[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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