[M4IF Technotes] Re: about vlc

[Gary Sullivan]

+> -----Original Message-----
+> From: cloverleafland   mail.hongkong.com 
+> [mailto:cloverleafland   mail.hongkong.com] 
+> Sent: Monday, November 11, 2023 3:25 AM
+> To: technotes   lists.m4if.org
+> Subject: Re: [M4IF Technotes] Re: about vlc
+> 
+> 
+> hello,
+> 
+> Thanks for your reply,
+> Further Qs on vlc.. From the Table B-18 in the standard, 
+> when LEVEL = -2048 and 0, there's no code representing these 
+> two situation, it's stated with "forbidden" only. So may I 
+> know how to treat with these values?
Sending 0 doesn't make much sense - just increase the RUN if a
LEVEL value is zero.  And if you get the urge to send -2048,
just send -2047 instead.
+> Besides, from the standard, there are three modes to encode 
+> such situation when short_video_header = 0, May I knwo are 
+> there any criteria on which modes to be used for encoding? 
+> or we would simply freely choose one for encoding.
I think you can use whichever one you want.  In fact I think you
can use different escape coding methods for different coefficients
in the same IDCT block if you want to.  One good strategy may be
to use the escape coding method that uses the fewest bits for
each coefficient.
Best Regards,
-Gary S.
+> Thanks...
+> 
+> Regards,
+> Clover
+> 
+> > 
+> > Hai Cloverleafland,
+> > 
+> > Many possible combinations of runs and levels have no 
+> variable length code
+> > to represent them.
+> > In order to encode these statistically rare combinations 
+> an Escape Coding
+> > method is used.
+> > 
+> > Please refer the Standard: Chapter:  7.3 Texture decoding
+> >                          in particular : 7.3.1.3 Escape code
+> > 
+> > Regards,
+> > Vinayagam.M
+> > -----------------------------------------------
+> > M.Vinayagam
+> > Senior Software Engineer
+> > L&T Infotech Limited
+> > KIADB Industrial Estate,
+> > Hootagalli,
+> > Mysore - 571 186
+> > Tel: 91-821-40561 Ext:2613
+> > E-mail: vinayagam_m   yahoo.com
+> >  
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