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[whatwg] video tag: pixel aspect ratio

From: Sander van Zoest <sander@vanzoest.com>
Date: Tue, 14 Oct 2008 10:13:32 -0700
Message-ID: <98c2a8300810141013h7eca2d8ai85f9d4b2a5b1d909@mail.gmail.com>
On Tue, Oct 14, 2008 at 9:39 AM, Sander van Zoest <sander at vanzoest.com>wrote:

>
> Hi,
>
> I just recently started looking at HTML5 and noticed the video tag. Neat
> addition.
> I also noticed that it as an attribute named 'pixelratio', however, as you
> know this
> is never an integer, but rather is the result of a fraction (i.e. ratio).
> As for proper
> playback of video frames, it is important to understand exact float and
> therefore
> I would suggest either expressing it as a ratio of two 32-bit integers
> separated by a colon (or slash) or use two
> different attributes. This avoids unintentional rounding.
>
> Something roughly along the lines of:
>
> <video pixelratio="10:11"> <!-- 525 composite NTSC -->
> <video pixelratio="59:54"> <!-- 625 composite PAL -->
> <video pixelratio="1018:1062"> <!-- 1920x1035 HDTV SMPTE RP 187-1995 -->
>
> <video parhSpacing="10" parvSpacing=11">
>
> Container formats tend to store this information in a ratio like this and
> not in a float.
>

Please excuse me for referencing the video tag as, after further reading, it
is apparent that the pixelratio attribute is applied to the source tag.
Regardless, I believe the same points apply, so therefore please mentally
/video/source/ . Thank you and sorry for the confusion and stress I may
caused.

-- Sander
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