[FFmpeg-trac] #2495(avutil:open): Better filter help

[FFmpeg]

#2495: Better filter help
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             Reporter:  jbvsmo          |                    Owner:
                 Type:  enhancement     |                   Status:  open
             Priority:  wish            |                Component:  avutil
              Version:  git-master      |               Resolution:
             Keywords:  option default  |               Blocked By:
             Blocking:                  |  Reproduced by developer:  1
Analyzed by developer:  1               |
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Comment (by jbvsmo):

 Replying to [comment:1 saste]:
 > An expression is just a string, so in general you can't specify a range
 in the option definition.

 The "AVOption" struct has the fields "min" and "max" so they could
 probably be set with what the expression expects.

 [PS: I don't want to open another bug report, but there are other small
 inconsistencies in the docs (that are right in the -help option) like the
 "noise" filter had the "q" flag removed but the filters.texi still has it.
 ]

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2495#comment:2>
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