[FFmpeg-trac] #6858(undetermined:new): Create mosaic with original frame rate

[FFmpeg]

#6858: Create mosaic  with original frame rate
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             Reporter:  marcodea     |                     Type:  task
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Hello, I'm pretty new to video processing and I came across this usuful
 tool.
 Using the info I found on this web site I created a mosaic using four mp4
 files (original frame rate is 60 fps).

 I used the command described on the page and everything was fine, but the
 final output has 25 fps.

 -->    c:v libx264 output.mp4

 I'd like to produce a final file with the same video quality ad settings
 of original.

 I tryed to add option -crf 0 but it seems doesn't work.

 What are the right settings?

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Ticket URL: <https://trac.ffmpeg.org/ticket/6858>
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