[FFmpeg-trac] #3012(documentation:new): Incorrect examples for image2 demuxer regarding frame rate

[FFmpeg]

#3012: Incorrect examples for image2 demuxer regarding frame rate
-------------------------------------+-------------------------------------
             Reporter:  slhck        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  documentation                      |  master
             Keywords:  image2       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 [http://ffmpeg.org/ffmpeg-all.html#Examples-59 The documentation mentions]
 that in the following example "an input frame rate of 10 is assumed":

 {{{
 ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv
 }}}

 This, however, appears wrong to me. The frame rate according to which the
 input is read needs to be specified before `-i`. In the given examples,
 `-r 10` reads the input at 25 fps (default) and drops frames to achieve
 the final 10 fps output frame rate.

 [http://ffmpeg.org/trac/ffmpeg/wiki/Create%20a%20video%20slideshow%20from%20images
 The Wiki has a good explanation], so maybe the documentation could be
 updated in that regard.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3012>
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