[whatwg] video tag: pixel aspect ratio

Ralph Giles giles at xiph.org
Wed Oct 15 11:11:30 PDT 2008

On Wed, Oct 15, 2008 at 2:40 AM, Ian Hickson <ian at hixie.ch> wrote:

> Is that not enough?

It is enough. Sander and Eduard have provided excellent arguments why
the pixel aspect ratio, and especially the frame rate, should be
represented as rationals in video formats. But as an override for
already broken video streams compliance to best practice does not
justify another data type in html5.

To put Anne's comment another way, one needs a gigapixel display
device before the difference between 1.0925 (rounded to only 5
figures) and 59/54 affects the behaviour of the scaling algorithm at
all. There aren't so many aspect ratios is common use--you're welcome
to choose the one nearest to the floating point value given if you
think it's important.


Ralph Giles
Xiph.org Foundation

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