Backport of "matroska-mux: allow width + height changes for avc3|hev1|vp8|vp9" into 1.20
Backport of !1657 (merged) "matroska-mux: allow width + height changes for avc3|hev1|vp8|vp9".
Commits:
Backport of !1657 (merged) "matroska-mux: allow width + height changes for avc3|hev1|vp8|vp9".
Commits: