FORUMS: list search recent posts

Downconverting Progressive HD footage to Interlaced SD footage

COW Forums : Sony XDCAM - EX & Related

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Dana Smillie
Downconverting Progressive HD footage to Interlaced SD footage
on Oct 19, 2009 at 1:50:38 pm

Hi. There have been many posts relating to converting HD to SD but none have addressed my specific needs.

I am shooting in 1080/25p
Client requires SD and wants it interlaced.

I have tried several workflows including:

1. -edit in HD
-create SD sequence with lower field dominance, interlaced
-drag HD sequence into the new SD sequence from browser.
-render, then output to MPEG-2 for transmission.

The techs at the other end keep telling me my footage is still single field.

Where do I need to take that step to convert the original Progressive material to Interlaced?


Return to posts index

Tim Kolb
Re: Downconverting Progressive HD footage to Interlaced SD footage
on Oct 20, 2009 at 1:00:29 pm

The 'techs' may be looking for field movement...which you won't have.

You only have 25 instances of movement every second. Whether it's progressive or interlaced, you won't have indications of 50 fields of movement...the two fields that the frame is divided into will both represent the same picture.

That said, putting the HD content on a SD interlaced timeline and outputting to MPEG as 25i should technically take care of it. Aesthetically, it will still look progressive.



TimK,
Director, Consultant
Kolb Productions,


Return to posts index

Dana Smillie
Re: Downconverting Progressive HD footage to Interlaced SD footage
on Oct 22, 2009 at 4:17:45 pm

the point is they don't want it to look progressive/single field. they want it interlaced.

clearly, shooting 1080/50i is the solution, but that doesn't change the existing 1080/25p stuff.

so i ask again, is there a way to convert 1080/25p to anything interlaced? i see all sorts of things to 'deinterlace' a piece of footage, is there any way to 'interlace' them?



Return to posts index


Rafael Amador
Re: Downconverting Progressive HD footage to Interlaced SD footage
on Oct 22, 2009 at 5:29:34 pm

Hi Dana,
Compressor should do it.
From each progressive frame will generate to fields.
You need to set the "Control Frame: ON".
In the Interlacing filter try best and better.
You should make a test with both settings.
If you don't get it in Compressor, then you need RE:VISION FieldsKit.
Is the best tool to deal with interlacing.
It have a proper re-interlacer.
In FC works only in 8b.
In AE in 32b.
Long rendering anyway.
rafael

http://www.nagavideo.com


Return to posts index

Tim Kolb
Re: Downconverting Progressive HD footage to Interlaced SD footage
on Oct 22, 2009 at 5:40:19 pm

However, keep in mind that most software is creating interlacing that's as "non-interlaced" looking as possible...

You have 25 instances every second...you need 50 for the footage to "look interlaced".

If it's not a ton of footage, it could theoretically be slow mo'd to 50%, creating an interpolated frame for each original frame...then render it out and speed it up to 200% in 50i...

There really isn't a short route. most "reinterlacing" in software or hardware is typically a signal re-format, not a picture re-format...it typically ends up PsF...progressive segmented frame...a progressive frame cut into two fields so equipment that wants fields has fields.


TimK

TimK,
Director, Consultant
Kolb Productions,


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]