avfilter/vf_libplacebo: list AV_PIX_FMT_VULKAN first

Under normal circumstances, this change does not affect anything, as the vast
majority of filters either support only vulkan or only software formats.
However, when a filter supports both (such as vf_libplacebo itself, and
possibly vf_scale in the future), linking together two such filter instances
without an explicit format will default matching the input format, resulting
in a redundant round trip through host RAM.

This change bumps up AV_PIX_FMT_VULKAN to the first entry in the format list,
ensuring that it gets preferred whenever possible.

0 files changed, 0 insertions, 0 deletions