如何将TTML（定时文本标记语言）tick转换为秒

Question

有谁知道如何将TTML-tick转换为秒？例如，如何将“1281697500”转换为~2min7sec？

Answer 1

There should be a ttp:tickRate parameter on the root tt element, which defines the number of ticks per second. It's 1 if not specified. So if you have a TTML time expression with a tick metric like "1281697500t" then remove the t from the end and divide the number by the value of ttp:tickRate to get the value in seconds.

Note that use of ticks is only intended when working in a media timebase.

Link to ttp:tickRate: https://www.w3.org/TR/ttml1/#parameter-attribute-tickRate

Link to TTML Time Expression syntax: https://www.w3.org/TR/ttml1/#timing-value-timeExpression