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Apply changes from TTML1 clarifying epoch (#358). #602

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Feb 8, 2018
Merged

Apply changes from TTML1 clarifying epoch (#358). #602

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apply changes from TTML1
cconcolato Jan 29, 2018
3c81374
Merge branch 'master' into issue-0358-ttml1-0266
skynavga Feb 8, 2018
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8 changes: 6 additions & 2 deletions spec/ttml2.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -23408,12 +23408,15 @@ the rate of playback (or interpretation) of time may artificially dilated or nar
playback of a <loc href="#terms-related-media-object">related media object</loc>. Without loss of generality, the following discussion assumes a fixed play(back) rate. In the case of
variable play rates, appropriate adjustments may need to be made to the resulting computations.</p>
</note>
<p>The <loc href="#terms-document-processing-context">document processing context</loc> defines the applicable epoch and any epoch-related offsets
to be used when establishing the <loc href="#terms-synthetic-document-syncbase">synthetic document syncbase</loc>.</p>
<div2 id="time-expression-semantics-clock">
<head>Clock Time Base</head>
<p>When operating with the <code>clock</code> time base, the following semantics apply for interpreting time expressions,
as defined by <loc href="#timing-value-time-expression">&lt;time-expression&gt;</loc>, and their relationship to media time and local real time.</p>
<p>The clock time base <phrase role="strong"><code>C</code></phrase> is related to local real time <phrase role="strong"><code>R</code></phrase>
expressed in an arbitrary (implementation defined) epoch <phrase role="strong"><code>E</code></phrase>
expressed in the epoch <phrase role="strong"><code>E</code></phrase> (defined by the
<loc href="#terms-document-processing-context">document processing context</loc>)
as follows:</p>
<table id="clock-time-and-real-time" role="semantics">
<caption>TTML Semantics &ndash; Clock Time and Real Time Relationship</caption>
Expand Down Expand Up @@ -23543,7 +23546,8 @@ during playback, presentation timing is not affected.
<p>When operating with the <code>media</code> time base, the following semantics apply for interpreting time expressions,
as defined by <loc href="#timing-value-time-expression">&lt;time-expression&gt;</loc>, and their relationship to media time and local real time.</p>
<p>The media time base <phrase role="strong"><code>M</code></phrase> is related to local real time <phrase role="strong"><code>R</code></phrase>
expressed in an arbitrary (implementation defined) epoch <phrase role="strong"><code>E</code></phrase> as follows:</p>
expressed in the epoch <phrase role="strong"><code>E</code></phrase> (defined by the
<loc href="#terms-document-processing-context">document processing context</loc>) as follows:</p>
<table id="media-time-and-real-time" role="semantics">
<caption>TTML Semantics &ndash; Media Time and Real Time Relationship</caption>
<tbody>
Expand Down