMARY: 4974 errors from 3 contexts (suppressed: 3 from 
1)
==13108== malloc/free: in use at exit: 0 bytes in 0 blocks.
==13108== malloc/free: 1,968 allocs, 1,968 frees, 3,167,627 bytes allocated.
==13108== For counts of detected errors, rerun with: -v
==13108== All heap blocks were freed -- no leaks are possible.

I was just checking to see if there were errors and this is what I found.
Any clues!

THKS
Radmin