Convert TTML Subtitles to SUB_MICRODVD Format
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About TTML
TTML (Timed Text Markup Language) is an XML-based standard for delivering timed text, meaning subtitles and captions, for web video and television broadcast. It's a W3C recommendation and is designed to be a professional, feature-rich format for the broadcast and streaming industry. It supports extensive styling, timing, and layout options and is the basis for many other professional formats like DFXP.
About SUB_MICRODVD
MicroDVD is a frame-based subtitle format, which means its timings are based on video frame numbers rather than timestamps. For example, a line might be defined to appear from frame 1000 to frame 1050. This can be very precise, but it also means the subtitle file is tied to a specific video file with a specific frame rate. If the frame rate changes, the subtitle timing will be incorrect.
TTML vs SUB_MICRODVD
| Feature | TTML | SUB_MICRODVD |
|---|---|---|
| Styling Support | true | false |
| Positioning Support | true | false |
| Animation Support | true | false |
| Learning Curve | expert | intermediate |
| Quality Rating | 5 | 2 |
| Patent Status | open standard | freeware |
| Year Introduced | 2010 | 1999 |
Frequently Asked Questions
Is TTML used by major streaming services?
Yes, TTML and its profiles (like DFXP for Netflix) are the backbone of subtitle delivery for many major streaming platforms, including Netflix, Hulu, and Amazon Prime Video, as well as in professional broadcasting. Its robustness and rich feature set make it ideal for these high-stakes environments.
Is TTML easy to create by hand?
No, TTML is not designed to be human-readable or easily editable by hand. Its XML structure is verbose and complex. It is typically generated and processed by professional authoring software and is not suitable for casual subtitling.
Why use frame numbers instead of time?
Frame-based timing can be very useful for video editors who work on a frame-by-frame basis. However, for general distribution and playback, time-based formats like SRT are much more flexible and reliable, as they are not dependent on the video's frame rate.
What happens if I use a MicroDVD file with the wrong frame rate video?
The subtitles will go out of sync. For example, if the subtitle file was created for a 25 fps video, but you play it with a 29.97 fps video, the subtitles will appear progressively earlier or later as the video plays.
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