[Matroska-devel] revisiting StereoMode tag and

Alok Ahuja waveletcoeff at gmail.com
Mon Aug 9 00:46:28 CEST 2010


On Sun, Aug 8, 2010 at 1:54 AM, Steve Lhomme <slhomme at matroska.org> wrote:

> On Sat, Aug 7, 2010 at 6:03 PM, Alok Ahuja <waveletcoeff at gmail.com> wrote:
>
>>
>>
>> On Sat, Aug 7, 2010 at 8:10 AM, Steve Lhomme <slhomme at matroska.org>wrote:
>>
>>> The problem is really when tracks are combined via Matroska and not
>>> inside the codec. So do "top-bottom", "checkerboard", etc make sense for the
>>> way to "mono" tracks can be combined or not ?
>>>
>>> [Alok] - I do not know of a practical example in which we have individual
>> tracks representing top view or bottom view only, or for that matter
>> checkerboard. Hence, they do not make sense for the StereoPosition tag
>>
>
> OK. Let's say it's OK for now... They don't make sense to me either. It's
> been taking a while to get rid of interlaced encoding, I hope this weirdo
> modes don't get much attention anyway...
>
>
>>
>>
>>> As you can see, when the tracks are defined as dependent, they need to
>>> define which part of the dependency they are. So what would it be in this
>>> case ?
>>>
>>>
>>> [Alok] - I think you have StereoPosition nailed correctly to define the
>> track dependency- left eye view, right eye view, background view. You could
>> consider an incremental and generic "reference view" track that could be
>> defined as a dependent of the other tracks. These references could be
>> numerous in nature, and it would be up to the codec to choose how they are
>> pertinent in the final representation.
>>
>
> Yes, There can be many reference variants of the same file. For now it's
> undefinied which one is used. Maybe I should add a UID per Dependency unit.
> So they can be referenced and tagged.
>

[Alok]: That sounds good.

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