[M4IF Technotes] About DivX ( Was Re: reference code advise)

[Rob Koenen]

I'm sure someone is listening :-)
Rob
> -----Original Message-----
> From: Ben Waggoner [mailto:ben   interframemedia.com] 
> Sent: Thursday, December 05, 2023 9:00 PM
> To: technotes   lists.m4if.org
> Subject: [M4IF Technotes] About DivX ( Was Re: reference code advise)
> 
> 
> Rob,
> 
>     Specifically, most DivX files use MPEG-4 (simple or 
> advanced simple) video and MP3 audio in the AVI file format.  
> These are obviously not MPEG-4 compliant.  They sometimes use 
> VBR MP3 audio, which isn't really AVI compliant either, which 
> is why tools like QuickTime often have sync issues playing 
> back .divx files.
> 
>     DivX 4 was Simple only, and DivX 5 is Simple or Advanced 
> Simple.  DivX 3 was a hacked version of the early MS MPEG-4 
> codecs that weren't compliant with the final MPEG-4 spec.  
> Lots of these are still around, alas.
> 
>     .AVI doesn't have any technical advantages over MPEG-4, 
> and many many disadvantages, so it'd be great if DivXNetworks 
> would adopt .mp4 with AAC audio as their standard file 
> format.  Their tools can do .mp4 export right now, but 
> without audio.  They weren't included in the NerdTV shootout 
> for that reason.  Their video codec is quite good, though.  
> 2-pass support and some novel quality optimization techniques.
> 
> Ben Waggoner <http://www.benwaggoner.com>
> Compressed Video Consulting, Training, and Encoding
> 
> My Book:            http://www.benwaggoner.com/books.htm
> Compression Books:  http://www.benwaggoner.com/bookshelf.htm
> 
> 
> 
> on 12/5/02 19:57, Rob Koenen at rob.koenen   m4if.org wrote:
> 
> > 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.
> 
> 
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