[Bug 753090] videobalance: add condition about segment format check

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753090

--- Comment #3 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
PS: when trying to come up with a bug title or commit message summary line, try
to answer the question "What problem/issue does this fix?". We can look at the
patch to see *how* the problem was solved :)

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