[FFmpeg-trac] #1339(avfilter:new): Auto insert fps filter as adapter for overlay filter inputs with different framerates

[FFmpeg]

#1339: Auto insert fps filter as adapter for overlay filter inputs with different
framerates
-------------------------------------+-------------------------------------
             Reporter:  annorax      |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  fps overlay  |               Blocked By:
  filter                             |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by rogerdpack):

 I can (apparently) confirm that if the "overlay" is 30 fps and you use -r
 30 for the output, it doesn't show all of the overlay frames (it basically
 has a "master slave" relationship, with the master--the under frame--
 controlling frequency of output frames.  However I suppose one could get
 around this by (as the OP said) determining the frame rate, and
 increasing/decreasing it first before applying the filter, so the current
 behavior might be all right.  Either that or insert an fps filter
 automatically, as mentioned, but I'd almost prefer the current way (more
 explicit)...

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1339#comment:10>
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