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qt/mp4mux: write vpcC box for VP9 tracks where possible

Matthew Waters requested to merge ystreet/gstreamer:mp4mux-vp9 into main

commit d1f97896

mp4mux: enable muxing VP9 streams

As specified in https://www.webmproject.org/vp9/mp4/

commit ff8c9bc8

qtmux: add support for writing vpcC box for VP9

Increases compatibility for VP9 in .mov in at least VLC.

commit bc668b3c

vp9parser: initialize subsampling to -1

The default value of 0 is a valid subsampling value and could be
confused with an 'unset' value.

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