[FFmpeg-trac] #10124(undetermined:new): NVENC h.264 reference frames over 4 causes error

[FFmpeg]

#10124: NVENC h.264 reference frames over 4 causes error
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  CaptainObvious                     |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  5.1.2
  undetermined                       |
             Keywords:  NVENC,       |               Blocked By:
  reference frames, refs             |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Trying to use FFmpeg/NVENC to encode 1080p 23.976fps Blu-ray AVC files
 that don't need re-encoding in Architect Pro (unsuccessfully, so far).
 Hardware is a 2080 Ti, current drivers 527.56.

 In trying to emulate a known working file, one of the things I need to do
 is produce a video with 5 reference frames. As I understand it, h.264 spec
 allows up to 16 reference frames, so this shouldn't be an issue.

 When "-refs 5" or higher is specified, FFmpeg fails with error:
 "[h264_nvenc @ hhhhhhhhhhhhhhhh] InitializeEncoder failed: invalid param
 (8): Invalid Level."

 When "-refs 4" or lower is used, no problem. Have tried this on the
 current release version 5.1.2-full_build-www.gyan.dev and the latest
 nightly from Dec 25, 2022.

 I've simplified the following command-line significantly:

 {{{
 ffmpeg -y -i "input.mp4" -c:v h264_nvenc -bluray-compat 1 -b:v 1500000
 -bufsize 1500000 -maxrate 3000000 -level 4.1 -profile:v high -refs 5
 "output.264"
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10124>
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