> I am afraid that the computation is a bit more complex in the ISO (see
> http://www.staroceans.org.s3-website-us-east-1.amazonaws.com/e-book/ISO-14496-10.pdf
>
> <http://www.staroceans.org.s3-website-us-east-1.amazonaws.com/e-book/ISO-14496-10.pdf>)
> Divisor is not always 2, it could be 1, 2, 3,4 or 6.
Is this the “DeltaTfiDivisor” defined in the table on page 263 of that
specification? I find that rather hard to follow, considering (for example)
that the variable
∆tfi,dpb( n )
seems to be defined in two separate ways, just sentences apart:
When fixed_frame_rate_flag is equal to 1, for all n where n indicates
the n-th picture in output order and picture n is not the last picture in the
bitstream in output order, the value of ∆tfi,dpb( n ) is specified by ∆tfi,dpb(
n ) = ∆to,dpb( n ) ÷ DeltaTfiDivisor
and
When fixed_frame_rate_flag is equal to 1, the value computed for
∆tfi,dpb( n ) shall be the same for all n > 0 and shall be equal to
num_units_in_tick ÷ time_scale.
(with no mention of a divisor).
Ahh, the joys of dealing with a codec that’s designed by a committee :-)
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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