Frameserving concepts for the newbie

[KenJ57]

MrMoody -- you have figured it out! Except I don't understand what happened yet! Here is my script:

AVISource("D:\Adobe\PrEl\Capture\PowerTalkPSA.avi") 
LanczosResize(640,480)
#ConvertToYUY2(interlaced=true)
#SeparateFields() 
#odd=SelectOdd.Convolution3D (0, 6, 10, 6, 8, 2.8, 0) 
#evn=SelectEven.Convolution3D (0, 6, 10, 6, 8, 2.8, 0) 
#Interleave(odd,evn) 
#Weave()

When I compare frame-for-frame as previously displayed, the size is precisely the same. But your previous message hinted that the there may be a slight quality loss. I don't yet understand how my aspect can be restored to what is was using (640x480). Has there been a double aspect resize? And is it acceptable?

I then removed the comments from the rest of my script and the image now plays fine. The noise reduction at these settings is minimal, but I can now experiment.

I didn't realize this lesson would be so hard! I appreciate your expertice. Thanks. -- Ken

[MrMoody]

I can't explain any better than I did without writing a whole book. Go research "aspect ratios." The concept can be very confusing when dealing with pixel aspect ratio vs. picture aspect ratio.

The simple fact is that Premiere Elements badly assumes that frameserved 720x480 is 1.5:1 aspect ratio, and then undesirably shrinks and adds black bars to fit in 4:3. By changing to 640x480 we are making it correctly assume a 4:3 picture.

The resize should come after the noise filtering for maximum filter effectiveness. Move the resize to the end of the script.

And yes, there are now two resizes, to 640 in AviSynth and most likely back to 720 in Premiere (I'm assuming it still outputs 720x480). That's why it would be better to set Premiere to recognize the 4:3 if possible.

[KenJ57]

Thank you MrMoody, and all who have contributed here. I have enjoyed this discussion very much -- Ken

[jimmalenko]

To go from one extreme to the other with your convolution3D settings, try the settings listed in the readme.txt file that came with it. There's a few heavy settings in there, that may or may not smooth the video too much.

[KenJ57]

Thanks. I have been reading it. I tried "vhsBQ" but get an error with AVISynth v2.55. The numeric settings work fine, though.

[jimmalenko]

Yeah, I have the same. The presets by name don't work, but I can just use their numerical equivalents. Dunno why