[Mp4-tech] [video] obmc and interlaced in ASP

Herbert Thoma tma iis.fhg.de
Wed Sep 15 15:21:00 EDT 2004


Dear Rahul,
in my opinion this is a problem with the bitstream. However, I would not
build a decoder that is so strict ...
I informed Yi-Shin Tung who is the editor of the MPEG-4 Visual Implementers Guide
List of Problem Reports document about the problem with this conformance bitstream.
Regards,
  Herbert.
ghvf jyg schrieb:
> Dear Herbert,
> 
> Thanks for that information. During the testing of my simple profile 
> decoder I found that the stream mit007.m4v (simple profile conformance 
> test stream) has video_object_type_indication set to 0 which is supposed 
> to be a reserved value. My decoder actually ensures that the stream 
> should have this value set to 1. Is this a problem with the bitstream or 
> should I remove that check from my decoder ?
> 
> Thanks and Regards
> 
> Rahul
> 
>  
> 
> 
> 
> */Herbert Thoma <tma iis.fhg.de>/* wrote:
> 
>     Rahul,
> 
>     You may want to take a look at the MPEG-4 Visual Implementers Guide
>     List of Problem Reports:
> 
>     http://www.chiariglione.org/mpeg/working_documents/mpeg-04/visual/visual_implementers_guide.zip
> 
>     There a number of problems with conformance bitstreams are
>     described. These problems will
>     be addressed in the upcoming visual conformance corrigendum.
> 
>     Regards,
>     Herbert
> 
>     ghvf jyg schrieb:
>      > Thanks for the replies. I was stuck decoding the two streams
>     mentioned
>      > by Toshi Horie, and that set me thinking whether ASP supports
>     OBMC or
>      > not. Since these streams are supposed to be part of the conformance
>      > test suite meant for ASP, how do I state that my decoder conforms
>     to ASP
>      > if it is not able to decode these streams.
>      > Regards
>      > Rahul
>      >
>      > */toshi.horie conexant.com/* wrote:
>      >
>     &! gt;
>      > Rahul,
>      >
>      > Most of your questions are answered in ISO 14496-2:2004 available
>      > online at the following URL.
>      >
>     http://www.iso.ch/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=39259
>      >
>      > Advanced Simple Profile decoders can handle Advanced Simple Visual
>      > Object Types and Simple Visual Object Types. Table 9-5 lists the
>      > coding tools available for Advanced Simple Visual Object Type.
>      >
>      > I think Advanced Simple Profile does not support OBMC, even though
>      > vcon-ge18.cmp and vcon-ge24.cmp seem to use it. /Someone please
>      > corrrect me if I'm wrong./ Certainly Table 9-1 says that OBMC is
>      > not supported for Simple Object Types, but it's not listed for
>      > Advanced Simple Object Types in Table 9-4.
>      >
>      > There is a small note under Table 9-4 that says "The interlace tools
>      > are not used for levels L0, L1, L2, and L3 of AS and FGS Profiles."
>      > For other level restrictions, see Table N-4.
>      >
>      > All of the conformance streams for ASP should be available at the
>      > Hannover ftp site accessed with the MPEG member login and password.
>      >
>      > Regards,
>      > Toshi Horie
>      >
>      >
>      >
>      > *"ghvf jyg" *
>      > Sent by: mp4-tech-bounces lists.mpegif.org
>      >
>      > 09/09/2023 05:37 AM
>      >
>      >
>      > To: mp4-tech lists.mpegif.org
>      > cc:
>      > Subject: [Mp4-tech] [video] obmc and interlaced in ASP
>      >
>      >
>      >
>      >
>      > Hi Everyone,
>      >
>      > I am working on Advanced Simple Profile (ASP). Does ASP support
>      > overlapped motion compensation (OBMC), IIs interlaced support in ASP
>      > is restricted to certain levels. Specifically where is this
>      > information documented.
>      >
>      > I also want to know where I can find the complete s! et of
>      > conformance streams for ASP. I could collect some from the
>      > Conformance Streams CD from ISO (the old version), while I could get
>      > some from the hannover ftp site. In all I have approximately 14-15
>      > of them, where can I find the remaining ones.
>      >
>      > I would appreciate any help on the above.
>      >
>      > Thanks and Regards
>      > Rahul
>      >
>      >
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>     -- 
>     Herbert Thoma
>     Group Manager Video
>     Multimedia Realtime Systems Department
>     Fraunhofer IIS
>     Am Wolfsmantel 33, 91058 Erlangen, Germany
>     Phone: +49-9131-776-323
>     Fax: +49-9131-776-399
>     email: tma iis.fhg.de
>     www: http://www.iis.fhg.de/
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> 

-- 
Herbert Thoma
Group Manager Video
Multimedia Realtime Systems Department
Fraunhofer IIS
Am Wolfsmantel 33, 91058 Erlangen, Germany
Phone: +49-9131-776-323
Fax:   +49-9131-776-399
email: tma iis.fhg.de
www: http://www.iis.fhg.de/


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