1080i50 Digitising Advice Sought

[Michael Gissing]

[Steve Price] “The problem is that FCP doesn’t have a Capture/Input preset for ProRes Proxy 1080i 50, so I just digitised a couple of clips using ProRes Proxy 1080i 25.”

I have 7.0.3 and Kona3 with vers 8 software. I can capture ProRes Proxy 1080 50i.You should also have an easy Setup for PR Proxy. As all your material is from HDCam, you should capture as 50i.

[Steve Price]

Thank you Michael,

I also have FCP 7 and AJA 8 Software – but there’s no preset for PR Proxy 1080i 50 and no Easy Set Up for it either. I can only get it in 25 and 29.97 .

So it seems the answer to my problem is to work out why I haven’t got that preset.

Thanks for your advice,

Steve.

[Michael Gissing]

AJA call it i25 but it means interlaced 50 fields. I don’t know why AJA sometimes us the frame rate rather than field rate. It is a fairly established convention. Do you have 1080 25i listed in both Easy Setup and Capture codec?

[Steve Price]

Thanks again Michael,

Yes, I have AJA LH 1080i 25 PR Proxy in my presets and that’s what I’ve been using.

The problem I have is with the picture flickering by separating into horizontal lines when there’s movement in the scene, like this…

I need to find out what’s causing this and how to fix it…before I digitise the rest of the 30 hours of footage!

Thanks,

Steve.

[Steve Price]

The lines are actually wider and more pronounced than in this image, I think Photoshop must have done a bit of deinterlacing in the export.

[Bret Williams]

Looks like interlacing to me. What’s the problem? You said you shot interlaced footage. Should look perfectly smooth on a PAL monitor. Are you just judging by a computer screen?

[Steve Price]

Unfortunately those lines are there in the Viewer, and the Canvas, and on my PAL monitor!

Meanwhile, I’m renting a HDW-M2000P HD Cam machine for £250 per day and I can’t use it to ingest all this footage until I fix this problem…

Thanks for your help Bret,

Cheers,

Steve.

[Jeremy Garchow]

That’s interlaced footage as it’s finest. I don’t know what you are expecting? If you need progressive, you should shoot progressive.

Kona card should be set @ 1080i25 and the codec of your choice. I should add your timeline should be set to 25fps, not 50. It’s why AJA calls the setups like they do. If you set the frame rate to 50, it wouldn’t be right.

Jeremy

[Steve Price]

Thanks Jeremy,
I understand 1080i is interlaced at its finest, but you wouldn’t think so if you were looking at my screen…

The pictures are like this in the viewer and in the canvas.
It’s not like it on my external monitor, it plays fine on that.
When I open the clip in QT it’s only like this when I shrink the viewing size, it’s fine when it fills the screen.
Similarly, the lines are very much reduced in FCP when I stretch the viewer to fill the screen.
This problem occurs with all ProRes 1080i 25 codecs. However, if I digitise my footage at 1080i Uncompressed it looks fine in the viewer and everywhere else.

Therefore I’m deducing the problem is caused at the digitising stage of the process. However, I still can’t work out what that problem is!

Thanks for your time, it’s much appreciated.

Steve.

[Rafael Amador]

[Steve Price] “The pictures are like this in the viewer and in the canvas.
It’s not like it on my external monitor, it plays fine on that.”
So as it should happens.
Your external monitor is Interlaced, so perfect to show Interlaced stuff.
Your computer screen is Progressive, so interlaced stuff will look like that.
There is nothing wrong with that footage.
rafael

http://www.nagavideo.com