[M4IF Technotes] mpeg4-video : MB-Quant vs 4MV

[Gary Sullivan]

I think Sekhar's description is correct.
I believe there is this restriction.
This was probably not a great design choice.
-Gary
+> -----Original Message-----
+> From: Chandra Sekhar Reddy G [mailto:gchandra   tataelxsi.co.in] 
+> Sent: Tuesday, January 29, 2024 8:55 PM
+> To: M4IF TechNotes
+> Subject: [M4IF Technotes] mpeg4-video : MB-Quant vs 4MV
+> 
+> 
+> Hi All,
+> 
+> The Mpeg4-Video-Standard prohibits Quant and 4MV to be 
+> present in the same
+> Macroblock.
+> There may be some cases, where this will be useful.
+> 
+> e.g.., in the encoder,
+> 1. when we do MB-level bit-rate-control, we may need to send 
+> Quant, if we do
+> that, we can not go for 4MV.
+> 2. we may have decided to go for 4MV for that macroblock, if 
+> we do that, we
+> can not do MB-level bit-rate/quality control (by changing Quant).
+> that means, you have to only one tool, either "MB-level 
+> bit-rate/quality
+> control" or "4MV ".
+> 
+> Why such restriction in the standard?
+> I think, that choice should have been left for the 
+> intelligence of the
+> Encoder.
+> 
+> Regards,
+> Chandra
+> 
+> 
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