[M4IF Technotes] reference code advise

[Rob Koenen]

Gerardo,
The reference code is not optimized. A better idea of quality vs bitrate
is probably obtained using a commercial product. 
DivX video coding is supposed to be compliant, the file format is
different
as I understand it. As you can see from the M4IF home page, DivXNetworks
recently joined the M4IF interop program. 
I will send you a Motorola person to contact for more info in a private
email.
Rob
-----Original Message-----
From: D400 Phu [mailto:Phu   Cheertek.com.tw] 
Sent: Thursday, December 05, 2023 5:27 PM
To: Rosiles Gerardo-ra9355
Cc: technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] reference code advise
To my knowledge, C code MoMuSys is implemed based on Unix while C++
Microsoft code on Windows..
There are some minor glitches on MoMusys Dec 2000 version   such as
interlaced ...
If your target is to tranplant to an embedded platform.. C version MMS
will be convenient..
http://www.iso.ch/iso/en/ittf/PubliclyAvailableStandards 
The official souce code can be obtained from ISO/IEC site  ... however
you need to try many times due to busy networks...
Dvix is an ASP profile of MP4, DVix can decode bitstreams created from
MMS ,MS...
Best
Po-Chin
-----Original Message-----
From: Rosiles Gerardo-ra9355 [mailto:Gerardo.Rosiles   motorola.com]
Sent: Friday, December 06, 2023 8:49 AM
To: 'technotes   lists.m4if.org'
Subject: [M4IF Technotes] reference code advise
Hello,
  I am newcomer to this list, and recent student of MPEG-4. I have done
some searching for reference code and have found a few options that
people in this group must know. I would like to request advise on which
of this code bases is more recommended for merely doing quality vs.
bitrate comparisons between AS, ASP,  and also MPEG-2 (I do have a codec
for this).
This is what I have dig out from the web:
MoMuSys-FDIS-V1.0-990812
microsoft-vfdis-v10-990812
MoMuSys-FPdAM1-1.0-001220_sony-021017_KDDI
MoMuSys-FDPAM1-1.0-021915_nctu
I understand the naming convention, but I wonder if there is any
preference amongst the community towards a particular version. In
particular, I found it cumbersome the way the -990812 codes require to
arrange each input frame on a separate directory. Is there any version
that reads a single concatenated YUV file?
Also got the code for Xvid and MPEG4IP.  Are these any better than the
above?
Finally I am trying to understand what is the role of MPEG-4 in DivX. Is
the main difference that the file format they are using is not
standarized, or are there any other significant differences (from the
decoder perspective)?
Thanks for your help, 
-Gerardo
Gerardo Rosiles - Advanced Solutions Group 
Gerardo.Rosiles   motorola.com 
32-bit  Embedded Controller Division, Austin TX
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