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Extract frame from monitor

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sleepless
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Extract frame from monitor

Fri Aug 19, 2011 8:22 am
Extracted frames from monitor look either extracted from proxy or interlaced material. How can I tell kdenlive to extract the picture from deinterlaced source material?

Thanks in advance for your response.
Rinus
normcross
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Re: Extract frame from monitor

Sat Aug 20, 2011 11:14 am
I assume from what you say you do have proxy clips enabled. If so, just go the the Project Tree and right click on the clip and un-check the proxy. Extract frame should now work on the original clip. Then you can just re-enable the proxy.
sleepless
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Re: Extract frame from monitor

Sat Aug 20, 2011 4:48 pm
Thanks for your response normcross.
However, your solution does not work because that is how I got my interlaced (combed) pictures. For now I have to reencode my entire footage to non interlaced material, load it as a new project and extract my pictures from that. Alas that is the hard way and very time consuming. I hope someone has an idea how to do it in a more easy way.

Regards,
Rinus
moorsey
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Re: Extract frame from monitor

Thu Sep 15, 2011 6:10 pm
I have also just been doing the very same thing. It was apparently fixed in this bug report:

http://www.kdenlive.org/mantis/view.php?id=2096

But I can confirm that using "Extract Frame" on proxy material does not use the source footage.

Also, when I dis-abled proxy, the frame was different in the same place as when the proxy was on. This makes it pretty impossible to extract the correct frame and use it in the project
yellow_drupal
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Re: Extract frame from monitor

Thu Sep 15, 2011 7:14 pm
I've fallen foul of extracting frames from the monitor, the quality is not high, nothing to do with proxies more to do with basic conversion to RGB image formats, the monitor view is more aimed at playback than image quality. Better to find alternative way to extract images if quality is a concern.

Unless things have changed.
moorsey
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Re: Extract frame from monitor

Fri Sep 16, 2011 9:13 am
I think proxies are involved here. I get 2 different images, with proxies and and proxies off. The one with proxies off is interlaced, as per source video, so that is to be expected I suppose. Can't explain the frame difference between proxies and source though. That is potentially a more major issue here
yellow_drupal
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Re: Extract frame from monitor

Fri Sep 16, 2011 9:25 pm
moorsey, sorry wasn't suggesting proxies weren't the problem in this case, rereading my post makes it sound like it, what I meant was that even when we extract a frame without proxies the quality is still lower than 'other' methods.
moorsey
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Re: Extract frame from monitor

Sat Sep 17, 2011 8:38 am
ah, apologies for the mus-understanding, got you now!
normcross
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Re: Extract frame from monitor

Sat Sep 17, 2011 5:12 pm
Been doing some testing on this.

first - 1920x1080 25fps mp4

Extract from Clip monitor Proxy off = correct image - good quality
Extract from Project monitor Proxy off = correct image - good quality
Extract from Clip monitor Proxy on = correct image - good quality
Extract from Project monitor Proxy on = correct image - Proxy quality

second - raw MTS 1080 50i (25fps)

Extract from Clip monitor Proxy off = wrong image - good quality
Extract from Project monitor Proxy off = wrong image - good quality
Extract from Clip monitor Proxy on = wrong image - good quality
Extract from Project monitor Proxy on = correct image - Proxy quality

With the MTS clips, what I'm seeing on the Monitors' is two frames behind the extracted images.

I just checked. If I moved the clip monitor back two frames and extract, the saved image is the one I wanted (in good quality).


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