“WebVTT is more complex than SRT, often containing position information (line:90%) and simple style tags (<b>, <i>). Standard conversion typically results in the loss of this metadata.”

Root Cause Analysis

Metadata passthrough

When parsing VTT files, Shanyi AI extracts the Header block and Cue Settings (such as align:start size:50%), preserving them as immutable elements to ensure that translated subtitles maintain exactly the same position and style in the player as the original.

Multilingual track generation

By integrating with our API, video platforms can automatically trigger the generation of .vtt files in dozens of languages upon video upload, enabling instant global content distribution.

Final Solution Summary

Deliver seamless localized subtitle support for HTML5 video players.