There is a known bug with no solution that QSV encoder fails on resolutions less than 768x576. With that low resolution there is very little benefit to using QSV, and only much worse quality than x264 (hardware encoder turned off).
There is a known bug with no solution that QSV encoder fails on resolutions less than 768x576. With that low resolution there is very little benefit to using QSV, and only much worse quality than x264 (hardware encoder turned off).