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Re: new compression formula needed

On Aug 18, 2005, at 7:57 PM, Ben Waggoner wrote: 
Gianni,

Algosuite is incredible - I've been bugging all the compression tool vendors to look at doing some kind of plugin license deal with Algolith. Much as I like After Effects, it's overkill to do all my preprocessing in.

While noise-reduction is certainly an important feature for compression, our customers are
asking for less processing at the compression stage, not more. Taken to the extreme, if you
look at the Superbit version of 'The Fifth Element' DVD, the compressionist has gone to great
lengths in fact, to preserve the patterns of noise originating in the grain structure of the film stock.
They employed quantization matrices which are very low Q and the overall compression in
the film is very low.

Personally, my suggestion is to employ noise reduction, in whatever form, to the source material
before it is dropped into the editing timeline, before it is cut, before motion graphics are superimposed,
etc. Temporal noise reduction, even if it is done using very small blocks for optical flow, introduces
its own peculiar artifacts into the video. I mean, why would anyone want their perfectly clean
and noiseless CG titles and motion graphics material subject to a temporal averaging filter?
It's not like the motion compensator in the noise reduction can handle rotational movement
and translucency, so it's obvious that noise reduction is appropirate earlier on in the production pipeline.

Only the conversion of archival material stored on older noisier formats really requires
motion compensated noise reduction like catsup over the entire length of the program.

Preprocessing is an area of production in it's own right, distinct and separate from video compression.

Ben Waggoner, Interframe Media http:// www.interframemedia.com
Technology and Strategy for Digital Media

My Book: http://www.cmpbooks.com/compression/
My Tutorials http://www.classondemand.net/benwaggoner/
My Stanford Class http://www.digitalmediaacademy.org/ compression.html

On Aug 18, 2005, at 4:16 PM, Gianni Maselli wrote:


Hello, this is my very first post after many years (unsubsribed for a lot)

Afaik Sorenson standard defaults to frame dropping "on" .
If your video is noisy and/or has lot of motion it's possible the codec
drops frames to mantain the datarate. If I were you I'd try to use a good 3D
denoiser. Unfortunately on the Mac I don' think there are any free or open
source solution (as it is for the plethora of Avisynth plugins on
Windows...). You might want to buy a weekly license of Algosuite by
Algolith. It's $59



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References: 
 >new compression formula needed (From: "Craig Taylor" <email@hidden>)
 >Re: new compression formula needed (From: "Gianni Maselli" <email@hidden>)
 >Re: new compression formula needed (From: Ben Waggoner <email@hidden>)



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