[Bug 775306] codecparsers: h264parse: improve documentation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775306

--- Comment #4 from Anton Eliasson <devel at antoneliasson.se> ---
I actually don't know what cbr_flag is used for, but quoting the standard
(ITU-T H.264 02/2016):

> cbr_flag[ SchedSelIdx ] equal to 0 specifies that to decode this bitstream by the HRD using the SchedSelIdx-th CPB specification, the hypothetical stream delivery scheduler (HSS) operates in an intermittent bit rate mode.
> cbr_flag[ SchedSelIdx ] equal to 1 specifies that the HSS operates in a constant bit rate (CBR) mode. When the cbr_flag[ SchedSelIdx ] syntax element is not present, the value of cbr_flag shall be inferred to be equal to 0.

In other places, VBR is mentioned when cbr_flag is not set. I think the spec
just use the terms interchangeably.

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