[FFmpeg-user] Capture 1080 50i from decklink

[Carl Eugen Hoyos]

Maxim Kozlov <rogat1y <at> gmail.com> writes:

> > 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 a progressive 25 frames video is encoded as 50 
interlaced fields, you should after decoding with 
FFmpeg get your original 25 frames: FFmpeg does 
not know fields internally, only frames.

Real interlaced material can of course not be 
deinterlaced without degrading quality (compared 
to the original progressive material): The 
information is lost.

Carl Eugen