[Theora-dev] Encoding paramaters...

[Maik Merten]

<000b01c46187$4a4aecc0$0100000a at tiger>
Message-ID: <40E7D55A.4050901 at gmx.net>

illiminable wrote:
> So which is the correct interpretation of offset for a decoder and
> encoder... is it centred (as in encoder example)... or is it with the top
> left corner pinned and padding on the bottom and right of the frame, or is
> it with the bottom left corner pinned with padding on the top and right of
> the frame or is it other ?


Figure 2.1 in ASCII:


|--    Picture Width              --|

+-------------------------------------------------+
|                Frame                            |
|       +-----------------------------------+     | ---
|       |                                   |     |  |
|       |       Picture                     |     |
|       |                                   |     | Picture Height
|       |                                   |     |
|       |                                   |     |
|       |                                   |     |  |
|       +-----------------------------------+     | ---  ---
|                                                 |       |   Picture
+-------------------------------------------------+      ---  Y-Offset
(0,0)

|-     -|
Picture
X-Offset


Centred seems to be correct. However, with X- and Y-Offset set to zero
and fitting Picture-Dimensions it should be possible to pin the picture
to the bottom left corner. (Latter could be more efficient because then
there are only 2 "sharp" picture-to-black edges prone to ringing)

Maik

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