[FFmpeg-trac] #8134(undetermined:new): [FFmpeg-vaapi][encode] caanot setup number of refference frames through `-refs` option

[FFmpeg]

#8134: [FFmpeg-vaapi][encode] caanot setup number of refference frames through
`-refs` option
-------------------------------------+-------------------------------------
             Reporter:  andreyor     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  ffmpeg-      |               Blocked By:
  vaapi                              |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by lizhong1008):

 From the
 code:https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/vaapi_encode_h264.c#L1043

 {{{
     av_assert0(pic->nb_refs <= 2);
     if (pic->nb_refs >= 1) {
         // Backward reference for P- or B-frame.
         av_assert0(pic->type == PICTURE_TYPE_P ||
                    pic->type == PICTURE_TYPE_B);
         vslice->RefPicList0[0] = vpic->ReferenceFrames[0];
     }
     if (pic->nb_refs >= 2) {
         // Forward reference for B-frame.
         av_assert0(pic->type == PICTURE_TYPE_B);
         vslice->RefPicList1[0] = vpic->ReferenceFrames[1];
     }

 }}}

 I doubt multiple referneces is supported.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8134#comment:2>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker