[FFmpeg-devel] Prores 4444 (alpha) support

[Al Crate]

On 23/10/12 11:53, Maxim wrote:
> Am 23.10.2012 10:38, schrieb Al Crate:
>> Yeah that'd be handy, though getting the color model added to avutil
>> would need to happen first, though just to confuse matters i think
>> 4444 can use RGB as well as YUV
>
> If you could send us a patch it'd be very appreciated!
>
> Hint: please don't top-post on this ML...
>
> Best regards
> Maxim
>
>>
>> On 22/10/12 18:36, Maxim wrote:
>>> Am 22.10.2012 18:20, schrieb Edward Richards:
>>>> I don't think anyone knows what the alpha compression scheme is.
>>>
>>> The compression scheme for ProRes' alpha is basically the same as for
>>> the other three components, i.e. run-length coding + variable-length
>>> codewords. I'm currently preparing a description on how it works, so
>>> someone else could reimplement it...
>>>
>>>> Also it is a patent violation in the US and possibly other places so
>>>> use accordingly.
>>>
>>> Fortunately, software patents are void in Europe:-)
>>>
>>> Best regards
>>> Maxim Poliakovski
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>>>
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>
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Adding the new colour spaces looks straight forward, but I've no idea 
how you go about testing them, are there any tools for doing this ?