Rec & export from lua cmd

Getting Stuff Done How do I .... ?
#1

Hello comunity,

Is it possible to execute from command line lua script to load a session and start recording and export to a wav file.

I wanted to automatically triggered the record and export from the command line.

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Recording from script provide noise instead of silent
#2

Yes. Something like

#!/opt/Ardour-7.5.0/bin/ardour7-lua
reclen = 5 -- seconds

AudioEngine:set_backend("JACK", "", "")

-- open existing session "/tmp/lua-test/lua-test.ardour"
s = load_session ("/tmp/lua-test", "lua-test")
assert (s);

-- record-arm all tracks
for track in Session:get_tracks():iter() do
  track:rec_enable_control ():set_value (1, PBD.GroupControlDisposition.NoGroup)
end

-- rewind, record-enable transport state and roll
Session:goto_start()
Session:maybe_enable_record()
Session:request_roll (ARDOUR.TransportRequestSource.TRS_UI)

-- recording
for i = 1, (2 * reclen) do
  ARDOUR.LuaAPI.usleep (500000) -- 500ms
  print ("Recording", i / 2, "sec")
end

-- stop transport
Session:request_stop (false, false, ARDOUR.TransportRequestSource.TRS_UI)

ARDOUR.LuaAPI.usleep (500000) -- wait for 1/2 sec
s:save_state("")

-- export session
e = s:simple_export()
assert (e:check_outputs ())
e:run_export()
e = nil

close_session()
#3

Thanks for your fast answer.
It does record but I got a silent wav file. I also got over the command line these erros
Vamp::HostExt::PluginLoader: No library found in Vamp path for plugin “libardourvampplugins:ebur128”
Vamp::HostExt::PluginLoader: No library found in Vamp path for plugin “libardourvampplugins:dBTP”
Vamp::HostExt::PluginLoader: No library found in Vamp path for plugin “libardourvampplugins:dBTP”

I can see that the library is found under “C:\Program Files\Ardour7\lib\ardour7\vamp” but I don’t know how to set “Vamp path” from command line

Do you know how to set it?

#4

Oh Windows… I assume you don’t use JACK. Have you configured the backend?

backend = AudioEngine:set_backend("PortAudio", "", "")
backend:set_driver ("ASIO")
backend:set_device_name ("HDA Intel PCH") -- or similar
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#5

It worked now after setting
backend = AudioEngine:set_backend(“PortAudio (default)”, “”, “”)
e = backend:set_driver (“MME”)
backend:set_input_device_name (“Headset (Jabra Evolve2 65)”)

Also when I use set_device, it doesn’t work, I need to use set_input_device_name
Thank you very much for your support :slight_smile:

One last question is it possible to export each track into separate wave file from lua script?

#6

No. Stem Export can currently only be initiated from the GUI.

However, by default mono .wav files are used when recording. You could just grab the files directly from the session: <session-dir>\interchage\<session-name>\audiofiles\

1 Like
#7

perfect, thank you! very much :slight_smile: