ff_qsv_map_error  177 libavcodec/qsv.c     ret = ff_qsv_map_error(err, &desc);
ff_qsv_map_error  187 libavcodec/qsv.c     ret = ff_qsv_map_error(err, &desc);
ff_qsv_map_error  110 libavcodec/qsv_internal.h int ff_qsv_map_error(mfxStatus mfx_err, const char **desc);