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Just as in basetextoverlay [1], the frame to blend with the subtitles overlay should be mapped with flags GST_MAP_READWRITE, because gst_video_overlay_composition_blend() does both operations. 1. https://cgit.freedesktop.org/gstreamer/gst-plugins-base/commit/?id=1396f804 Signed-off-by: Víctor Manuel Jáquez Leal <vjaquez@igalia.com> https://bugzilla.gnome.org/show_bug.cgi?id=771382
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