[Mp4-tech] [H.264] Doubts about the te(v)

[Gary Sullivan]

Kata et al,
It's pretty simple.  
When there are more than two alternatives to choose from, it is the same as ue(v).
I.e., 1, 010, 011, 00100, 00101, 00110, ...
When there are only two alternatives to choose from (for example, when field_pic_flag is 0 and num_ref_idx_l0_active_minus1 is 1 and you are coding ref_idx_l0), using ue(v) would be silly, because the value 0 would be coded as 1 and the value 1 would be coded as 010.  This obviously wastes two bits whenever the value 1 is coded.  So those two trailing bits are dropped in that case.  In other words, the value 0 is coded as 1 and the value 1 is coded as 0.  The reasons it's referred to as a "truncated" code is that the useless trailing bits are cut off in this special case.
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: mp4-tech-bounces lists.mpegif.org 
+> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Heng-Lin Yen
+> Sent: Tuesday, March 29, 2024 11:35 PM
+> To: mp4-tech lists.mpegif.org
+> Subject: [Mp4-tech] [H.264] Doubts about the te(v)
+> 
+> Dear Experts,
+> 
+> As writen in the H.264 in spec 9.1 for truncated EG
+> code "te(v)",
+> when the syntax element is coded as te(v), the range
+> of the syntax element shall be determined first.
+> Does the "range of the syntax element" indicates the
+> range of syntax element vlue?
+> 
+> In addition, does anyone kindly show the table of
+> te(v)? 
+> Although the derivation for syntax element of te(v) is
+> described in spec 9.1,
+> I can't catch what it means exactly.
+> 
+> Thanks in addvance.
+> 
+> Best regards,
+> Kata
+> 
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