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

[ghvf jyg]

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:
> 
> 
> 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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