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UpRes losing frames?

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Michael Moser
UpRes losing frames?
on May 9, 2010 at 4:45:56 pm

I've sometimes noticed when I'm upresing on record from a Betacam (D600) component input to 720 record that the file seems to be losing some continuous motion.

If someone moves quickly or the camera moves, there is sometimes a little jump. Is this an artifact I have to live with or is it a problem that can be corrected?
I have to upres the file so that I can provide the client a 16x9 file from a 4x3 camera.

Standard Def on the KiPro does not record in 16x9 configuration from a 4x3 camera.

Any advice on this would be helpful.
Thanks.
Michael Moser



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Marc Colemont
Re: UpRes losing frames?
on May 9, 2010 at 8:05:22 pm

What you might have seen is the video judder as the 50 or 60 interlaced frames are deinterlaced to 25 or 30 progressive frames?
And no the AJA Ki Pro does not loose frames


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Michael Moser
Re: UpRes losing frames?
on May 9, 2010 at 8:51:33 pm

That was what I was thinking, but is 720/59.94, by definition, progressive?
The input is definitely interlaced, but this may be the problem...



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Marc Colemont
Re: UpRes losing frames?
on May 9, 2010 at 9:02:13 pm

As NTSC footage becomes 30P after deinterlace, the recorded signal could be recorded with double frames if the file is 60P. I have seen files like that before.
If you have a sample, and load it into an NLE, you could verify.


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Michael Moser
Re: UpRes losing frames?
on May 9, 2010 at 10:05:27 pm

I think what I'm seeing is the difference between 29.97 and 59.94. As an original SD signal there has to be an up-conversion and this is an artifact of that. Sometimes it's visible and sometimes it's not. Some people call it a feature, some a defect....



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Marc Colemont
Re: UpRes losing frames?
on May 10, 2010 at 8:36:07 am

It's the nature of progressive footage when seen on 24, 25 or 30 frames.
Just like in Cinema one has to take care of panning the camera. Either slow or very fast.
Pan movements in between are not pleasant for the viewer. As they see the so-called 'video judder' of the background. In cinema is less visible as the DOF is set that the background is mostly out of focus.


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Alex Desrial
Re: UpRes losing frames?
on May 10, 2010 at 1:48:47 pm

Hi Marc,

I expererience the same way with you. But i did in the contrary where i down convert 720p50 from P2HD to SD PAL in KiPro. At least we do the same thing, doing convert progressive to interlace ( or vise versa) and targeting different frame size.

I found motion artifact only on the LCD computer display, but not applied to all clips, as some other clips are OK. But if i play back the clip with high definition broad cast monitor or with SD CRT broadcast monitor, the clips are just fine.

Try this, play back the clip directly from KiPro to HD brod cast monitor.







Alex Desrial
MediaIntegra - Jakarta


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Marc Colemont
Re: UpRes losing frames?
on May 10, 2010 at 2:44:53 pm

A LCD monitor cannot display interlaced signal like a CRT.
It will always show complete frames, therefore it is more visible indeed.


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Marc Colemont
Re: UpRes losing frames?
on May 11, 2010 at 8:47:18 pm

I did a test with 1080i25 in and Convert and record to 720P50.
Looking frame by frame, the 720P50 file contains double frames as expected.
As it takes the two fields to de-interlace.
The de-interlaced footage looks awesome by the way.


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