Vorbis dev - Jul 2005 - Reg. page_sequence_number in the ogg header.

Hi,
I was looking at some of the vorbis-ogg music files using hexedit.
I am a bit confused about this filed "page_sequence_number" that
appears
in the header for ogg. From RFC3533 the definition of this field is:
"page_sequence_number: a 4 Byte field containing the sequence
       number of the page so the decoder can identify page loss.  This
       sequence number is increasing on each logical bitstream
       separately.
"
 From the above I gather that every new page will have a page number 
that increases sequentially for example, 1, 2, 3, 4 .. etc.

However when i peek into the actual ogg files containing vorbis encoded 
data, i see the sequence numbers to increase as
0, 4, 8, 9, 15, 18 etc.. and not sequentially.,,.
Is there any particular reasone for this?
Shashank

> However when i peek into the actual ogg files containing vorbis encoded
> data, i see the sequence numbers to increase as
> 0, 4, 8, 9, 15, 18 etc.. and not sequentially.,,.
> Is there any particular reasone for this?
Is it because not every page is the same size?  How are you getting these 
sequence numbers?

-- 
Graham Mitchell - computer science teacher, Leander High School
A girl and a boy bump into each other -- surely an accident.
A girl and a boy bump and her handkerchief drops -- surely another accident.
But when a girl gives a boy a dead squid -- *that had to mean something*
	-- S. Morganstern, "The Silent Gondoliers"

On Fri, Jul 29, 2005 at 03:09:43PM -0500, Shashank Khanvilkar wrote:
> I was looking at some of the vorbis-ogg music files using hexedit.
> [...]
> However when i peek into the actual ogg files containing vorbis encoded 
> data, i see the sequence numbers to increase as
> 0, 4, 8, 9, 15, 18 etc.. and not sequentially.,,.
Are you sure you're seeing all the page boundaries? A text search for
"OggS"
in the hexedit output will miss any that happen to span a 16-byte break.

 -r

On 7/29/05, Shashank Khanvilkar <shashank@mia.ece.uic.edu>
wrote:
> However when i peek into the actual ogg files containing vorbis encoded
> data, i see the sequence numbers to increase as
> 0, 4, 8, 9, 15, 18 etc.. and not sequentially.,,.
> Is there any particular reasone for this?
> Shashank
You either made a mistake, and missed many of the pages, or this file
was created with an extremely buggy encoder. The page numbers will
definately be sequential in a valid ogg vorbis file.

Mike