[x265] A few questions about the new VUI settings

[Selur]

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Got a bunch of questions and uncertainties about the new VUI settings,
would be nice if someone could explain a bit what they are ment for.

> --vui                         Add Video Useability Information with
>  all fields to the SPS. Default disabled

Does this have to be set for all the other options to work, if not what
does it do?


> --sar <int:int|int>           Sample Aspect Ratio, the ratio of
> width to height of an individual pixel. Choose from 0=undef, 
> 1=1:1("square"), 2=12:11, 3=10:11, 4=16:11, 5=40:33, 6=24:11, 
> 7=20:11, 8=32:11, 9=80:33, 10=18:11, 11=15:11, 12=64:33, 13=160:99,
>  14=4:3, 15=3:2, 16=2:1 or custom ratio of <int:int>. Default 0

Is there a difference in I use --sar 1:1 or --sar 1 ?

> --overscan <string>           Specify crop overscan setting from 
> undef, show or crop. Default undef

I suspect this requires '--crop-rect <string>' to be set and decides
what to do with the crop values.
assuming the decoder supports it:
show = should just 'overlay/show' the crop rectangle
crop = should actually crop the output picture
but what does 'undef' in this context mean? Does it mean that the
decoder decides what to do with the crop rectangle values, does is mean
'ignore' the crop rectangle values or what is it ment to do?

> --[no-]fieldseq ... --nal-hrd .. --subpichrd ..

I suspect that these might be needed for some future blu-ray/avc-hd
compatibility?

> --timinginfo                  Add timing information to the VUI. 
> Defaut disabled

No sure what this is for since I doubt that it is the same as the time
codes one normally finds in containers.

> --bitstreamrestriction        Add bit stream restriction fields to
>  the VUI. Default disabled

I suspect that this is needed for later tier, profile, level signaling?



=> got a lot of ideas what stuff might be, but some additional infos
would be nice (and it might be a good idea to add these to the next
'x265 Evaluators Guide').


Cu Selur
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