lavfi/vf_vpp_qsv: only add the given output sw format to output pad
Otherwise the output format is not changed when output is in system
memory. For example, the output format is still p010le in the following
case:
$ ffmpeg -qsv_device /dev/dri/renderD128 -f lavfi -i testsrc -vf
"format=p010le,vpp_qsv=extra_hw_frames=8:format=nv12" -f null -
...
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf60.4.100
Stream #0:0: Video: wrapped_avframe, p010le(tv, progressive), 320x240
[SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn
Signed-off-by:
Haihao Xiang <haihao.xiang@intel.com>
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