[FFmpeg-trac] #706(avfilter:new): scale filter doesn't understand »out_h«

[FFmpeg]

#706: scale filter doesn't understand »out_h«
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             Reporter:  taeuber     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:  scale       |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Changes (by saste):

 * analyzed:  0 => 1
 * reproduced:  0 => 1


Comment:

 Replying to [comment:2 taeuber]:
 > command line:
 > nice -n 9 ionice -c3 ffmpeg -i 2a.mpeg -an -sn -threads 0 -vf
 crop=in_w-0-16:in_h-6-2:0:6,scale=ow:oh/2,setsar=32:15 -c:v libx264
 -x264opts
 [...]

 scale=ow:oh/2

 you can reference "ow" and "oh" only when they have been defined, both
 "oh" and "ow" have not been defined yet here (you can't define something
 by referencing itself, at least not in this context).

 > Error opening filters!
 > Error when evaluating the expression 'oh/2'
 [...]

 Maybe this error message should be made more explicit...

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/706#comment:3>
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