[Mp4-tech] RATE CONTROL METHODS

[Gary Sullivan]

Yes, I believe there are differences, although you would have to read
the algorithm description documents (or a software implementation of
them) to figure out exactly what they are.  You're kind of mixing MPEG-4
and H.263 in your question.   The relevant algorithms in the H.263 world
would be called TMNx, where x is a revision level.
The relevant algorithms in the MPEG-4 part 2 community would be called
VMx.  The relevant algorithms in the MPEG-4 part 10 community (a.k.a.
H.264 or AVC) would be called JMx (or TMLx for older ITU versions).
I don't recall the exact revision numbers, but at some point the rate
control methods in the TMN and VM versions became considerably more
sophisticated than the relatively crude method in TM5.  I'm cc'ing one
of the key contributors to that work.
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: mp4-tech-bounces lists.mpegif.org 
+> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of 
+> Andrea D'Amata
+> Sent: Saturday, August 28, 2023 10:41 AM
+> To: mp4-tech lists.mpegif.org
+> Subject: [Mp4-tech] RATE CONTROL METHODS
+> 
+> Dear experts,
+> I am new in this mailing list , and I am new in video 
+> coding: are there any
+> differences between TM5 rate control and TMN5 rate control?
+> Does it make sense comparing experimental results (number of 
+> encoded frames
+> and PSNR) obtained using TM5 RC in an MPEG4 codec (no VOP) with those
+> obtained using TMN5 RC in a H263 one?
+> 
+> 
+> Thank You for Your attention.
+> 
+> Andrea
+> 
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