[M4IF Technotes] MPEG-4 Video Encoder Testing

[Manu V Batura]

We have found that both Microsoft and Momusys reference decoders are based
on
a previous version (or Working draft) of the standard (atleast with respect
to marker bits to be specific).
Here is the exact difference:
The Video Object Plane part of syntax shows a marker bit after
vop_vertical_mc_spatial_ref
but the working draft as well as both reference softwares do not have this
marker bit.
Does anybody know about more such differences? It will help us know too.
Regards,
Manu
-----Original Message-----
From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf Of Manu V Batura
Sent: Thursday, July 11, 2023 1:58 PM
To: technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] MPEG-4 Video Encoder Testing
For Technotes forum.
Regards,
Manu
-----Original Message-----
From: Rob Koenen [mailto:rkoenen   intertrust.com]
Sent: Thursday, July 11, 2023 11:16 AM
To: 'manu.batura   patni.com'; Rob Koenen
Subject: RE: [M4IF Technotes] MPEG-4 Video Encoder Testing
> But are the ISO provided Referebce Software (Microsoft &
> Momusys) fully MPEG-4 standards compliant?

The reference SW  *IS* the standard (part 5 of MPEG-4 actually) and
as such it is standards-compliant by definition.
> I have heard that Microsoft provided MPEG-4 Codec is not fully
> MPEG-4 standards compliant. Is that correct?

There are some very minor discrepancies between the text (in the case
of Visual, part 2) and the reference SW (part 5).
These are being corrected as we write.
Sometimes this requires an update in the text, sometimes in the SW.
To the best of my knowledge, there is no reason to assume that the
Microsoft version of the reference SW is more affected by these pesky
little details than the MoMuSys part of it.
Best,
Rob
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