Tuesday, December 15, 2015

Re: [Avid-L2] Re: What happens under the hood between a progressive and interlace

 

Curious - I wonder what MC would do with an 18 fps file? I would think it would apply the pulldown you expect, since that's the simplest math. I would link the file and cut it into a 24p project sequence. See what it does when you step through.

Otherwise, I bet Media Encoder or Compressor (using Frame Controls - Fast retime) would handle this accurately.

On Tue, Dec 15, 2015 at 7:31 PM, Steve Mullen dvcinlv@gmail.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:
 

> "Given Avid deals with progressive material in a Psf manner"
>
>> is not true. PsF is ONLY a transport vehicle



Correct.
 
Cameras that record PsF do so only when an each frame is captured by a progressive sensor [ProgressivesegmentedFrame]. Odd and even lines [ProgressivesegmentedFrame] are treated during transport as "interlaced" which allows the media to be played back on interlace devices.

PsF is intended to be edited as progressive -- 1080p30 -- video because an entire frame  [ProgressivesegmentedFrame] was captured at the same time. An NLE should recognize the PsF tag and mark it as progressive.

If PsF isn't marked correctly, you will be able to step from "field" to "field" making you think you have interlaced video.  Do Not Deinterlace. Manually change it to progressive. It can be mixed with 1080i60 video and exported as 1080i60.

Since there is no 480p30 video, it's likely the PsF tag is ignored and the video will be marked as 480i60. Do Not Deinterlace.

Now a quick OT question -- does anyone know of OSX software that supports selecting or defining a 1:1:2 pulldown to convert an 18fps file to a 24fps file?




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Posted by: Mark Spano <cutandcover@gmail.com>
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this is the Avid-L2

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