[FFmpeg-trac] #1339(avfilter:new): Auto insert fps filter as adapter for overlay filter inputs with different framerates
FFmpeg
trac at avcodec.org
Mon May 21 21:30:28 CEST 2012
#1339: Auto insert fps filter as adapter for overlay filter inputs with different
framerates
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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 reimar):
The most obvious reason why it is not a general solution is that not all
inputs have a (fixed) framerate or something that is a suitable
substitute.
Even in a very simple case of overlaying a 24 fps video with a 25 fps one,
"equalizing" the fps will not lead to a good result. If you change the 24
fps one to 25 fps that will result in noticeable stutter once a second,
for exact results you'd have to go to an insane 600 fps.
If the overlay filter were taking both timestamps into account you could
get an _exact_ (though variable fps) output with at most 49 frames per
second (though those frames would be at very variable intervals and a lot
of players would have problems displaying it accurately I admit, so the
win may be questionable in real-world use).
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1339#comment:3>
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