[Matroska-users] Setting the right parameters for Matroska Stereo 3D

Steve Lhomme slhomme at matroska.org
Thu Oct 14 20:53:41 CEST 2010


Leaving it as is should be fine as the input and output pixel width
are the same.

On Thu, Oct 14, 2010 at 8:53 PM, Jörg Knitter <joerg.knitter at gmx.de> wrote:
>  Hi Steve,
>
> thank you very much for your clarification.
>
> Concerning 2): I refer to the "aspect ratio" setting in MKVmerge GUI. Should
> I leave this empty?
> I just have checked the MKV specs and haven´t seen any aspect ratio
> parameter, so now I really don´t understand the sense of this option - or is
> this also a deprecated field?
>
> With kind regards
>
> Joerg
>
> Am 14.10.2010 20:30, schrieb Steve Lhomme:
>>
>> 1: Yes you can use the StereoMode field with the value 1. It's an
>> integer and mkvmerge probably doesn't check the value is in a valid
>> range.
>>
>> 2: The aspect ratio is defined by the ratio the
>> DisplayWidth/DisplayHeight. And the way to tell the geometry of the
>> side-by-side videos is using the same fields. So you don't have to
>> worry about the aspect ratio. It is what you put in the
>> DisplayWidth/DisplayHeight
>>
>> 3: It's likely your pixel size is 1920x1080, each side being 960x1080.
>> But the output should also be 1920x1080 (horizontal stretching). So
>> you should use 1920x1080 for the PixelWidth/PixelHeight and
>> DisplayWidth/DisplayHeight as well. The fact that the video is marked
>> as side-by-side means the decoding system has to cut the 1920x1080
>> picture in 2 at the middle.
>>
>> Steve
>>
>> On Thu, Oct 14, 2010 at 1:57 AM, Jörg Knitter<joerg.knitter at gmx.de>
>>  wrote:
>>>
>>>  Hi,
>>>
>>> I want to make a 3D-side-by-side MKV that corresponds to the latest
>>> Matroska
>>> standardisation. But I have several questions, and I want to make sure
>>> that
>>> everything is set right:
>>> 1) Can I use the "old" StereoMode field with mkvmerge GUI and simply set
>>> it
>>> to "1" for "side-by-side; left video first" which corresponds to the
>>> "old"
>>> "left-eye" setting? If I read correctly, you first wanted to abandon the
>>> "StereoMode field" and now even improved it with the new options which
>>> unfortunately do not fit to the old ones...
>>> Or do I really have to wait for the new releases?
>>> 2) If the source video is full hd and side-by-side so that the picture of
>>> every eye gets only the half horizontal resolution (like 3D TV), does the
>>> aspect ratio still have to be 16:9?
>>> 3) What display size do I have to enter? The final display size
>>> (1920x1080)
>>> or the size of the image that has to be displayed for every eye and
>>> scaled
>>> by the player, in this case 960x1080?
>>>
>>> With kind regards
>>>
>>> Joerg Knitter
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