[FFmpeg-trac] #6476(undetermined:new): NVENC: "InitializeEncoder failed" error occurs when level 5.2 is specified

[FFmpeg]

#6476: NVENC: "InitializeEncoder failed" error occurs when level 5.2 is specified
-------------------------------------+-------------------------------------
             Reporter:  alexpigment  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  nvenc,       |               Blocked By:
  h264, level, 5.2                   |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When using h264_nvenc, if -level 5.2 is specified in the command line
 parameters, the following error is given:

 {{{
 [h264_nvenc @ 0546f2c0] InitializeEncoder failed: invalid param (8)
 Error initializing output stream 0:0 -- Error while opening encoder for
 output s
 tream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or
 height
 Conversion failed!
 }}}

 While NVENC via FFMPEG will similarly fail if trying to specify a level
 that is not valid for the current set of parameters, this case is
 different because it will fail even when the parameters are valid. Leaving
 off -level 5.2 in this scenario will produce a file that is Level 5.2.



 How to reproduce:
 {{{
 % ffmpeg -f lavfi -i smptebars -c:v h264_nvenc -s 3840x2160 -aspect 16:9
 -profile:v high -r 59.94 -level 5.2 -t 5 output.mp4
 }}}

 Confirm that the above code fails. Now do the same encode without
 specifying -level 5.2:

 {{{
 % ffmpeg -f lavfi -i smptebars -c:v h264_nvenc -s 3840x2160 -aspect 16:9
 -profile:v high -r 59.94 -t 5 output.mp4
 }}}

 Notice that this works, and produces a video that is Level 5.2 according
 to MediaInfo.



 ffmpeg version N-86330-gbd1179e
 built on 2017-06-01

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Ticket URL: <https://trac.ffmpeg.org/ticket/6476>
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