1080 Bulary Rips sometimes grainy

[leopardx]

I have been watching some 1080p Bluray rips in MKV format (not my rips) and notice that some of them, despite their large size (up to 15 GB and 10-ish Mps bitrate) are kinda grainy or more pixelated than others.

Are some of these movies supposed to be like that or does it mean low quality? Why the pixelation in some movies?

Don't get me wrong...they don't look bad at all...just wondering why the pixelation is some and not others?

[Supreme2k]

Couple of things:

1. You are talking about encodes, not rips. Rips are 1-to-1, no quality loss.

2. Rip and encode your own material, then you don't have to wonder why someone did a shitty encode with such a large filesize. You'll always be subject to the knowledge/skill level (or lack thereof0 of the torrenters. I've gotten some pretty damn excellent quality encodes at 4-6GB sizes.

[Baldrick]

Buy/rent the blu-ray and compare.

Grainy is normal but it should't be pixelated.

[FulciLives]

I think a lot of what you are seeing boils down to the type of film stock that was used and the age of the film also plays a role.

For instance I saw a 720p rip of the UK Blue-Ray release of George A. Romero's NIGHT OF THE LIVING DEAD (1968) and although the resolution looked sharp (my computer monitor is 1280x1024 which is perfect for 720p) there was a massive amount of film grain and this is due to the film stock used by this movie.

Some films (especially newer movies) will look more "slick" and lack film grain whereas some film (especially older movies) will have film grain present.

- John "FulciLives" Coleman

[poisondeathray]

Are you talking about film grain, or macroblocks/pixellation? Film grain is usually a wanted characteristic, pixellation is not

1) Sometimes, whoever encoded it didn't do it properly e.g. faulty decoder for the source file, and this will be a faulty stream - nothing you can do about it if this is the case

2) Sometimes, swapping containers will help e.g. use .m2ts or .mkv or .ts will get rid of the pixellation if the underlying stream is not corrupted

[leopardx]

Thanks for all the responses.

I guess I mean grainy, not pixelated. There are not blocks of pixels, just "fine grains".

So then this is normal in some movies? Cool. Thanks. I was affraid I was getting too picky.

[raffie]

Yes, SD resolution is too low to make film grain visible, but in HiDef it becomes apparent depending on the film!

In the film 'Forbidden Planet' from 1956, watching in 1080p you can very clearly tell (close up) whenever optical effects where used, because the entire image is blurier than in other scenes. This is because for optical effects the film was copied -probably multiple times-. Never would I have noticed this in DVD resolution.