[Bug 765660] baseparse: use gst_util_uint64_scale to avoid overflow.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765660

--- Comment #5 from kevin <kevinbing.song at gmail.com> ---
I found the root cause is the special stream report invalid fps. It report
90000fps. So the calculate bitrate is very large and cause overflow.

We can add one invalid fps check in our special demuxer to fix the issue.

Our demuxer can demux the special stream. tsdemux will report fail.

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