[XviD-devel] Aspect Ratio

[peter ross]

>From: Christoph Lampert <chl@math.uni-bonn.de>
>Hi,

Hello,

>I can of course easily add this, my question is only: What should we do?
>Add 3 flags to API (backport to "stable" perhaps later), or add another
>field to API-3 to support "extented" mode (arbitrary aspect ratios), too?

stable: add flags to xframe.general
dev: add flags and additional par_width and par_height fields
for custom aspect ratios.

on a related note,
some of the general flags are vol-based (quant_type, interlacing,
quarterpel, and aspectratio). currently xvid will write/force a vol
if quant_type, or the quantizer tables differ between two frames.
however the other stuff is assumed to be constant thoughough the video
sequence.

we need to decide whether to,
* support encoding of vol-based stuff across frames; or,
* permit the vol-based options to be specified only at codec startup.

i'd like to see xvid do as-much-as-possible on a per-frame basis.

>P.S. This is another feature which no other codec has ;-> great for
>homepage announcements...

yipeee.
petes awaiting the "xvid+obmc" annoucement... it's gonna be great,
given that no other codec OR _profile_ supports it... !

-- pete

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