[FFmpeg-trac] #1717(avfilter:new): Concat filter can not join more than two video files

[FFmpeg]

#1717: Concat filter can not join more than two video files
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             Reporter:  chinshou  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 using latest ffmepg build from
 http://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-20120903-git-
 5d55830-win32-static.7z

 execute following command
 ffmpeg -i a1.jpg -i a2.jpg -i a3.jpg -filter_complex "[0:0] [1:0] [2:0]
 concat=n=3:v=1:a=0" join.mp4

 to join three jpeg files to one video, But the generated mp4 file only
 contain two frames.

 ffmpeg -i join.mp4 test%d.jpg

 only output test1.jpg and test2.jpg

 best regards

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1717>
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