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RE: Interval logic and multiple begins with negative offset

From: Patrick Schmitz <cogit@ludicrum.org>
Date: Thu, 12 Aug 2004 08:55:59 -0700
To: <navil@emuzed.com>
Cc: <www-smil@w3.org>
Message-ID: <ENEGINNFOHPGHPIICCFJGEBGGAAA.cogit@ludicrum.org>

The first begin time of video 1 is precluded by the duration of par1, and so
is removed (pruned) as a valid interval. When it is removed, this is
propagated to dependents, and they must remove the initial begin as a valid
begin time instance.

See http://www.w3.org/TR/smil20/smil-timing.html#q86

And in particular the verbiage:

"...When an interval is pruned, it will not be shown, it will not raise
begin or end events, and any associated instance times for syncbase time
dependents must be removed from the respective instance times lists. It is
as though the pruned interval had not been specified.
..."

> -----Original Message-----
> From: www-smil-request@w3.org [mailto:www-smil-request@w3.org]On Behalf
> Of John Navil Joseph
> Sent: Thursday, August 12, 2004 6:20 AM
> To: www-smil@w3.org
> Subject: Interval logic and multiple begins with negative offset
>
>
>
> Hi,
>
> I am having trouble understanding the following SMIL 2.0 test case.
>
> Could some one tell me why "video2" begins to be shown only at 9 sec
> and not at 5 seconds?
>
> "video1" begin is resolved to 10s document time, for (both intervals of
> par),
> then "video2" begin is resolv          edto5sdocumenttime.Thenwhyisvideo2
> shown only at 9 sec and not from 5 seconds as expected?
>
> TIA,
> John
>
>
> <!--
>              Copyright: Copyright 1998-2001 W3C (MIT, INRIA, Keio), All
> Rights Reserved.
>
> See http://www.w3.org/Consortium/Legal/.
>
> Author: Aaron Cohen (Intel), Jeff Boston (IBM)
>             Version: May 1, 2001
>              Module: Timing and Synchronization
>             Feature: Interval logic and multiple begins with
> negative offset
>           File Name: interval_logic_multiple_begins_negative_offset.smil
>    Media Components: 2 QT, 1 JPG
>   Expected Behavior: at t=9  video2 starts 4 seconds into the video.
>                            at t=10 smile appears.
>                            at t=10 video1 starts.
>                          at t=15 video2 disappears.
>                          at t=19 video1 disappears.
>                          at t=20 smile disappears.
> -->
> <smil xmlns="http://www.w3.org/2001/SMIL20/Language">
> <body>
>          <par>
>                  <img id="smile" begin="10s" dur="10s"
> src="../images/smile.jpg"/>
>                  <par id="par1" begin="0s;10s" dur="9s">
>                          <video id="video1" begin="sm
> ile.begindur=10s
> src="../videos/nasa.qt"/>
>                  </par>
>                  <video id="video2" begin="vi      deo1.begin-5sdur=10s
> src="../videos/nasa.qt"/>
>          </par>
> </body>
> </smil>
>
Received on Thursday, 12 August 2004 15:56:24 UTC

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