[MEncoder-users] interlaced/non-interlaced

[Reimar Döffinger]

On Sat, Oct 09, 2010 at 07:24:50AM +0200, Toerless Eckert wrote:
> No, i totally do not understand that. Assume i have 25p material and
> want to broadcat it as 50i. What i do then is that i just split
> up every frame into even and odd lines and broadcast first the odd
> lines as one field and then the even lines as the second field. Of course
> i shuold be able to recombine these two fields to a full frame without any
> loss.

Yes, and it's one of the reasons why the encoding method is useless to
decode whether something is indeed interlaced or not.
It is no problem at all to encode 25p as 50i (I don't know any encoders
that need you to split the frame into fields for that, it is just a
question of setting the encoder options), as long as you don't care
about maybe 20% loss in encoder efficiency.
You can also encode interlaced content as progressive, as long as
you don't mind in that case really horrible quality.
There are obviously even peopl who have no problem scaling interlaced
content like progressive, though those really deserve an angry mob
hunting them for excessive cruelty to innocent video material :-)