[FFmpeg-trac] #1445(undetermined:new): image2 to support start_index and step_increment

[FFmpeg]

#1445: image2 to support start_index and step_increment
-------------------------------------+-------------------------------------
             Reporter:  burek        |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  wish
  undetermined                       |                  Version:
             Keywords:               |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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 image2 could be improved to support 2 new parameters, namely start_index
 and step_increment (or similar), that would be used like this:

 for encoding:
 {{{
 ffmpeg -i input -f image2 -start_index 14 -step_increment 3 out%04d.png
 }}}
 this would produce following files: out0014.png, out0017.png, out0020.png,
 out0023.png, ...


 for decoding:
 {{{
 ffmpeg -f image2 -start_index 14 -step_increment 3 -i in%04d.png
 }}}
 this would expect following files on input: in0014.png, in0017.png,
 in0020.png, in0023.png, ...

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1445>
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