[FFmpeg-trac] #11663(avfilter:new): lv2 omitted values printed as NaN in help

8 Jul 2025


      #11663: lv2 omitted values printed as NaN in help
-------------------------------------+-------------------------------------
             Reporter:  Dave Flater  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:  LV2          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 lilv.h says about the function lilv_plugin_get_port_ranges_float, "If a
 port doesn't have a minimum, maximum or default value... the corresponding
 array element will be set to NaN."

 When the help option is used to print available controls and their valid
 ranges, libavfilter/af_lv2.c should omit the fields that contain NaNs,
 like lv2info does, rather than outputting the NaNs.  When a minimum or
 maximum is shown as NaN, it misleadingly suggests that a cursed numerical
 comparison with NaN might happen in a range check.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11663>
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