Is H.264/AVC multiple reference mode (dwMaxNumRefFrames>1) supported in LOW_LATENCY_HQ?

Gaming and Visualization Technologies Video Processing & Optical Flow
1

Hi all

i have a problem in setting multiple :

  1. i apply NvEnc in low latency mode (no B frames) and set dwMaxNumRefFrames=2
  2. In generated h264 stream the sequence header contains max_num_ref_frames=2 and moreover max_dec_buffering=2 (as expected when dwMaxNumRefFrames=2).
  3. However, in PPS header num_ref_idx_l0_active set to 1 (instead of 2) and all inter slices are coded in the single reference mode.

Apparently, NvEnc disables activation of multiple reference mode. Maybe because the low latency?

2

Hi,

This is an expected behavior as NVENC supports only one reference frame for P-frame up to pascal generation GPUs.

Thanks,
Ryan Park