Is 912x512 considered as 16:9 aspect?

[fshahid]

Hi everyone, this is my first post here :)

Well straight to the question, i have seen videos around net resolutions like 1024x576 (576p), 848x480 (480p) etc, what you have to say about 912x512 (512p), can it be considered as standard 16:9 or is it not actually 16:9 and non-standard resolution?

[Flux]

912/512 ~ 1.78 while 16:9 is 1.77...so it is close enough. Pretty much every 16:9 video has a bit wider than 16:9 aspect ratio. It really doesn't matter much. Usually smaller resolutions are used to reduce filesize while preserving certain level of video compression quality. Strict resolutions are mostly for stand-alone players which have limited scaling and video format structure.

Although I would always use only certain 16:9 resolutions like 640x360, 960x540, 1280x720, 1920x1080 because it might help a bit with scaling quality when numbers are divided nicely. For example 960x540 is half from 1920x1080 and 640x360 is 1/3 from 1920x1080

When thinking this way, 912x512 is not standard resolution because it doesn't work everywhere.

[BigDid]

Hi and welcome to the forum,

1/ 1024 is mod 32
576 is mod 32
so 1024x576 (1.778 AR) is divisible by 32 and /2 below

2/ 912 is mod 16 only
512 is mod 32
so 912x512 (1.781 AR) is divisible only by 16 and /2 below

3/ For comparison
960 is mod 32
540 is mod 4 only
so 960x540 (1.778 AR) is divisible only by 4 and /2

Greater the mod, easier is it to be processed ( by avisynth filters for example)
For common or standards resolutions see:
http://en.wikipedia.org/wiki/List_of_common_resolutions
or
http://en.wikipedia.org/wiki/Display_resolution

Did

[fshahid]

Thank you so much, finally got a technical reply :rolleyes:

So that means 848x480 also falls in same category as 912x512 since they both not in common resolutions and also not divisible by 32

Thanks for the info both of you i was really waiting to know the technical answers to answer that :thanks:

Take care everyone, laters :)

[bcn_246]

Not sure if it matters much, but for XviD/x264 encodes the 'standard' resolutions around the size you have mentioned seem to be 960x544 and 848x480 (the latter is used mainly for NTSC DVD up-scales).
- Ben