[Bug 758620] Increase x264enc bitrate limit > 100Mbps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758620

--- Comment #4 from Arjen Veenhuizen <arjen.veenhuizen at tno.nl> ---
Unfortunately it turns out to be more complex than just one hard limit.
According to the official AVC spec (see [1] as well), bitrate limits are
profile related and capped at 720Mbps for High10-I-only 4K. But apparently even
x264 does not follow suit. In that case I would propose to stretch the limit on
our x264enc in line with x264 and disregard the limits imposed by the spec.

In case of x265, the highest bitrate is 76Gbps (!) according to the official
spec and [2].

[1] https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Levels
[2] https://en.wikipedia.org/wiki/High_Efficiency_Video_Coding_tiers_and_levels

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