NOISY movies... What about it?

[HarryM]

Hi,

today I make the copy of movie 'The deer hunter' (3 hours playtime).

I have problem.

First part of this movie is decent noisy and second part of movie is strongly, granularly noisy (spacial or temporal filters are powerless :-(.
I test 1st pass (640x272 px cropped, h263 quant) and compressibility is 36% (2x700MB).
Its too little (I know), I so use 3 CD well...

But when I use 'modulated' quant and AltCC, codec take too much bitrate from first part with decent noisy (and devalues it) and get this lot of bitrate to second, noised pass...
Hmmm. But I want (contrariwise) reduce bitrate in noised part (in order to reduce of noise)...

What to do about it?


Question1: Is correct using of 'mudulated' quant at noisy videos???
Question2: Is correct for noisy videos compressibility at 60% or better get lower (lower quant)?

Thanks

[Vash]

Hi HarryM.

@Question1: Especially with noisy sources, I prefered H.236 which softens the movie a little. The a noisy movie treated with MPEG quantization, which takes more bits and sharpens the picture, as I understood, will have more noise.

@Question2:In my cases, a lower quantizer gave better results with noisy movies.

Anyhow: did you consider encoding both parts seperately? The first one with temporal smoothers and the second one using spatial softening filters, maybe like "smart smoother" by Donald Graft, or even more powerful noise reduction filters, used mainly for TV-Rips? This could very well lead to an unpleasant change in crispness,changing between both parts, but might suit better to your source.
Just an idea...

In case I´m wrong: Anyone: Please correct me!:)

[HarryM]

Thanks too. I have same experiences...

Perfect, clean movie: compresibility 55-60%, 'modulated' quant
Noisy movie: compressibility 40-50%, 'h263' quant