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字幕转换与同步（SRT ↔ VTT）.
在 SRT 与 WebVTT 之间转换字幕，整体提前或延后，转换帧率，并按第一句和最后一句重新对齐时间轴。
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使用方法: 字幕转换与同步（SRT ↔ VTT）
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英语技术说明
Text subtitles only (no image-based formats such as PGS or VobSub). Everything is calculated in your browser; nothing you type is uploaded.
Timestamps are read in milliseconds and rewritten; shift adds an offset, frame-rate conversion multiplies times by old ÷ new rate, and two-point sync maps the first and last start times linearly.
Converting from 25 to 23.976 fps moves a line at 4.000 s to 4.171 s; syncing by two points fixes both an offset and a speed difference.