On 02/27/2014 11:38 PM, Selur wrote:
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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?
No, it doesn't. All it does is set all flags that cause the vui and
optional parts of it to be added to the sps. Without specifying any
other vui cli options, the vui will only have default values. I added
this initially only for testing purposes but thought it might be useful
beyond that. If not, then it can be removed. Just specifying any vui
cli option by itself will cause a vui to be added to the sps.
--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 ?
No they will both cause the same result of apsectRatioIdc being set to 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?
Initially, I left out the undef option but since it's part of the x264
--overscan cli option I added it. The undef option means that overscan
info is not included in the vui which is the default anyway so it really
does nothing. The decoder decides nothing.
--[no-]fieldseq ... --nal-hrd .. --subpichrd ..
I suspect that these might be needed for some future blu-ray/avc-hd
compatibility?
I am not sure. I am new to x265 and haven't worked on x264 but I am
sure there are others that can answer this for you.
--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.
It's timing information in relation to the display of frames and general
system clock information in units of ticks.
--bitstreamrestriction Add bit stream restriction fields to
the VUI. Default disabled
I suspect that this is needed for later tier, profile, level signaling?
Probably. Like I said, I am new to this and others may have a better
answer.
=> 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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