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

Steve Lhomme slhomme at matroska.org
Thu Oct 14 20:30:46 CEST 2010

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

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

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.


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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