vaapimpeg2enc can not encode mpeg2 stream correctly on iHD driver

gst-launch-1.0 videotestsrc num-buffers=100 ! video/x-raw, format=NV12 ! vaapimpeg2enc ! mpegvideoparse ! filesink location=out.mpeg2

report error 0:00:00.097441394 18806 0x21490f0 ERROR vaapi gstvaapiencoder.c:572:gst_vaapi_encoder_encode_and_queue: failed to encode frame (status = -1)

0:00:00.097472916 18806 0x21490f0 ERROR vaapiencode gstvaapiencode.c:731:gst_vaapiencode_handle_frame: failed to encode frame 0 (status -1)

0:00:00.097499887 18806 0x21490f0 WARN basesrc gstbasesrc.c:3072:gst_base_src_loop: error: Internal data stream error.

0:00:00.097508166 18806 0x21490f0 WARN basesrc gstbasesrc.c:3072:gst_base_src_loop: error: streaming stopped, reason error (-5)