I guess it depends what you want to do with the timecode.
I'm not an Jack expert, but I have written quite a bit of timecode handling software.
What are you trying to achieve?
Phil
From: 1213729945 <1213729945@qq.com>
To: jack-devel <jack-devel@jackaudio.org>
Sent: Wednesday, 9 January 2019, 2:58
Subject: [Jack-Devel] windows