Commit 162e7bd2 authored by Edward Hervey's avatar Edward Hervey 🤘 Committed by Edward Hervey
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mxfvanc: Handle empty ANC essence

Not having any *actual* ANC is totally fine and common usage with several MXF
variants.

In order to properly advance the streams, the essence handler returns an empty
GAP buffer which gets converted to a GST_EVENT_GAP.

Part-of: <!2345>
parent d9c48635
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