question about 848x480 res

jethropr · Post by **jethropr** » Thu Mar 27, 2008 1:44 pm

What's with the hardon everyone seems to be getting over this res lately?

JaddziaDax · Post by **JaddziaDax** » Thu Mar 27, 2008 1:50 pm

i donno lemmings? monkeys?

its like "HD!" zomgness O:

Zarxrax · Post by **Zarxrax** » Thu Mar 27, 2008 6:52 pm

Well I don't think it's anything new... people have been using it for as long as dvds have been around.
Maybe it's just more common now that more anime are widescreen.
If you are using mp4 container though, it's pretty dumb to do 848x480, since you can just keep it 720x480 like the dvd and then set the PAR flags to resize it.

jethropr · Post by **jethropr** » Sun Mar 30, 2008 12:53 am

but why use 848? why not use what's closer to 16:9, 854.

Seems kinda random to use 848

Kariudo · Post by **Kariudo** » Sun Mar 30, 2008 1:27 am

because 848x480 is essentially 16:9 (1:1 square pixels) and is mod16 (important for some codecs)

854x480 is not mod16

Zarxrax · Post by **Zarxrax** » Sun Mar 30, 2008 11:44 am

Yes, it's important to be mod16 to compress efficiently.

Zarxrax · Post by **Zarxrax** » Sun Mar 30, 2008 12:06 pm

Just did a test with one of my AMVs using xvid at constant quantizer.

848x480: 321MB
854x480: Not possible to encode, must at least be mod4.
856x480: 324MB
864x480: 324MB

But its not just efficiency, some poorly designed decoders have been known to have playback problems with material that is not mod16.

Ryko89 · Post by **Ryko89** » Sun Mar 30, 2008 12:51 pm

mod16?

And I thought we just used it 'cause it sounded much hotter.