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Old 29th March 2011, 03:08   #1  |  Link
dreamlayers
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Join Date: Feb 2010
Location: Canada
Posts: 2
Is deinterlacing, denoising and other processing really necessary before encoding?

I've been capturing video from a Video8 source to interlaced MBAFF H.264. I see some people process video before encoding but I haven't really seen advantages from that.

Deinterlacing to 29.97 fps progressive makes motion less fluid and is a compromise between blur and interlacing artifacts. I don't like the idea of permanently putting this degradation into the video. Deinterlacing to 59.94 fps progressive produces a better result but greatly inflates file size. Windows 7 plays interlaced H.264 pretty well, and ffdshow-tryouts with Yadif deinterlacing plays it extremely well.

Some people seem to focus a lot on denoising, but there again I don't see much point. Yes, I can see some slight noise, and it's quite noticeable when manually stepping from field to field. However, the x264 encoder seems to remove most of it. Denoising tends to ruin subtle noise-like textures, like distant grass, road asphalt and slightly dirty walls. At the same x264 CRF, there's a slight decrease in file size, but encoder artifacts become more visible when subtle textures are smoothed.

The only processing I'm doing is a bit of cropping to remove the blackness at the edges and the head switching at the very bottom.
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deinterlacing, denoising, interlaced, video8, x264

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