Re: clip-begin and clip-end

On Wed, Jul 21 1999 Dmitry Beransky wrote:

> Hi all,
> 
> What role do clip-begin and clip-end attributes play in computing an 
> object's duration and end time?  The spec seems to be quiet on this 
> issue.  The only thing it says is that "If the value of the "clip-end" 
> attribute exceeds the duration of the media object, the value is ignored, 
> and the clip end is set equal to the effective end of the media 
> object."  But what if the object has no explicit duration or end, but has a 
> clip-end property, how the computations are done in this case.  There are 
> other scenarios that involve the use of the clip-* properties that are not 
> covered by the spec.

Effectively, clip-begin and clip-end set the intrinsic duration of the 
media object.  The calculations for end time and duration involve the
intrinisic duration of the media object.  By selecting only a part of
the media object using the clip attributes, you effectively change the 
intrinsic duration of the object.

-- Sjoerd Mullender <sjoerd.mullender@oratrix.com>