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Added more detail from BBC Subtitle Guidelines

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chrisn committed Jul 23, 2018
1 parent 8428438 commit e9fd9a96a970717e392ce5c34224c8d06674c0ca
Showing with 48 additions and 8 deletions.
  1. +48 −8 index.html
@@ -77,12 +77,12 @@
publisher: "DVB",
date: "November 2017"
},
"BBC": {
title: "Subtitle Guidelines",
"BBC-SUBTITLES": {
title: "Subtitle Guidelines, Version 1.1.7",
href: "http://bbc.github.io/subtitle-guidelines/",
publisher: "BBC",
date: "May 2018"
},
},
}
};
</script>
@@ -205,13 +205,53 @@ <h3>HbbTV</h3>
<section>
<h3>BBC Subtitle Guidelines</h3>
<p>
The BBC in their guidelines for subtitles provide requirements for synchronisation
([[BBC]], section 5). In particular, the guidelines state: "The subtitles should match the pace of speaking as closely as possible.
Ideally, when the speaker is in shot, your subtitles should not anticipate speech by more than 1.5 seconds or hang up on
the screen for more than 1.5 seconds after speech has stopped."
The BBC Subtitle Guidelines ([[BBC-SUBTITLES]]) describe best practice
for authoring subtitles or captions. In particular, the guidelines state:
</p>
<blockquote>
<p>
<b>5.2 Match subtitle to pace of speaking</b>
</p>
<p>
The subtitles should match the pace of speaking as closely
as possible. Ideally, when the speaker is in shot, your subtitles
should not anticipate speech by more than 1.5 seconds or hang up on
the screen for more than 1.5 seconds after speech has stopped.
</p>
<p>
<b>6.1 Match subtitles to shot</b>
</p>
<p>
It is likely to be less tiring for the viewer if shot changes and
subtitle changes occur at the same time. Many subtitles therefore
start on the first frame of the shot and end on the last frame.
</p>
<p>
<b>6.2 Maintain a minimum gap when mismatched</b>
</p>
<p>
If you have to let a subtitle hang over a shot change, do not remove
it too soon after the cut. The duration of the overhang will depend
on the content.
</p>
<p>
<b>6.3 Avoid straddling shot changes</b>
</p>
<p>
Avoid creating subtitles that straddle a shot change (i.e., a subtitle
that starts in the middle of shot one and ends in the middle of shot
two). To do this, you may need to split a sentence at an appropriate
point, or delay the start of a new sentence to coincide with the shot
change.
</p>
</blockquote>
<p>
To meet these requirements, the playback system must honour the provided timings,
on the assumption that they are frame accurate to 25 frames per second, i.e.,
40 milliseconds per frame, and regardless of the actual video frame rate,
which may be adjusted dynamically according to the video encoding.
</p>
</section>

</section>
<section>
<h2>Gap analysis</h2>

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