msdkvpp: use NV12 as default format on srcpad
By default, sinkpad is NV12 format and srcpad is BGRA format, the different format will trigger an implicit format conversion in msdkvpp, which will cause performance drop.
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By default, sinkpad is NV12 format and srcpad is BGRA format, the different format will trigger an implicit format conversion in msdkvpp, which will cause performance drop.