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What Happens in Vegas...
...stays in Vegas! This PC-based editing app is a safe bet with these tips.


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Old April 10th, 2010, 11:50 AM   #1
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Hd->sd

First , I am a totally well experienced Vegas user for years now (since Vegas 4.0).

Working on a masterpiece for german television I again run into its limits (?).

I have very HQ , fine detailed HD Material (XDCAM HD422 & 420) that needs to be converted into SD.
For my normal projects I simply set render as to DV AVI or IMX MXF and render it with "best" settings, "interpolate" in project setting.

I always found horizontal or vertical lines to be very "flickery" as a result of the downscaling. It looks like Vegas does not deinterlace the HD Material properly before resizing.

What is your best HQ approach to this?

If needed, I can provide some raw shots in HD via my server, so you can test it.

Thanks

Uli
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Old April 10th, 2010, 03:38 PM   #2
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Uli,

The problem is not just the deinterlacing; it's the resizing alogarithm itself. Vegas (and most other NLEs) do not use the proper resize alogarithms. They do a poor job at resizing interlaced content.
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Old April 10th, 2010, 04:02 PM   #3
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I edit and render my final AVI using Cineform 1920x1080. I then do my downscaling and MPEG-2 encoding in TMPEG and I'm very happy with the results. TMPEG use Lanzcos-3 downscaling which is supposed to be the best.
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Old April 10th, 2010, 06:05 PM   #4
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Quote:
Originally Posted by Randall Leong View Post
Uli,

The problem is not just the deinterlacing; it's the resizing alogarithm itself. Vegas (and most other NLEs) do not use the proper resize alogarithms. They do a poor job at resizing interlaced content.
And no better with progressive content. You get a much better result with the free AVsynth and VirtualDub. Another thing you might try is adding a one pixel gaussian blur to some scenes before you downsize - the blur is not evident on the downsized version and it could reduce the flickering.
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Old April 11th, 2010, 05:32 AM   #5
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I never used cineform - there are different versions on their website... what package do I need at least ror trying?

Thanks

Uli
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Old April 11th, 2010, 07:50 AM   #6
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Take a look at the Maximizing HD to SD Quality thread as this was discussed at great length with several excellent suggestions.
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Old April 11th, 2010, 04:12 PM   #7
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Quote:
Originally Posted by Uli Mors View Post
I never used cineform - there are different versions on their website... what package do I need at least ror trying?

Thanks

Uli
I'm using Neo HD. This has the added feature of First Light which is real time color correction on a metadata level. Cineform Neo Scene is the more economical way to go but has some limitations. I like to upsample my HDV to full HD and I am not sure if Neo Scene allows that. I know it works fine for AVCHD.

Also I don't think you have to use Cineform to get better DVD files. I would just export in whatever file format you use and try out TMPEG for the downscaling and encoding. There is a Sony Codec included in Vegas which some people seem to prefer to Cineform.

Marc
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