Interlacing issues in Quicktime Playback, but not in an edit environmnet, what is this.

[Jim Fink]

Greetings Brain Trust:

SO, I've been plagued by this for a while, and so I took some time to document some screen captures, to illustrate what I am seeing.

Working in Premiere. Importing a 29.97Fps MPEG2 Broadcast master spot that has obviously been converted from 23.97 or 24 to 29.97, and then keeping it at 29.97 and re-exporting it.
When I look at the source file on an iMac with Quicktime player v 10.4 I see an "echo" interlacing looking frame offset on the frames that were originally repeated to convert from 24 to 29.97.

Looking at the same frame in the edit timeline, it's fine, just a repeated still frame, smooth, no double edges etc.
When I export from Premiere as a 29.97 ProRes, looking at the encoded output back on the iMac in Quicktime, I still see the same echo, interlacing like looking artifact on the same frames
I tried also turning on Frame Blend for output, no difference.
If I re-import that same encoded output clip back into the 29.97 timeline, it still looks fine.

what is this.. is it a quicktime player issue..
is Premiere, correcting this.. ? what is the real look.

Thanks, to anyone who knows this signal path better than moi.

Attached a still that illustrates the above 5 steps. !
--------------------------------------------------------

Also, what is this MPEG2 Broadcast format, I keep seeing. Do the master control hardware encoders, run this MPEG2 format, it's not a format that shows up in  Adobe Suite's Media Encoder.
It has an interesting phenomenon of making a repeated frame before a cut much lower res than the frame before it. Is that a way to reduce file sizes where it is least likely to be noticed.


Thanks
Jim Fink
DS Ex Pat

[Jef Huey]

Probably the way you have Premiere set up.

First, you need to make sure what the sequence setting is in P - interlaced or progressive.  Second, how are you looking at it?  P lets you decide to view field 1 or field 2 or both in an interlace project.

Those are the things I would look at first.

Jef

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Jef Huey

Senior Editor   |  Henninger Media Services

Arlington, VA  |  703-243-3444

 

Take a look at my work.
http://vimeo.com/album/3037796

[Mike Dziennik]

View it in QuickTime 7 (you'll prob have to download it) and you can toggle Deinterlacing on and off. QuickTime 10 (x) automatically deinterlaces I believe and I don't think you can switch it off. 

[M-Edit]

Maybe somewhere in here will help you investigate...

https://helpx.adobe.com/premiere-pro/using/interlacing-field-order.html

And my guess is also that you are looking at just ONE field in Premiere.

//Mike-E