不能支持Offset

[sh1n0b1]

I tried to set the offset on the LRC, but the application doesn't support offset. [offset:+/- 以毫秒为单位整体时间戳调整，+ 加快、提前LRC，- 减慢、延后LRC]

https://zh.wikipedia.org/wiki/LRC%E6%A0%BC%E5%BC%8F