Footage Very Interlaced – Avid MC7

[Shane Ross]

Is the project type 1080i 59.94, or 1080p 29.97?

Shane
Little Frog Post
Read my blog, Little Frog in High Def

[Alan Callaghan]

The project is 720p 59.94
The footage is 1080i 29.97

Should I delete the footage that was transcoded in the 720p project, and create a 1080i 29.97 project and open the edited sequence in there and retranscode ?

Thanks for your time

Alan

[Shane Ross]

TRANSCODING 1080i 29.97 to 720p 59.94 might get you…odd results. Best to AMA link to and transcode the footage in a project that matches the frame rate, and then open into the desired project type. It’ll get you better results, definitely. Not sure it’ll clear up the interlaced look entirely, as you are bringing in an interlaced format. It’s interlaced 30fps…not sure how it’ll react in a 720p60 project. Do a test and see. I’d do one, but I don’t have 1080i footage around.

Shane
Little Frog Post
Read my blog, Little Frog in High Def

[Oliver Peters]

In my experience, footage from a DSLR is not interlaced. It’s usually 1080p, so 29.97 would be with progressive frames. If you are seeing interlaced artifacts, like split-field frames in motion, then somewhere along the line it’s being incorrectly interpreted or it wasn’t a DSLR. What format is the camera footage (H264 MOV, AVC, other)?

You might take a look at how the Avid motion adapters are being applied. In the 720p/59.94 timeline, you should see each frame of the 1080 material repeated for a 2:2 cadence.

So when you say “interlaced” are you actually seeing split-field frames?

– Oliver

Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com

[Alan Callaghan]

Thanks Oliver,

So looking at the raw footage, it is H.264, 1080, 29.97
My guess is it was shot on a DSLR, because it is H.264, but maybe it was converted? The files are not labeled like the would be, if they came off a DSLR. But, again, they could have simply been renamed.

Looking at the RAW files at 100%, I’m not seeing a normal 3:2 cadence when I step frame by frame in Quicktime. When I play the transcoded video full screen (the 720p 59.94 in the project) it exacerbates the problem. Like when people move around in the frame, it looks like horizontal venetian blinds.

So, yea, I is a split field issue I suppose.

Thanks again for taking your time to help.

alan

[Oliver Peters]

[Alan Callaghan] “Looking at the RAW files at 100%, I’m not seeing a normal 3:2 cadence when I step frame by frame in Quicktime. When I play the transcoded video full screen (the 720p 59.94 in the project) it exacerbates the problem. Like when people move around in the frame, it looks like horizontal venetian blinds.”

If these are progressive frames from a DSLR, you should see nothing but whole frames with each step (make sure this is QT7 at full size). There’s no 3:2 involved. If it’s interlaced, then any horizontal pan or fast action within the frame should show visible jaggies on the edges.

Are you using MC to do the size conversion? “Horizontal venetian blinds” sounds like a sizing problem. Make sure you imported the 1080 footage into a 1080p/29.97 MC project. Look at it there to see if it’s OK. Then open that bin into your 720p project. DO NOT bring the footage directly into the 720p project.

– Oliver

Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com

[Alan Callaghan]

Thank you Oliver,

I think that’s the issue. I was looking at the 1080 stuff at 100%, and it looks like those venetian blinds are there (very subtlety), and I’m guessing when the footage was resized in Avid, it made it worse.

I made a 29.97 1080p project, and ama linked the raw footage, and the blinds don’t look as bad.

Should I delete the 720p footage, open the edited sequence in the 1080p project, and ama link/transcode/relink the clips to improve the picture?

thanks again for your help!

alan

[Oliver Peters]

[Alan Callaghan] “Should I delete the 720p footage, open the edited sequence in the 1080p project, and ama link/transcode/relink the clips to improve the picture?”

I’m not sure that working from something you’ve already edited will make it better. You might have to start from scratch, by importing the camera files into a 1080 project first. Relinking might work, but I don’t trust Avid for anything requiring relinking unless the parameters are very tight.

– Oliver

Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com

[Alan Callaghan]

Gotcha,

thanks for the advice.

All the best,

Alan

[Stacy Lincoln]

Hi! Use the instructions here…and this may very well help you!
It has worked for me!

The Timewarp motion effect (adjusted with the Motion Effect Editor) can be used to deinterlace with the following settings:
• Type: Both Fields
• Source: Interlaced
• Check Adaptive Deinterlace Source
• Output: Progressive

I have a screen shot of this if needed. Feel free to contact me at
stacy.lincoln@coxmedia.com

Source: https://community.avid.com/forums/p/99392/572313.aspx