[FFmpeg-devel] [PATCH] avfilter: add framerate video filter

Carl Eugen Hoyos cehoyos at ag.or.at
Fri Aug 28 10:55:18 CEST 2015

Robert Kr├╝ger <krueger <at> lesspain.de> writes:

> > > > Shouldn't this be:
> > > > ... required to deinterleave before and 
> > > > interleave after this filter.
> > > > ?

> From my understanding what the filter does and what 
> the visual results of each option would be

You mean you tested deinterleaving and interleaving 
and it doesn't work or looks bad?

> I would guess the text is meant as it is written

I of course did not say that the current text means 
something else than what is written.
(Just that it may not be the best solution for the 
given issue, both quality- and speed-wise.)

> especially since Mark is both a native english 
> speaker and a very competent broadcast professional 
> but that's just my 2c.

Just to make sure I don't misunderstand you:
It is not the arguments that count but who makes them?

But seriously: I can imagine (and I assume that is 
why you are saying my suggestion above is bad) that 
the deinterleaving can lead to artefacts (shadows) on 
top and bottom of the output file (assuming the 
"right" input) and should therefore be avoided.
But in that case it should still be faster (and 
produce cleaner output) than deinterlacing to split 
the input video, use two framerate instances for the 
two fields of the input video and interleave the two 
output links of the two framerate instances.

Carl Eugen

More information about the ffmpeg-devel mailing list