[FFmpeg-user] Capture 1080 50i from decklink

[Andy Furniss]

Maxim Kozlov wrote:
> 2015-04-17 19:33 GMT+03:00 Andy Furniss <adf.lists at gmail.com>:
>
>> I think 1080i25 is the correct way to describe "50i" - if what is
>> captured are weaved frames then there are only 25 of them per sec.
>>
>
> How to deinterlace such signal(convert true 1080i50 to 1080p25)
> without degrading quality?

If it is "true 1080i50" then deinterlacing to 25p will half the temporal
resolution, 50p would retain it.

ffmpeg has several deinterlacers yadif is good. yadif=0 will give 25p
yadif=1 will give 50p.

Do you really need to deinterlace anyway would be another question - if
the content is actually progressive you don't need to.

If it is interlaced you could keep it as interlaced and let the
user/player/tv deinterlace it.