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Aliasing in downconversion
I use the Movie Studio (home) version of Vegas. It is excellent tool and one reason for its delightful performance is a tremendous flexibility in frame rates and resolutions. However I am so far disapointed with the downconversion capability because of the lack of filtering. I acquire largely in 1080 50p whicg Vegas supports fortunately. When one downconverts this to SD though there is tremendous aliasing because plainly Vegas is using decimation (sub-sampling) rather than properly filtering the original to deliver the lower resolution. I have been unable to find a solution in this forum or others. Has anyone got any ideas?
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4 Replies
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Do you have access to chroma blur in Movie Studio?
Daniel Hughes
Amateur Writer, Director,
Director of Photography
United Kingdom -
Do your project properties match your source video?
What SD formats have you tried rendering to?
What properties are they set to? -
Mike
The one property I cannot match is that the source is 1080 50p. Vegas accepts that but does not support it as a project setting. I can only set 1080 25i or 720 50p. I have tried both.
I was trying to convert to 576 25i but I have also had to downconvert to non-standard formats like 640×360 progressive.
I have tried various settings and rendered the project as interlaced and progressive versions. In all cases Vegas seems not to filter the images but simply decimate them.
I may well be doing something stupid. I was just expecting that if the source was a higher resolution than the rendered output then filtering would automatically be applied. I can see that it is not – at least in the way I have set this up.
Richard Schiller
Working amateur
Panasonic Camcorder 1080p, Nikon SLR with video acquisition 720p, Sony Vegas editing software.
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Richard, have you tried using the Match Media Aspect tool in Project Properties?
It’s in Pro and I think it’s your version too.
Click on it, browse to a folder with 1080 50p footage, click on any one of them and click Open.
It comes back to your Project Properties tab with the video settings now matched to the clip you clicked on.
Save this as a preset for future use.
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