Script lua at starting

[Aletheia (Dblanchemain)]

is it possible to automatically launch a lua script when starting Ardour?

[x42 (Robin Gareus)]

Not directly at application start, but when a session is loaded

A script can subscribe to signals, and the script then runs when a given event occurs.

Here is an example, after saving add it via Menu, Edit > Lua Scripts > Lua Script Manager > Action Hook

ardour {
  ["type"]    = "EditorHook",
  name        = "Rewind and Roll on Load",
  author      = "Ardour Team",
  description = "Session-load callback example",
}

-- subscribe to signals
-- http://manual.ardour.org/lua-scripting/class_reference/#LuaSignal.LuaSignal
function signals ()
  return LuaSignal.Set():add ({[LuaSignal.SetSession] = true})
end

-- create callback functions
function factory () return function (signal, ...)
  assert (signal == LuaSignal.SetSession)
  if not Session:transport_rolling() then
    Session:request_locate (0, false, ARDOUR.LocateTransportDisposition.MustRoll, ARDOUR.TransportRequestSource.TRS_UI)
  end
end end

[Aletheia (Dblanchemain)]

This works great with my script, however I have a problem with audio starting to play at the end of the script
I have this:

function factory () return function (signal, ...)
  assert (signal == LuaSignal.SetSession)
....
local playhead_is_at = Session:transport_sample ()
Session:request_locate (playhead_is_at, false, ARDOUR.LocateTransportDisposition.MustRoll, ARDOUR.TransportRequestSource.TRS_UI)

end end

Ardour loads audio files but causes randomness Segmentation fault
On the other hand, it works well in the context of an action script.
Why this ?