No subject

 VisualObjectSequence() {	
 do {	 	 
         visual_object_sequence_start_code	 
         profile_and_level_indication	
         while ( next_bits()== user_data_start_code){	 	 
             user_data()	 	 
         }	 	 
         VisualObject()	 	 
      } while ( next_bits() != visual_object_sequence_end_code)	 	 
      visual_object_sequence_end_code	 
 }	 	 
This structure keeps the "visual_object_sequence_start_code" inside the do-while loop, on the other hand keeping the " visual_object_sequence_end_code" outside it;  which can be interpreted as "it is allowed to have a  visual_object_sequence_start_code without a visual_object_sequence_end_code before it. 
Do you also feel that something is wrong with the above structure? Some contradiction with the statement that Jayank has sent before in his mail, which I also totally agree:
[Jayank] "...it even clearly says that the visual bitstream may contain at most one instance of each of visualobjectsequence(), videoobject() and videoobjectlayer()... "
I would like to get more opinions on this, because this is really a critical issue from the decoder point of view. 
I alsowould like t know if there has beenany corrections made on this structure later on, since I could not check the 14996-2:2002.
Best Regards,
Emre
Emre Baris Aksu
Nokia corp.
> -----Original Message-----
> From: ext Peter Hsu [mailto:peter   mltc.com.tw]
> Sent: 30. August 2002 5:01
> To: Aksu Emre (NMP/Tampere); technotes   lists.m4if.org
> Subject: Re: [M4IF Technotes] Visual Object Sequence Start Code
> 
> 
> Hi, Emre Baris Aksu,
> 
> Yes, you can include more than one Visual Object Sequence 
> Start Code before
> a Visual Object Sequence End Code.
> 
> Peter Hsu
> MicroLinks Technology Corp.
> 21F, No.55, Chung Cheng 3rd RD., Kaohsiung, Taiwan 800, R.O.C.
> Tel: 886-7-2225678 Ext. 534
> Fax: 886-7-2225675
> E-mail: peter   mltc.com.tw
> 
> ----- Original Message -----
> From: <emre.aksu   nokia.com>
> To: <technotes   lists.m4if.org>
> Sent: Thursday, August 29, 2023 11:04 PM
> Subject: [M4IF Technotes] Visual Object Sequence Start Code
> 
> 
> Hello,
> I'd like to ask a question related to the Visual Object Sequence:
> 
> In an MPEG-4 visual bitstream, can there be more than one 
> Visual Object
> Sequence Start Code coming one after another without having a 
> Visual Object
> Sequence End Code to terminate the previous one, i.e. :
> 
> visual_object_sequence_start_code
> ...
> <bitstream>
> ...
> visual_object_sequence_start_code
> ...
> <bitstream>
> ...
> visual_object_sequence_end_code
> 
> 
> 
> Looking forward to receiving an answer,
> Best Regards,
> 
> Emre Baris Aksu
> Nokia Corp.
> 
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