Accessibility/Video Text Format Comparison
From MozillaWiki
On this page we will find a comparison of time-aligned text example files for several typical application areas. The example files are written in TTML, WebSRT and WMML and try to determine the simplicity/complexity of authoring these formats and whether they fall short in some requirements.
Note that the page is work-in-progress and there may be features in WebSRT and TTML that haven't been used yet and are noted as missing. Please provide feedback/improvements if you notice a mistake.
Contents
Subtitles
Simple, unformatted subtitles
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>x-subtitles</ttm:role>
</metadata>
</head>
<body>
<div>
<p begin="00:00:15.00" end="00:00:17.95">At the left we can see...</p>
<p begin="00:00:18.16" end="00:00:20.08">At the right we can see the...</p>
<p begin="00:00:20.11" end="00:00:21.96">...the head-snarlers</p>
<p begin="00:00:21.99" end="00:00:24.36">Everything is safe.<br/>Perfectly safe.</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US ; not sure how to specify that these are subtitles semantically ; not sure how to specify that this is plain text only 1 00:00:15.00 --> 00:00:17.95 At the left we can see... 2 00:00:18.16 --> 00:00:20.08 At the right we can see the... 3 00:00:20.11 --> 00:00:21.96 ...the head-snarlers 4 00:00:21.99 --> 00:00:24.36 Everything is safe. Perfectly safe.
WMML:
<!DOCTYPE wmml>
<wmml lang="en-US" kind="subtitles" profile="plainText" version="1.0">
<cuelist>
<cue start="00:00:15.00" end="00:00:17.95">At the left we can see...</cue>
<cue start="00:00:18.16" end="00:00:20.08">At the right we can see the...</cue>
<cue start="00:00:20.11" end="00:00:21.96">...the head-snarlers</cue>
<cue start="00:00:21.99" end="00:00:24.36">Everything is safe.<br/>Perfectly safe.</cue>
</cuelist>
</wmml>
Analysis:
- All three formats provide for the basic needs.
- You cannot specify the default language in WebSRT.
- You cannot specify the type of time-aligned text in WebSRT.
- You cannot specify the type of cue text in WebSRT.
Formatted subtitles
TTML:
<tt xml:lang="de-DE" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>x-subtitles</ttm:role>
</metadata>
<styling xmlns:tts="http://www.w3.org/ns/ttml#styling">
<style xml:id="s1"
tts:backgroundColor=rgba(0,0,0,0.5)
/>
</styling>
<layout xmlns:tts="http://www.w3.org/ns/ttml#styling">
<region xml:id="c1"
style="s1"
tts:textAlign="left"
/>
<region xml:id="c2"
style="s1"
tts:textAlign="right"
/>
</layout>
</head>
<body>
<div style="s1" >
<p region="c1" begin="00:00:15.00" end="00:00:17.95">
Auf der <span tts:fontStyle="italic">linken</span> Seite sehen wir...
</p>
<p region="c2" begin="00:00:18.16" end="00:00:20.08">
Auf der <span tts:fontWeight="bold">rechten</span> Seite sehen wir die....
</p>
<p begin="00:00:20.11" end="00:00:21.96" tts:color="red">
..die Enthaupter.
</p>
<p begin="00:00:21.99" end="00:00:24.36">
<!-- Can't just mark a section as emphasised - gotta choose how to emphasise -->
Alles ist <span tts:textDecoration="underline">sicher</span>.<br/>Vollkommen sicher.</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in de-DE ; not sure how to specify that these are subtitles semantically ; not sure how to specify that basic markup is used in cues 1 00:00:15.00 --> 00:00:17.95 A:start Auf der <i>linken</i> Seite sehen wir... 2 00:00:18.16 --> 00:00:20.08 A:end Auf der <b>rechten</b> Seite sehen wir die.... 3 00:00:20.11 --> 00:00:21.96 <1>...die Enthaupter. ; Can't just mark a section as emphasised - gotta choose how to emphasise 4 00:00:21.99 --> 00:00:24.36 <2>Alles ist sicher. Vollkommen <b>sicher</b>.
A CSS file would accompany this WebSRT file to provide for the colors:
::cue { background: rgba(0,0,0,0.5); }
::cue-part(1) { color: red; }
::cue-part(2, b) { font-style: normal; text-decoration: underline; }
WMML:
<wmml lang="de-DE" kind="subtitles" version="1.1">
<head>
<style type="text/css">
wmml {
background: rgba(0,0,0,0.5);
}
cue.c1 {
text-align: left;
}
cue.c2 span {
text-align: right;
}
</style>
</head>
<cuelist>
<cue id="c1" start="00:00:15.00" end="00:00:17.95">
Auf der <i>linken</i> Seite sehen wir...
</cue>
<cue id="c2" start="00:00:18.16" end="00:00:20.08">
Auf der <b>rechten</b> Seite sehen wir die....
</cue>
<cue id="c3" start="00:00:20.11" end="00:00:21.96" style="color: red;">
...die Enthaupter.
</cue>
<cue id="c4" start="00:00:21.99" end="00:00:24.36">
Alles ist <mark>sicher</mark>.<br/>Vollkommen sicher.
</cue>
</cuelist>
</wmml>
Analysis:
- WebSRT does not provide for default language specification.
- WebSRT does not provide a kind attribute to signify that these are subtitles
- WebSRT does not provide the type of cue text in WebSRT.
- TTML does not provide for special emphasis sections ("mark"-style).
Subtitles with hyperlink
TTML:
<tt xml:lang="de-DE" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>x-subtitles</ttm:role>
</metadata>
</head>
<body>
<div style="s1" >
<p region="c1" begin="00:00:15.00" end="00:00:17.95">
Auf der linken Seite sehen wir...
</p>
<p region="c2" begin="00:00:18.16" end="00:00:20.08">
Auf der rechten Seite sehen wir die....
</p>
<p begin="00:00:20.11" end="00:00:21.96" tts:color="red">
<!-- Have to use xlink to provide URL hyperlink in TTML -->
..die <span xlink:href="http://members.chello.nl/j.kassenaar/elephantsdream/subtitles.html"
xlink:actuate="onRequest" xlink:show="replace"
xmlns:xlink="http://www.w3.org/1999/xlink">Enthaupter</span>.
</p>
<p begin="00:00:21.99" end="00:00:24.36">
Alles ist sicher.<br/>Vollkommen sicher.</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in de-DE ; not sure how to specify that these are subtitles semantically ; not sure how to specify that special markup (innerHTML) is used in cues 1 00:00:15.00 --> 00:00:17.95 Auf der linken Seite sehen wir... 2 00:00:18.16 --> 00:00:20.08 Auf der rechten Seite sehen wir die.... 3 00:00:20.11 --> 00:00:21.96 ...die <a href="href="http://members.chello.nl/j.kassenaar/elephantsdream/subtitles.html">Enthaupter</a>. 4 00:00:21.99 --> 00:00:24.36 Alles ist sicher.<br/>Vollkommen sicher.
WMML:
<wmml lang="de-DE" kind="subtitles" version="1.1">
<cuelist>
<cue id="c1" start="00:00:15.00" end="00:00:17.95">
Auf der linken Seite sehen wir...
</cue>
<cue id="c2" start="00:00:18.16" end="00:00:20.08">
Auf der rechten Seite sehen wir die....
</cue>
<cue id="c3" start="00:00:20.11" end="00:00:21.96" style="color: red;">
...die <a href="http://members.chello.nl/j.kassenaar/elephantsdream/subtitles.html">Enthaupter</a>.
</cue>
<cue id="c4" start="00:00:21.99" end="00:00:24.36">
Alles ist sicher.<br/>Vollkommen sicher.
</cue>
</cuelist>
</wmml>
Analysis:
- TTML needs to use some XML namespace (e.g. xlink) to provide for hyperlinks.
- WebSRT does not provide for default language specification.
- WebSRT does not provide a kind attribute to signify that these are subtitles
- WebSRT does not provide the type of cue text in WebSRT.
- WebSRT does not provide for URL hyperlinking in cues other than in "any" markup
Top-to-bottom rendered subtitles
TTML:
<tt xml:lang="zh" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>x-subtitles</ttm:role>
</metadata>
<styling xmlns:tts="http://www.w3.org/ns/ttml#styling">
<style xml:id="s1"
tts:writingMode="tbrl"
/>
</styling>
<layout xmlns:tts="http://www.w3.org/ns/ttml#styling">
<region xml:id="subtitleArea"
style="s1"
tts:padding="2% 2% 2% 64%"
tts:textAlign="right"
/>
</layout>
</head>
<body>
<div style="s1">
<p begin="00:00:15.00" end="00:00:17.95">在左边我们可以看到...</p>
<p begin="00:00:18.16" end="00:00:20.08">在右边我们可以看到...</p>
<p begin="00:00:20.11" end="00:00:21.96">...捕蝇草械.</p>
<p begin"00:00:21.99" end="00:00:24.36">一切都安全.<br/>非常地安全.</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in zh ; not sure how to specify that these are subtitles 1 00:00:15.00 --> 00:00:17.95 A:start D:vertical L:98% 在左边我们可以看到... 2 00:00:18.16 --> 00:00:20.08 A:start D:vertical L:98% 在右边我们可以看到... 3 00:00:20.11 --> 00:00:21.96 A:start D:vertical L:98% ...捕蝇草械. 4 00:00:21.99 --> 00:00:24.36 A:start D:vertical L:98% 一切都安全. 非常地安全.
WMML:
<wmml lang="zh" kind="subtitles" version="1.1">
<head>
<style>
cue {
writing-mode: tb-rl;
margin: 2% 2% 2% 64%;
text-align: right;
}
</style>
</head>
<cuelist>
<cue start="00:00:15.00" end="00:00:17.95">在左边我们可以看到...</cue>
<cue start="00:00:18.16" end="00:00:20.08">在右边我们可以看到...</cue>
<cue start="00:00:20.11" end="00:00:21.96">...捕蝇草械.</cue>
<cue start="00:00:21.99" end="00:00:24.36">一切都安全.<br/>非常地安全.</cue>
</cuelist>
</wmml>
Analysis:
- TTML has no margin attribute, just padding.
- I am unclear if WebSRT's specification of tbrl rendering and the margins is correct.
- For WebSRT, you have to repeat placement for every cue.
Captions
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>caption</ttm:role>
<ttm:agent xml:id="Proog" type="character">
<ttm:name type="full">Proog</ttm:name>
</ttm:agent>
</metadata>
</head>
<body>
<div>
<p begin="00:00:15.00" end="00:00:17.95" ttm:agent="Proog">At the left we can see...</p>
<p begin="00:00:18.16" end="00:00:20.08" ttm:agent="Proog">At the right we can see the...</p>
<p begin="00:00:20.11" end="00:00:21.96" ttm:agent="Proog">...the head-snarlerss<br/>[Whizzing noises]</p>
<p begin="00:00:21.99" end="00:00:24.36" ttm:agent="Proog">Everything is safe.<br/>Perfectly safe.</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US ; not sure how to specify that these are captions 1 00:00:15.00 --> 00:00:17.95 <1> At the left we can see... 2 00:00:18.16 --> 00:00:20.08 <1> At the right we can see the... 3 00:00:20.11 --> 00:00:21.96 <1> ...the head-snarlers <sound> [Whizzing noises] 4 00:00:21.99 --> 00:00:24.36 <1> Everything is safe. <1> Perfectly safe.
WMML:
<wmml lang="en-US" kind="captions" version="1.1">
<cuelist>
<cue start="00:00:15.00" end="00:00:17.95" class="Proog">At the left we can see...</cue>
<cue start="00:00:18.16" end="00:00:20.08" class="Proog">At the right we can see the...</cue>
<cue start="00:00:20.11" end="00:00:21.96" class="Proog">...the head-snarlers<br/>[Whizzing noises]</cue>
<cue start="00:00:21.99" end="00:00:24.36" class="Proog">Everything is safe.<br/>Perfectly safe.</cue>
</cuelist>
</wmml>
Analysis:
- In WebSRT it is unclear what character/speaker a voice marker (e.g. <1>, <2>) maps to.
Lyrics
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>lyrics</ttm:role>
<ttm:title>Can't buy me Love</ttm:title>
<!-- it seems TTML doesn't provide for music title metadata -->
<ttm:name type="other">Beatkes, The</ttm:name>
<ttm:name type="other">Lennon & McCartney"</ttm:name>
<ttm:name type="other">Beatles 1 - 27 #1 Singles"</ttm:name>
<ttm:name type="other">Wooden Ghost"</ttm:name>
</metadata>
</head>
<body>
<div>
<p begin="00:00:00.45" end="00:00:05.60">
Can't <span begin="00:00.75">buy</span> <span begin="00:00.95">me</span> <span begin="00:01.40">love,</span> <span begin="00:02.60">love,</span> <span begin="00:03.95">love, </span> <span begin="00:05.30">love</span>
</p>
<p begin="00:00:05.90" end="00:00:08.90">
Can't <span begin="00:06.20">buy</span> <span begin="00:06.40">me</span> <span begin="00:06.70">love,</span> <span begin="00:08.00">love</span>
</p>
<p begin="00:00:09.35" end="00:00:11.55">
I'll <span begin="00:09.50">buy</span> <span begin="00:09.75">you</span> <span begin="00:10.15">a</span> <span begin="00:10.25">dia</span><span begin="00:10.50">mond</span> <span begin="00:10.75">ring</span> <span begin="00:11.10">my</span> <span begin="00:11.40">friend</span>
</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US ; not sure how to specify that these are lyrics ; not sure how to provide the music piece metadata 1 00:00:00.45 --> 00:00:05.60 Can't <00:00.75>buy <00:00.95>me<00:01.40>love, <00:02.60>love, <00:03.95>love, <00:05.30>love 2 00:00:05.90 --> 00:00:08.90 Can't <00:06.20>buy <00:06.40>me <00:06.70>love, <00:08.00>love 3 00:00:09.35 --> 00:00:11.55 I'll <00:09.50>buy <00:09.75>you <00:10.15>a <00:10.25>dia<00:10.50>mond <00:10.75>ring <00:11.10>my <00:11.40>friend
WMML:
<wmml lang="en-US" kind="lyrics" version="1.1">
<head>
<title>Can't buy me Love</title>
<meta name="m:title" content="Can't buy me love"/>
<meta name="m:artist" content="Beatles, The"/>
<meta name="m:author" cotent="Lennon & McCartney"/>
<meta name="m:album" content="Beatles 1 - 27 #1 Singles"/>
<meta name="m:by" content="Wooden Ghost"/>
</head>
<cuelist>
<cue start="00:00:00.45" end="00:00:05.60">
Can't <t at="00:00.75">buy</t> <t at="00:00.95">me</t> <t="00:01.40">love,</t> <t at="00:02.60">love,</t> <t at="00:03.95">love, </t> <t at="00:05.30">love</t>
</cue>
<cue start="00:00:05.90" end="00:00:08.90">
Can't <t at="00:06.20">buy</t> <t at="00:06.40">me</t> <t at="00:06.70">love,</t> <t at="00:08.00">love</t>
</cue>
<cue start="00:00:09.35" end="00:00:11.55">
I'll <t at="00:09.50">buy</t> <t at="00:09.75">you</t> <t at="00:10.15">a</t> <t at="00:10.25">dia</t><t at="00:10.50">mond</t> <t at="00:10.75">ring</t> <t at="00:11.10">my</t> <t at="00:11.40">friend</t>
</cue>
</cuelist>
</wmml>
Analysis:
- TTML doesn't seem to provide for music title metadata.
- WebSRT doesn't seem to provide for any metadata.
Karaoke
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>lyrics</ttm:role>
<ttm:title>Can't buy me Love</ttm:title>
<!-- it seems TTML doesn't provide for music title metadata -->
<ttm:name type="other">Beatkes, The</ttm:name>
<ttm:name type="other">Lennon & McCartney"</ttm:name>
<ttm:name type="other">Beatles 1 - 27 #1 Singles"</ttm:name>
<ttm:name type="other">Wooden Ghost"</ttm:name>
</metadata>
<styling xmlns:tts="http://www.w3.org/ns/ttml#styling">
<style tts:color="yellow" tts:fontWeight="bold"/>
</styling>
</head>
<body>
<div style="s1">
<p begin="00:00:00.45" end="00:00:05.60">
Can't <span begin="00:00.75">buy</span> <span begin="00:00.95">me</span> <span begin="00:01.40">love,</span> <span begin="00:02.60">love,</span> <span begin="00:03.95">love, </span> <span begin="00:05.30">love</span>
</p>
<p begin="00:00:05.90" end="00:00:08.90">
Can't <span begin="00:06.20">buy</span> <span sbegin="00:06.40">me</span> <span begin="00:06.70">love,</span> <span begin="00:08.00">love</span>
</p>
<p begin="00:00:09.35" end="00:00:11.55">
I'll <span begin="00:09.50">buy</span> <span begin="00:09.75">you</span> <span begin="00:10.15">a</span> <span begin="00:10.25">dia</span><span begin="00:10.50">mond</span> <span begin="00:10.75">ring</span> <span begin="00:11.10">my</span> <span begin="00:11.40">friend</span>
</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US ; not sure how to specify that these are lyrics ; not sure how to provide the music piece metadata 1 00:00:00.45 --> 00:00:05.60 <b>Can't <00:00.75>buy <00:00.95>me<00:01.40>love, <00:02.60>love, <00:03.95>love, <00:05.30>love</b> 2 00:00:05.90 --> 00:00:08.90 <b>Can't <00:06.20>buy <00:06.40>me <00:06.70>love, <00:08.00>love</b> 3 00:00:09.35 --> 00:00:11.55 <b>I'll <00:09.50>buy <00:09.75>you <00:10.15>a <00:10.25>dia<00:10.50>mond <00:10.75>ring <00:11.10>my <00:11.40>friend</b>
A CSS file would accompany this WebSRT file to provide for the colors:
- cue { color: yellow; font-weight: bold; }
WMML:
<wmml lang="en-US" kind="karaoke" version="1.1">
<head>
<title>Can't buy me Love</title>
<meta name="m:title" content="Can't buy me love"/>
<meta name="m:artist" content="Beatles, The"/>
<meta name="m:author" cotent="Lennon & McCartney"/>
<meta name="m:album" content="Beatles 1 - 27 #1 Singles"/>
<meta name="m:by" content="Wooden Ghost"/>
<style>
t {
font-weight: bold;
color: yellow;
}
</style>
</head>
<cuelist>
<cue start="00:00:00.45" end="00:00:05.60">
<t at="00:00:00.45">Can't</t> <t at="00:00.75">buy</t> <t at="00:00.95">me</t> <t="00:01.40">love,</t> <t at="00:02.60">love,</t> <t at="00:03.95">love, </t> <t at="00:05.30">love</t>
</cue>
<cue start="00:00:05.90" end="00:00:08.90">
<t at="00:00:05.90">Can't</t> <t at="00:06.20">buy</t> <t at="00:06.40">me</t> <t at="00:06.70">love,</t> <t at="00:08.00">love</t>
</cue>
<cue start="00:00:09.35" end="00:00:11.55">
<t at="00:00:09.35">I'll</a> <t at="00:09.50">buy</t> <t at="00:09.75">you</t> <t at="00:10.15">a</t> <t at="00:10.25">dia</t> <t at="00:10.50">mond</t> <t at="00:10.75">ring</t> <t at="00:11.10">my</t> <t at="00:11.40">friend</t>
</cue>
</cuelist>
</wmml>
Analysis:
- In TTML, not sure if the style in the elements is only activated at the begin time of the element or if that requires different markup.
Chapter markers
Simple Chapter Markers
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>x-chapters</ttm:role>
</metadata>
</head>
<body>
<div>
<p begin="00:00:00.00" end="00:00:18.00">Introductory Titles</p>
<p begin="00:00:18.01" end="00:01:10.00">The Jack Plugs</p>
<p begin="00:01:10.01" end="00:02:30.00">Robotic Birds</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US ; not sure how to specify that these are chapters 1 00:00:00.00 --> 00:00:18.00 Introductory Titles 2 00:00:18.01 --> 00:01:10.00 The Jack Plugs 3 00:01:10.01 --> 00:02:30.00 Robotic Birds
WMML:
<wmml lang="en-US" kind="chapters" version="1.1" profile="plainText">
<cuelist>
<cue start="00:00:00.00" end="00:00:18.00">Introductory Titles</cue>
<cue start="00:00:18.01" end="00:01:10.00">The Jack Plugs</cue>
<cue start="00:01:10.01" end="00:02:30.00">Robotic Birds</cue>
</cuelist>
</wmml>
Analysis:
- All three fulfill the needs for chapter markers.
Chapter Markers with Image
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>x-chapters</ttm:role>
</metadata>
</head>
<body>
<div>
<!-- Have to use xlink to provide URL hyperlink in TTML -->
<p begin="00:00:00.00" end="00:00:18.00">
<span xlink:href="intro.png"
xlink:actuate="onLoad" xlink:show="embed"
xmlns:xlink="http://www.w3.org/1999/xlink"></span>
Introductory Titles
</p>
<p begin="00:00:18.01" end="00:01:10.00">
<span xlink:href="plugs.png"
xlink:actuate="onLoad" xlink:show="embed"
xmlns:xlink="http://www.w3.org/1999/xlink"></span>
The Jack Plugs
</p>
<p begin="00:01:10.01" end="00:02:30.00">
<span xlink:href="birds.png"
xlink:actuate="onLoad" xlink:show="embed"
xmlns:xlink="http://www.w3.org/1999/xlink"></span>
Robotic Birds
</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US ; not sure how to specify that these are chapters ; not sure how to specify that the cues are special markup (innerHTML) ; not sure how to specify representative images for chapters 1 00:00:00.00 --> 00:00:18.00 <img src="intro.png"/> Introductory Titles 2 00:00:18.01 --> 00:01:10.00 <img src="plugs.png"/> The Jack Plugs 3 00:01:10.01 --> 00:02:30.00 <img src="birds.png"/> Robotic Birds
WMML:
<!DOCTYPE wmml>
<wmml lang="en-US" kind="chapters">
<cuelist>
<cue start="00:00:00.00" end="00:00:18.00"><img src="intro.png"/> Introductory Titles</cue>
<cue start="00:00:18.01" end="00:01:10.00"><img src="plugs.png"/> The Jack Plugs</cue>
<cue start="00:01:10.01" end="00:02:30.00"><img src="birds.png"/> Robotic Birds</cue>
</cuelist>
</wmml>
Analysis:
- In TTML we have to use xlink to specify representative images.
Texted audio descriptions
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>description</ttm:role>
</metadata>
</head>
<body>
<div>
<p begin="00:00:00.00" end="00:00:05.00">The orange open movie project presents</p>
<p begin="00:00:05.01" end="00:00:12.00">Introductory titles are showing on the background of a water pool with fishes swimming and mechanical objects lying on a stone floor.</p>
<p begin="00:00:11.01" end="00:00:14.80">elephants dream</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US ; not sure how to specify that these are audio descriptions ; not sure how to specify that this is plain text only 1 00:00:00.00 --> 00:00:05.00 The orange open movie project presents 2 00:00:05.01 --> 00:00:12.00 Introductory titles are showing on the background of a water pool with fishes swimming and mechanical objects lying on a stone floor. 3 00:00:11.01 --> 00:00:14.80 elephants dream
WMML:
<wmml lang="en-US" kind="descriptions" profile="plainText" version="1.1">
<cuelist>
<cue start="00:00:00.00" end="00:00:05.00">The orange open movie project presents</cue>
<cue start="00:00:05.01" end="00:00:12.00">Introductory titles are showing on the background of a water pool with fishes swimming and mechanical objects lying on a stone floor.</cue>
<cue start="00:00:11.01" end="00:00:14.80">elephants dream</cue>
</cuelist>
</wmml>
Analysis:
- All three formats provide for the needs for audio descriptions.
Timed Metadata
Timed slides for a presentations with slide transcripts.
TTML:
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml">
<head>
<metadata xmlns:ttm="http://www.w3.org/ns/ttml#metadata">
<ttm:role>x-subtitles</ttm:role>
<ttm:title>Really Achieving Your Childhood Dreams</ttm:title>
<ttm:name type="full">Randy Pausch</ttm:name>
<ttm:name type="other">Carnegie Mellon University</ttm:name>
<!-- not sure how to specify date and source -->
</metadata>
</head>
<body>
<div>
<!-- Have to use xlink to provide URL hyperlink in TTML -->
<p begin="00:00:00.00" end="00:00:44.00">
<span xlink:href="intro.png"
xlink:actuate="onLoad" xlink:show="embed"
xmlns:xlink="http://www.w3.org/1999/xlink"></span>
"Really Achieving Your Childhood Dreams" by Randy Pausch, Carnegie Mellon University,
Sept 18, 2007
</p>
<p begin="00:00:44.00" end="00:01:18.00">
<span xlink:href="elephant.png"
xlink:actuate="onLoad" xlink:show="embed"
xmlns:xlink="http://www.w3.org/1999/xlink"></span>
The elephant in the room...
</p>
<p begin="00:01:18.00" end="00:02:05.00">
<span xlink:href="denial.png"
xlink:actuate="onLoad" xlink:show="embed"
xmlns:xlink="http://www.w3.org/1999/xlink"></span>
I'm not in denial...
</p>
</div>
</body>
</tt>
WebSRT:
; not sure how to specify that this is in en-US
; not sure how to specify that these are timed slides
; not sure how to specify that the content is JSON
1
00:00:00.00 --> 00:00:44.00
{
slide: intro.png,
title: "Really Achieving Your Childhood Dreams" by Randy Pausch, Carnegie Mellon University, Sept 18, 2007
}
2
00:00:44.00 --> 00:01:18.00
{
slide: elephant.png,
title: The elephant in the room...
}
3
00:01:18.00 --> 00:02:05.00
{
slide: denial.png,
title: I'm not in denial...
}
WMML:
<!DOCTYPE wmml>
<wmml lang="en-US" kind="metadata">
<head>
<title>Really Achieving Your Childhood Dreams</title>
<meta name="dc:title" content="Really Achieving Your Childhood Dreams"/>
<meta name="dc:author" cotent="Randy Pausch"/>
<meta name="dc:location" content="Carnegie Mellon University"/>
<meta name="dc:date" content="18th Sept 2007"/>
<meta name="dc:source" content="http://www.labnol.org/home/randy-pausch-last-lecture-video-with-transcript/4211/"/>
</head>
<cuelist>
<cue start="00:00:00.00" end="00:00:44.00">
{
slide: intro.png,
title: "Really Achieving Your Childhood Dreams" by Randy Pausch, Carnegie Mellon University, Sept 18, 2007
}
</cue>
<cue start="00:00:44.00" end="00:01:18.00">
{
slide: elephant.png,
title: The elephant in the room...
}
</cue>
<cue start="00:01:18.00" end="00:02:05.00">
{
slide: denial.png,
title: I'm not in denial...
}
</cue>
</cuelist>
</wmml>
Analysis:
- TTML doesn't provide for random content in cues
- TTML seems to have the metadata markers required to specify Dublin Core only
- WebSRT doesn't allow to specify that the content is in metadata, more specifically JSON
