[Jack-Devel] jack1: jack_transport does not work as master

Hi, I'm still using debian's jackd1/libjack0 package (0.124.1) and have not tried to reproduce this with git master yet (at least, I haven't seen an obvious fix in the commit log since 0.124.1). In one terminal window I run jack_showtime. In the other window I do: jack_transport jack_showtime correctly shows the state, but no BBT information. From my own client I know that jack_position_t::valid==0. Some testing revealed that the timebase() callback in tools/transport.c is *not called at all*, although jack_set_timebase_callback is called and returns without error. - But everything works fine when I switch to the jack2 stack... And in some cases, when switching between/enabling/disabling different Transport masters, jack_position_t::valid retains the JackPositionBBT flag (and stale information) -- but no-one updates them any more... Maybe related: I've seen some strange values (*very* large negative number) for bar_start_tick when using ardour4.1. The very first time (and after rewind?) it contains 0.0 and is not updated. A quick glance into the ardour source code reveals that this field is not implemented yet. I could probably live with that. BUT: After stopping+starting the playback, these strange values appear... How can I know whether some value in this field is usable at all -- except for some heuristics? Back to the original topic... in both cases the jack_position_t struct contains stale/random values, instead of starting from a "clean" base -- maybe memset(,0,) is all that is needed here? Tobias