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Render TTML subtitles #5879

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sjvudp opened this issue Mar 18, 2024 · 3 comments
Open

Render TTML subtitles #5879

sjvudp opened this issue Mar 18, 2024 · 3 comments
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@sjvudp
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sjvudp commented Mar 18, 2024

Description of the feature or enhancement you'd like to see in HandBrake

TTML subtitle files look quite similar to today's HTML, so I wonder whether supporting them to create "overlay subtitles" from the TTML would be too much of code bloat.

For example here's a very simple TTML example created by DaVince Resolve Studio 18:

<?xml version="1.0" encoding="UTF-8"?>
<tt xml:lang="en" xmlns="http://www.w3.org/ns/ttml" xmlns:ttm="http://www.w3.org/ns/ttml#metadata" xmlns:tts="http://www.w3.org/ns/ttml#styling" xmlns:ttp="http://www.w3.org/ns/ttml#parameter" xmlns:ittp="http://www.w3.org/ns/ttml/profile/imsc1#parameter" xmlns:itts="http://www.w3.org/ns/ttml/profile/imsc1#styling" ttp:profile="http://www.w3.org/ns/ttml/profile/imsc1/text" ttp:frameRate="24" ttp:timeBase="media">
  <head>
    <styling>
      <style xml:id="DE_style" tts:color="#ffffff" tts:opacity="1" tts:fontSize="100%" tts:fontFamily="proportionalSansSerif" tts:fontWeight="bold" tts:textOutline="#ffffff 1px" tts:textAlign="center"/>
    </styling>
    <layout>
      <region xml:id="DE" tts:origin="41.271% 74.884%" tts:extent="17.500% 10.278%" tts:displayAlign="center"/>
    </layout>
  </head>
  <body>
    <div xml:id="d0" region="DE" style="DE_style">
      <p begin="01:00:01.000" end="01:00:06.000">DE-utlich</p>
    </div>
  </body>
</tt>

Compared to SRT-type subtitles, this format obviously allows to specify the font, size, and other attributes.

What Operating System are you running?

Windows 10

What version of HandBrake are you running?

1.7.3 (2024021000)

Where did you download HandBrake from?

handbrake.fr

Activity Log, Crash Log or any other details

No response
@Nomis101
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This was already requested 4 years ago.
#2724

Back then there was no support for TTML in FFmpeg, some support has been added in the meantime.
https://github.com/search?q=repo%3AFFmpeg%2FFFmpeg+TTML&type=commits
Do not know how this changes the situation for HandBrake.

@sr55
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sr55 commented Mar 28, 2024

Does it by chance handle it if you embed it into the file to begin with?

We might have to make some tweaks for us to recognise it.

Do you have a sample file you can share please?

@sjvudp
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sjvudp commented Mar 28, 2024

Does it by chance handle it if you embed it into the file to begin with?

AFAIK my program to create those TTML files is not able to embed them (that's why I used HandBrake at all). The manual states:
As embedded captions: Outputs the currently selected subtitle track as an embedded
metadata layer within supported media formats. There is currently support for CEA-608 closed
captions within MXF OP1A and QuickTime files. You can choose the subtitle format from the
Codec pop-up that appears.

We might have to make some tweaks for us to recognise it.

Do you have a sample file you can share please?

A sample file of what exactly: A video, or a TTML file?

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@sr55 @sjvudp @Nomis101