I have found an easier way.  There is a deinterlace effect called "Spacial 
field swap" that does the trick for the most part.  Still, some sections have 
jerky motion instead of the jaggies like a field order reversal has.  I 
suspect the field order is not swapped within a frame but swapped between 
frames so instead of this:

1a+1b, 2a+2b, 3a+3b, ...

..it is this:

0b+1a, 1b+2a, 2b+3a, ...

Field sapping only results in this:

1a+0b, 2a+1b, 3a+2b, ...

It least that is what it appears.

I'm looking for a solution to this.

Regards,
David Koski
da...@kosmosisland.com

> On Fri, 10 Dec 2010 06:15:21 +0100, David Koski <da...@kosmosisland.com> 
wrote:
> > I have captured some video from my old hi-8 Sony using my LML33.  Parts
> > of the video obviously have swapped interlace frames but most of it is
> > corret.  Is there a filter or other method in Cinelerra to swap the
> > frames back?
> 
> I think the right combination of the effects "frames to fields"
> and "fields to frames" will do the trick.
> 
> 1) Set the project framerate to 50 frames per second (or 60 in NTSC land),
> 2) load the DV file
> 3) apply the "frames to fields" effect, set the field order that makes
>   the playback progress steadily, and not back-and-forth (Top field first
>   or Bottom field first)
> 4) Render this to an uncompressed, lossless format, if you can.
> 
> 5) Load the newly rendered, line-doubled progressive video into
>   Cinelerra, and apply fields to frames, with the appropriate
>   field order for DV.
> 
> 6) Now you still have one problem left: The project is still at
>   50 frames per second, and you need to discard every second
>   frame to get valid DV output.  The tedium!
> 
> 7) Consider using ffmpeg for this instead.  You can specify
>   field order on the command line, according to ffmpeg's man page.

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