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interlaced video bad resizing, what to do?
Hi!
I have some AVI files of which I would like to crop the borders, but after doing that Vegas cannot handle proper resizing and swift movements start to look wavy. Only kinda working solution recommended for me was to mask the borders.
But why Vegas Pro 11 cannot do proper resizing of interlaced material?
I’ll add a clip, you can try yourself.
Btw. Some other said that this is caused by unbalanced signal while capturing the tape, this is from an old VHS tape, and using a timebase corrector would fix that. Could that be the issue also or this is not under question?
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9 Replies
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[Jaanus Henno] “But why Vegas Pro 11 cannot do proper resizing of interlaced material?”
Probably because you have your project set up incorrectly. What are your project properties? (which preset are you using?)
What is your Deinterlace Method set to?
~jr
http://www.johnrofrano.com
http://www.vasst.com -
No, I don’t think so. I don’t want to deinterlace, so I’m keeping interlaced as the source material, lower field first. It will be a dvd so I would prefer interlaced. I also checked render template to make it sure that it’s set to interlaced.
Actually deinterlacing will fix that, but there should be no such error at all.
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What is your Deinterlace Method set to in your project properties?
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Deinterlace method: none
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[Jaanus Henno] “Deinterlace method: none”
That’s your problem. If you are using interlaced video, you must set your Deinterlace method to either Blend Fields (which is the default) or Interpolate Fields (which will sacrifice vertical resolution so it should only be used to fix might motion interlace problems)
You should never, ever, never set your Deinterlace Method to NONE if you are using interlaced video or else it will cause nasty problems like the one your seeing.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Yes, that solved the problem. Thanks John!
But I don’t get it. Why should I use deinterlace method, if I’m not deinterlacing? And then what is the use of the funcion NONE, if that should not be used? I always worked in progressive mode and there I also don’t use None since I have to deinterlace somehow or other.
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[Jaanus Henno] “Why should I use deinterlace method, if I’m not deinterlacing? “
Because Vegas might need to deinterlace your video to process it properly. For example, if you resize your video with Pan/Crop, Vegas cannot simply resize interlaced video because the fields would be enlarged and no longer fit into one scan line. It must first deinterlace the video, resize it, then re-interlace it. It does this without you having to worry about it. So this setting does not tell Vegas that you want to deinterlace, it tells Vegas “if you have to deinterlace to process the video, this is the method to use”.
[Jaanus Henno] “And then what is the use of the funcion NONE, if that should not be used?”
You would only use NONE if you had a 3rd party deinterlacer (like BCC Deinterlace from Boris FX) and you wanted to be in complete control so you tell Vegas not to deinterlace but then you need to add your own deinterlace plug-in to all of your video so that it gets treated properly. You also need to be careful to set up your plug-in chains correctly so that the deinterlace plug-in gets called before Pal/Crop. That’s why I say you would never use it but in reality, you would set it to NONE if you wanted to use a 3rd party deinterlace plug-in (which is extremely rare).
[Jaanus Henno] ” I always worked in progressive mode and there I also don’t use None since I have to deinterlace somehow or other.”
If you had a progressive project, with all progressive footage, then it doesn’t mater what you set it to because Vegas would never have a need to deinterlace the video during processing. It’s only for the times when Vegas needs to internally deinterlace the video in order to process it properly.
So to be more exact:
If you have interlaced footage in your project, you must either:
(1) Set the Deinterlace Method to Blend Fields or Interpolate Fields
– or –
(2) Set the Deinterlace Method to None and use a 3rd party Deinterlace plug-in that you purchased separately and must use on every interlaced clip in your project.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Wow, thanks, that really makes it clear. Now I understand why interlaced video into interlaced takes more time to render than interlaced material into progressive. I often use pan/crop and didn’t know about the internal processing.
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Yea, this is a very misunderstood parameter in Vegas and most people using interlaced video set it to none because they think that Vegas will deinterlace their video if they don’t but that’s not what it’s for at all. I’m glad I could help with your understanding.
~jr
http://www.johnrofrano.com
http://www.vasst.com
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