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Unofficial VirtualDub Support Forums > Advanced Video Processing > Divx5/xvid Setting For Poor Q-ty Input?

Posted by: junglemike Dec 26 2002, 12:25 PM

Hi there, I sometomes compress with xvid/divx5 downloaded mpeg clips that has poor quality , or just very old videos,like Tom&Jerry (1940+).
As far as i understand, the default 2-pass processing settings for divx and xvid are set to be best with high-quality input, like dvd-ripping. But does anybody know is there some better settings for low quality input, that work better than default?

Posted by: jcsston Dec 26 2002, 10:49 PM

When compressing noisy or older video sources, I apply filtering to improve the video. With Divx or other codecs, I just use a higher bitrate

Posted by: dnelson Dec 29 2002, 04:45 AM

I never use the builtin divx filters; you can't tell what they actually do without doing a full encode.

For noisy/staticy videos, the Virtualdub Smoother filter with the noise prefilter checked can do wonders. For cartoons/anime, there are custom filters like Smart Smoother that try to preserve sharp lines and balance out large color areas. I like the General Convolution 3d filter, too, which lets you blend not only physically but temporally adjacent pixels. This probably would cause too much ghosting in cartoons, though.

I always finish with the temporal smoother filter, at level 2 or 4, depending on the original quality.

Posted by: jcsston Dec 29 2002, 05:02 AM

the DivX pre-processing filters IMOHO are very limited
Slight, Normal, Strong, and Extreme wow look at all the settings

I use 'Smart Smoother HQ' by Klaus Post and the 'temporal smoother' with a little sharpening at the end, 'sharpen' or 'msharpen'.

A question, which is 'better' a Spatial noise filter and then Temporal noise filter, or a Temporal noise filter and then a Spatial noise filter?

Posted by: junglemike Jan 1 2003, 08:04 PM

Thanks for replies. I tried some of filters mentioned above. In some cases it really helps

Posted by: jcsston Jan 2 2003, 12:44 AM

QUOTE (dnelson @ Dec 28 2002, 10:45 PM)

I like the General Convolution 3d filter, too, which lets you blend not only physically but temporally adjacent pixels. This probably would cause too much ghosting in cartoons, though.

I my experience cartoons can take more noise reduction without ghosting. Ex. 'Dynamic Noise Reduction 2.1' by Seven Don/Avery Lee with a setting of 12 - 21 worked great on cartoons, but when I tried it on real people their faces streaked and lost detail

that is why I switched to the Temporal Cleaner.