lavfi/vulkan_filter: fix input format
Otherwise s->input_format is always yuv420p. This fixes invalid output format for hwframe download in the command below: ./ffmpeg -init_hw_device vulkan -f lavfi \ -i testsrc=duration=1,format=nv12 \ -vf 'hwupload,format=vulkan,scale_vulkan=1024:768,hwdownload,format=nv12' \ -f null - Reviewed-by:Lynne <dev@lynne.ee> Signed-off-by:
Haihao Xiang <haihao.xiang@intel.com>
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