Comments (9)
palemieux
commented on July 19, 2024
Just wanna ask, do we support region info conversion for TTML to VTT? or do we have any plans to support it?
The WebVTT writer does not currently support regions.
AFAIK there is no ongoing work to add support for regions, but such addition would be welcome I would think.
Are regions widely supported in WebVTT players?
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wang-xinyu
commented on July 19, 2024
@palemieux Thanks for your time.
I think region of WebVTT is not widely supported, I tried Safari native player before, which doesn't support region of WebVTT, but VLC does support region of WebVTT.
So as a compromise, region of TTML can be mapped into line/position/align of WebVTT to do the same thing.
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palemieux
commented on July 19, 2024
So as a compromise, region of TTML can be mapped into line/position/align of WebVTT to do the same thing.
Ok. Would you be able to provide (short) sample TTML documents with the expected WebVTT outcome?
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palemieux
commented on July 19, 2024
@wang-xinyu P.S.: Only one or two short samples are needed -- to make sure the conversion basically works and to create unit tests. You can use the renderer at https://www.sandflow.com/imsc1proc/index.html to render TTML.
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wang-xinyu
commented on July 19, 2024
@palemieux Cool, got it, will do it by end of next week.
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wang-xinyu
commented on July 19, 2024
@palemieux This the TTML example with region
<?xml version="1.0" encoding="UTF-8"?>
<!-- Subtitles file created by EZConvert V version 5.2.10 -->
<tt xml:lang="en-US" xmlns="http://www.w3.org/ns/ttml" xmlns:tts="http://www.w3.org/ns/ttml#styling" xmlns:ttp="http://www.w3.org/ns/ttml#parameter" xmlns:ttm="http://www.w3.org/ns/ttml#metadata" ttp:frameRate="24" ttp:frameRateMultiplier="1000 1001" ttp:profile="http://www.w3.org/ns/ttml/profile/imsc1/text" ttp:timeBase="media">
<head>
<metadata/>
<styling>
<style xml:id="style.center" tts:fontFamily="Arial" tts:fontSize="100%" tts:fontStyle="normal" tts:fontWeight="normal" tts:backgroundColor="transparent" tts:color="white" tts:textAlign="center"/>
</styling>
<layout>
<region xml:id="region.after" tts:displayAlign="after" tts:backgroundColor="transparent" tts:origin="10% 10%" tts:extent="80% 80%"/>
<region xml:id="region.before" tts:displayAlign="before" tts:backgroundColor="transparent" tts:origin="10% 10%" tts:extent="80% 80%"/>
</layout>
</head>
<body>
<div>
<p style="style.center" region="region.after" begin="00:00:03:12" end="00:00:12:00">Only one or two short samples are needed<br/>to make sure the conversion basically works</p>
<p style="style.center" region="region.before" begin="00:00:14:09" end="00:00:25:17">Cool, got it, will do it by end of next week.</p>
</div>
</body>
</tt>
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palemieux
commented on July 19, 2024
@wang-xinyu Please review #359
What VTT parser/renderer do you use for testing?
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palemieux
commented on July 19, 2024
@wang-xinyu Ping
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wang-xinyu
commented on July 19, 2024
@palemieux Sorry for delayed reply, already replied in the PR.
And I usually use VLC, quicktime player to test webvtt subtitle.
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