[FFmpeg-trac] #10509(undetermined:new): `select` filter doesn't support `ih` and `iw` constants

[FFmpeg]

#10509: `select` filter doesn't support `ih` and `iw` constants
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  alexey.rodionov                    |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  filter       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Running e.g. the following command:

 {{{
 ffmpeg -i input.mp4 -vf select='gt(ih\,1080)',scale=-2:1080 output.mp4
 }}}

 causes the following error:

 {{{
 [Parsed_select_0 @ 00000196cee7f500] [Eval @ 00000087f25fe3d0]
 Undefined constant or missing '(' in 'ih,1080)'
 [Parsed_select_0 @ 00000196cee7f500] Error while parsing expression
 'gt(ih,1080)'
 [AVFilterGraph @ 00000196cee7f440] Error initializing filters
 Invalid argument
 }}}

 Support for `ih` and `iw` constants in the `select` filter would allow
 interesting complex one-line filters.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10509>
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