It only matters what your "Field Motion" is set to per clip in the bin. If
you're in a 29.97i project, and you AMA link to a 23.98 clip, and Field
Motion is set to Progressive, the motion adapter will be correct (2:3
pulldown). If the Field Motion is set to Interlaced, or Unknown, the motion
adapter makes a guess and the guess is wrong (usually blended something).
John, if you were in a 29.97p project, the motion adapter would see
source:progressive, output:progressive, and most likely set to blended
interpolated. In other words, creating progressive frames that did not
exist in the source.
Always check Field Motion before transcoding. It is usually guessed
correctly with Avid-native codec stuff like P2 / XDCAM, and usually guessed
wrong with everything else.
On Wed, Apr 17, 2013 at 9:00 AM, electropura212 <electropura212@gmail.com>wrote:
> Had issues with this last year.
>
> Noted that doing the AMA link/transcode in a 23.98 project, then moving the
> bins into the 1080i 29.97 project achieved noticeably better looking
> results. The motion adapter applied in the 29.97 project handled the
> pulldown differently (and better!). Better still, it's not baked in...you
> can adjust it by promoting to Timewarp if it gets the cadence wrong.
>
> I think transcoding while converting frame rate is using Advanced Pulldown,
> which is really not so nice.
>
>
>
>
>
> On Wednesday, April 17, 2013, johnrobmoore wrote:
>
> > **
> >
> >
> > Well in 1080i the transcodes generate 2:3 pulldown like I would expect.
> So
> > what methodology is Avid using when I did the transcodes in 1080P/29.97?
> Is
> > it a fluid motion algorithm? If so does it lead to some of the potential
> > artifacts that fluid motion can generate? Just how is Avid making 5
> > seemingly unique psf frames from the original 24 frames of the ama clip?
> > Hmmmmm.
> >
> > --- In Avid-L2@yahoogroups.com <javascript:_e({}, 'cvml',
> > 'Avid-L2%40yahoogroups.com');>, John Moore <bigfish@...> wrote:
> > >
> > > So in my P2 extravaganza tonight I see something that I think I only
> > partially understand. When I look at ama linked DVCPro HD (720P/60)
> 23.98
> > clips and set my project to 1080i/59.94 I see a cadence of 2,2,2,4 but
> when
> > I look at the transcoded clips that are
> > >
> > > p, li { white-space: pre-wrap; }
> > >
> > > DNxHD 220 (HD1080p) and step field by field I see a 2,2,2,2,2 cadence
> > not 2:3. Is this some magic happening in the transcode because all 5 psf
> > frames are unique. Could I be getting fooled by the fact that I did the
> > transcodes while having the project set to 1080P/29.97. It's late but I
> > don't see any split frames as I step through field by field. I'm going to
> > redo the transcode while in 1080i/59.94 mode and see what happens then.
> > >
> > > John Moore
> > >
> > > Barking Trout Productions
> > >
> > > Studio City, CA
> > >
> > > bigfish@...
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Search the official Complete Avid-L archives at:
> http://archives.bengrosser.com/avid/
> Yahoo! Groups Links
>
>
>
>
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