Puzzling downscale issue


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Puzzling downscale issue
by Luc Enders on Jul 5, 2009 at 8:42:41 pm

I noticed a loss of sharpness when I output a project from 1080i to 720p compared to TmpGenc output. See these 1:1 crops:

http://ybapuw.bay.livefilestore.com/y1p0z-AqYOCX33nrqYCKGrcdswiKTxVKr8T1p3O...

I chose best render setting in Sony yet I still see a visible quality loss compared to TmpGenc (same encoding settings WMVHD 2 pass VBR 7/10M).

Any idea if I might have a wrong setting somewhere? I tried both 8 bit and 32bit pixel formats but I saw no difference.

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Re: Puzzling downscale issue
by Steve Rhoden on Jul 5, 2009 at 10:50:44 pm

Don't think you have any setting wrong. If you get
a more pristine output from TmpGenc during a particular
workflow....work with that.

Steve Rhoden
(Cow Leader)
Creative Arts Director and Film Maker.
Project Samples at:
www.youtube.com/hentys

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Re: Puzzling downscale issue
by Luc Enders on Jul 5, 2009 at 11:46:27 pm

Thanks very much. I was hoping I had some obvious bad setting so I could save one rendering step. Right now I do use Vegas for editing since it's really great at that and output as Sony YUV. Then use tmpgenc for final output.

Related to this is that I noticed that when I output my AVCHD files to uncompressed AVI I lose slightly some contrast. But not with Sony YUV. Could that be explained that the uncompressed AVI is RGB and the source is YUV and in that conversion you might lose some quality/contrast?

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