[Bug 776238] dvbsuboverlay: don't composite if cannot map frame

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776238

--- Comment #5 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
ping?

@slomo, another reason to not raise an error is with non-mappable dmabuf-based
buffers.

Can we assume that all the buffers are non-mappable after the first tried and
enable a passthrough mechanism?

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