qsv_device_derive_from_child 1219 libavutil/hwcontext_qsv.c return qsv_device_derive_from_child(ctx, MFX_IMPL_HARDWARE_ANY, qsv_device_derive_from_child 1272 libavutil/hwcontext_qsv.c return qsv_device_derive_from_child(ctx, impl, child_device, 0);