[FFmpeg-devel] [PATCH] avformat/mxfenc: Add color siting element
tim nicholson
nichot20 at yahoo.com
Thu May 21 09:20:48 CEST 2015
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On 19/05/15 16:50, Michael Niedermayer wrote:
> On Tue, May 19, 2015 at 03:35:42PM +0100, tim nicholson wrote:
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>> On 19/05/15 14:11, Michael Niedermayer wrote:
>>> On Tue, May 19, 2015 at 12:07:24PM +0100, tim nicholson wrote:
>>>> On 19/05/15 01:33, Michael Niedermayer wrote:
>>>>> [...]
>>> the avchroma locations are explained by the ascii art above the enum
:
>>> * X X 3 4 X X are luma samples,
>>> * 1 2 1-6 are possible chroma positions
>>> * X X 5 6 X 0 is undefined/unknown position
>>>
>>> and from this the english directions are exactly where the chroma
>>> samples are located, this also matches how H264 defines chroma
>>> locations.
>>
>> I cannot get the ascii art to make sense to me at all, it just doesn'
t
>> click. I do no see how you can represent "co-siting" in ascii art wit
h a
>> single character and the "3" position certainly doesn't do it for me!
>
> ascii art improved
> does it make sense now ?
>
Better, but I still cannot see the difference between say 3 and 4, or 1
and 2.
> [...]
My understanding of S377 using 2/3 ascii chars/pixel is:-
00h:-
YC Y- YC -Y-
YC Y- YC -Y-
YC Y- YC -Y-
01h:-
Y- C- Y- C- Y-
Y- C- Y- C- Y-
Y- C- Y- C- Y-
03h:-
Y- Y-
- -- C- --
Y- Y-
05h:-
YCr Y- YCr
YCb Y- YCb
YCr Y- YCr
06h:-
Y- Y- Y- Y-
C- C- C- C-
Y- Y- Y- Y-
Not all samples are retained dependening upon the subsampling scheme.
- --
Tim.
Key Fingerprint 38CF DB09 3ED0 F607 8B67 6CED 0C0B FC44 8B0B FC83
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