Matthew Waters f77f27f4c9 vp9parser: initialize subsampling to -1
The default value of 0 is a valid subsampling value and could be
confused with an 'unset' value.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3260>
2022-10-28 00:06:07 +00:00
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