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Convert WebVTT to EBU STL

Convert WebVTT to EBU STL

/vtt-to-stl

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About WebVTT to EBU STL Conversion

A quick guide to converting from WebVTT (.vtt) to EBU STL (.stl). Learn about format differences, what's preserved, and how to convert your subtitles.

    Key Differences Between WebVTT and EBU STL

    • Format Structure: WebVTT uses a web-optimized format with header and cues while EBU STL uses a professional broadcast format with header metadata
    • Styling Support: WebVTT supports CSS-style formatting and positioning while EBU STL includes broadcast-standard formatting
    • Software Compatibility: WebVTT is primarily used with Google Chrome, Mozilla Firefox, Safari, while EBU STL is commonly used with undefined, undefined, undefined
    • Use Cases: WebVTT is typically used for web-based video platforms, while EBU STL is preferred for broadcast television

Format Structure Examples

WebVTT Format Example

WEBVTT

00:00:01.000 --> 00:00:04.000
First line of subtitle text
Second line of subtitle text

00:00:05.000 --> 00:00:08.000
Next subtitle block

EBU STL Format Example

//EBU STL Subtitle File
$FontName       = Arial
$FontSize       = 30
$ColorIndex     = 1
$TapeNumber     = 1
$PageNumber     = 1
$TotalPages     = 1
$MaxRows        = 11
$TimeCodeFormat = 1

00:00:01:00,00:00:04:00
First line of subtitle text
Second line of subtitle text

00:00:05:00,00:00:08:00
Next subtitle block

What's Preserved in Conversion

  • Timing information and synchronization
  • Text content and line breaks
  • Basic text formatting
  • Character encoding
  • Language identification

What's Lost in Conversion

  • Broadcast-specific features
  • Professional metadata
  • Teletext compatibility

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Compatible Software

EBU STL can be opened with:

Conversion Features with Checksub

  • Automatic WebVTT format detection
  • Precise timing conversion from WebVTT to EBU STL
  • Smart text formatting adaptation
  • Character encoding handling (UTF-8, Unicode)
  • Format-specific optimizations for EBU STL
  • Error checking and validation

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