[FFmpeg-user] Inverse Telecine with fieldmatch filter

[Carl Eugen Hoyos]

L. Lee <llee040 <at> sbcglobal.net> writes:

> >> For 720p I used your suggestion to interlace and deinterlace:
> >
> >(I should add that I meanwhile realized it may be
> >faster to use fps=30000/1001 instead of interlace)
> 
> You're not suggesting that the output file should be 
> 30 fps, are you?

(skip this)

No, I am suggesting that instead of using the interlace 
filter (that needs not much but some computation power) 
you can use the fps filter that does the same for this 
use-case (and should need no computation power at all).

If you cannot reproduce a speed gain, it may make no 
difference.

(until here)

What I probably meant (iirc) was that you could try to 
remove both the interlace and the fieldmatch filter and 
instead use fps (as above) and decimate.
If you trust the television provider to have done their 
work correctly, the output should be identical but 
much less cpu power will be needed.

(Remember that your input is not strictly telecined but 
telecined and deinterlaced, it may also be "telecined" 
by simply repeatings frames - instead of fields - which 
would be simpler for the provider and would not need 
fieldmatch at all.)

Carl Eugen