[Mp4-tech] Frame rate in h.264

[John Cox]

Hi
Later in the text Delta t_{fi,dpb} is set to be equal to t_c which is
defined in equation (C-1) as num_units_in_tick / time_scale
JC
>On Mon, 18 Jul 2005, John Cox wrote:
>
>>The table you need to look at is E-6 (under the description of
>>fixed_frame_rate_flag).
>>
>>Once you've worked through all the verbiage what it says is that the
>>duration of a field picture is 1x num_units_in_tick/time_scale and the
>>duration of a frame picture is 2x num_units_in_tick/time_scale. (If you
>>specify pic_struct then other options are available too for 3/2 pull
>>down etc.)
>
>Hi, I'm trying to go through this, but I can't find anywhere
>what does the symbol \Delta t_{fi,dpb} mean or where it is used?
>
>\Delta t_{o,dpb} seems to be more or less defined in Eqs.
>(C-12) - (C-13).
>
>As you refer to Table E-6 I suppose I need to understand
>the symbol to understand why
>2 * num_units_in_tick / time_scale = frame_time
>for progressive video.
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