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Convert SAMI to WebVTT

Convert SAMI to WebVTT

Converting from SAMI (SMI) to WebVTT (VTT) while maintaining timing accuracy and subtitle content.

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About SAMI to WebVTT Conversion

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

    Key Differences Between SAMI and WebVTT

    • Format Structure: SAMI uses a standard subtitle structure while WebVTT uses a web-optimized format with header and cues
    • Styling Support: SAMI has standard formatting capabilities while WebVTT supports CSS-style formatting and positioning
    • Software Compatibility: SAMI is primarily used with undefined, undefined, undefined, while WebVTT is commonly used with Google Chrome, Mozilla Firefox, Safari
    • Use Cases: SAMI is typically used for standard subtitle applications, while WebVTT is preferred for web-based video platforms

Format Structure Examples

SAMI Format Example

<SAMI>
<HEAD>
  <TITLE>Sample SAMI File</TITLE>
  <STYLE TYPE="text/css">
    <!--
    P { font-family: Arial; font-weight: normal; color: white; background-color: black; }
    .ENCC { Name: English; lang: en-US; SAMIType: CC; }
    -->
  </STYLE>
</HEAD>
<BODY>
  <SYNC Start=1000>
    <P Class=ENCC>First line of subtitle text<BR>Second line of subtitle text</P>
  </SYNC>
  <SYNC Start=5000>
    <P Class=ENCC>Next subtitle block</P>
  </SYNC>
  <SYNC Start=8000>
    <P Class=ENCC>&nbsp;</P>
  </SYNC>
</BODY>
</SAMI>

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

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

  • Web-specific styling features
  • CSS styling capabilities
  • Chapter and metadata markers

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Compatible Software

SAMI can be opened with:

Conversion Features with Checksub

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

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