matroskademux: Add support for relative position cues
Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-good/-/merge_requests/278
Cueing data can contain the block number within a cluster and/or a relative offset into the cluster.
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Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-good/-/merge_requests/278
Cueing data can contain the block number within a cluster and/or a relative offset into the cluster.