[FFmpeg-devel] [PATCH] avformat/mxfenc: Add color siting element

[tim nicholson]

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On 21/05/15 11:47, Michael Niedermayer wrote:
> On Thu, May 21, 2015 at 08:20:48AM +0100, tim nicholson wrote:
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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 en
um
>> :
>>>>>  *  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 does
n'
>> t
>>>> click. I do no see how you can represent "co-siting" in ascii art w
it
>> h a
>>>> single character and the "3" position certainly doesn't do it for m
e!
>>>
>>> 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.
> 
> Ive tried to improve the text and ASCII even more
> does it make sense now ?
> 

Still don't understand why two colour sample sites per pixel.

Please don't waste any more time fiddling with this, I expect it will
suddenly click in my brain when I least expect it. Oh hang on I think it
just did, you superimpose the second art on top of the first so the 3 is
on top of the X but the 4 is between them etc etc....

In which case I think I agree with your mappings, sorry its taken so lon
g ;(

> [...]
> 
> 
> 
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- -- 
Tim.
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