A script triggered by a certain marker

[Stephan S]

Hey there, I'd like to automate recalls of mixer scenes with scripts that are triggered by markers.

I have learned that this is the line that has to be executed:

Code:

Session:apply_nth_mixer_scene(0)

Where the number 0 is the first mixer scene.

What do I have to do/write if I want scenes nr 1-8 to be triggered by markers 1-8 (or given names like verse/chorus etc.)

[johndev]

Attached is a script that works for me.

A few caveats:

1. Requires Mixbus/32C v8.2 or higher. v8.1.378 and lower don't recognise "Temporal" in Lua session scripts so will throw an error and fail.
   
2. Someone with experience in session scripts, timing, etc. might point out better / more efficient ways to do this.
   
3. If a triggering marker is extremely close to other markers (within a sample buffer, e.g. right on top of each other) then it might fail to find that triggering marker, so won't trigger.
   

It's looking for markers named "MS x" where x is a number between 1 and 8. You can change that naming requirement by altering this line of code:

Code:

local MIXER_SCENE_MARKER_PREFIX = "MS "

EDIT: I found that this wasn't working so have attached a replacement. It just replaces this line...

Code:

if (pos + n_samples > mpos:samples()) then

...with...

Code:

if (pos + n_samples >= mpos:samples()) then

I'm not sure why it used to work but no longer does. It's a different session in a later version of Mixbus. I suspect it was just luck of the draw whether it ever worked before.

[Stephan S]

Fantastic, thanks a lot. I have recording sessions atm but will try asap. I have the M1 version though, its 8.1 something- have to be patient propably.

[Dingo]

Fantastic, thanks a lot. I have recording sessions atm but will try asap. I have the M1 version though, its 8.1 something- have to be patient propably.

8.2 is being released ...  https://forum.harrisonconsoles.com/thread-11080.html

[Stephan S]

Whow, great- what a timing -))

[Stephan S]

How can I open a stored script, or don't I have to? 
Both ways don't seem to work, also when I paste the content into a new script.

When copy/pasted it looks that at least I can run it. When running after having started the song it shows:

Code:

LuaException: [string "..."]:39: attempt to perform arithmetic on a nil value (local 'n_samples')

When running before starting the song, nothing happens.


...and:
- What "type" is it? I tried "EditorAction and "Snippet"
- Do I name the marker (and the scene) MS x with a space or without (MSx)?

[johndev]

It's a session script. Add it in Edit > Script Manager > Session Scripts after placing the script in the scripts folder (Ardour manual tells you where that is if Mixbus manual doesn't).

MS x with space. If you don't want a space then change the line I mentioned to say "MS" instead.

[Stephan S]

Ah- at least now something happens. It crashes. With the following log (Mac Arm CPU):

Code:

0   libardour.dylib                          0x102ccc48c luabridge::CFunc::CallMember<Temporal::timepos_t (ARDOUR::Locations::*)(Temporal::timepos_t const&, bool), Temporal::timepos_t>::f(lua_State*) + 332
1   libardour.dylib                          0x102ccc484 luabridge::CFunc::CallMember<Temporal::timepos_t (ARDOUR::Locations::*)(Temporal::timepos_t const&, bool), Temporal::timepos_t>::f(lua_State*) + 324
2   libardour.dylib                          0x10319a4ec luaD_precall + 636
3   libardour.dylib                          0x10319ad08 luaV_execute + 428
4   libardour.dylib                          0x103194538 f_call(lua_State*, void*) + 100
5   libardour.dylib                          0x103194268 luaD_pcall + 96
6   libardour.dylib                          0x10319410c lua_pcallk + 264
7   libardour.dylib                          0x1031a8cc4 luaB_pcall(lua_State*) + 288
8   libardour.dylib                          0x10319a4ec luaD_precall + 636
9   libardour.dylib                          0x10319ad08 luaV_execute + 428
10  libardour.dylib                          0x103194538 f_call(lua_State*, void*) + 100
11  libardour.dylib                          0x103194268 luaD_pcall + 96
12  libardour.dylib                          0x10319410c lua_pcallk + 264
13  libardour.dylib                          0x102bd0460 luabridge::LuaException::pcall(lua_State*, int, int, int) + 36
14  libardour.dylib                          0x10300dd30 ARDOUR::Session::try_run_lua(unsigned int) + 108
15  libardour.dylib                          0x10305aea4 ARDOUR::Session::process_with_events(unsigned int) + 1900
16  libardour.dylib                          0x103058e38 ARDOUR::Session::process(unsigned int) + 468
17  libardour.dylib                          0x102a2ab7c ARDOUR::AudioEngine::process_callback(unsigned int) + 1988
18  libcoreaudio_backend.dylib               0x1089bed5c ARDOUR::CoreAudioBackend::process_callback(unsigned int, unsigned long long) + 988
19  libcoreaudio_backend.dylib               0x1089c966c ARDOUR::CoreAudioPCM::render_callback(unsigned int*, AudioTimeStamp const*, unsigned int, unsigned int, AudioBufferList*) + 448
20  CoreAudio                                0x10e3bd4fc 0x10e3b0000 + 54524
21  CoreAudio                                0x1b15d0750 HALC_ProxyIOContext::IOWorkLoop() + 6312
22  CoreAudio                                0x1b15ce8b0 invocation function for block in HALC_ProxyIOContext::HALC_ProxyIOContext(unsigned int, unsigned int) + 100
23  CoreAudio                                0x1b179aab0 HALB_IOThread::Entry(void*) + 88
24  libsystem_pthread.dylib                  0x1afa3026c _pthread_start + 148
25  libsystem_pthread.dylib                  0x1afa2b08c thread_start + 8

Should I post this in MacOS forum?

[Dingo]

@StephanS - Well it looks like something in your Lua script is causing havoc.
With macOS crash reports, best to copy the entire crash report - add a note at the top as to what was happening prior to the crash and email them to support: mixbus@harrisonconsoles.com.

[x42]

Ah- at least now something happens. It crashes. With the following log (Mac Arm CPU):

Code:

0   libardour.dylib                      0x102ccc48c luabridge::CFunc::CallMember<Temporal::timepos_t (ARDOUR::Locations::*)(Temporal::timepos_t const&, bool), Temporal::timepos_t>::f(lua_State*) + 332
1   libardour.dylib                      0x102ccc484 luabridge::CFunc::CallMember<Temporal::timepos_t (ARDOUR::Locations::*)(Temporal::timepos_t const&, bool), Temporal::timepos_t>::f(lua_State*) + 324
2   libardour.dylib                      0x10319a4ec luaD_precall + 636
3   libardour.dylib                      0x10319ad08 luaV_execute + 428
4   libardour.dylib                      0x103194538 f_call(lua_State*, void*) + 100
5   libardour.dylib                      0x103194268 luaD_pcall + 96
6   libardour.dylib                      0x10319410c lua_pcallk + 264
7   libardour.dylib                      0x1031a8cc4 luaB_pcall(lua_State*) + 288
8   libardour.dylib                      0x10319a4ec luaD_precall + 636
9   libardour.dylib                      0x10319ad08 luaV_execute + 428
10  libardour.dylib                      0x103194538 f_call(lua_State*, void*) + 100
11  libardour.dylib                      0x103194268 luaD_pcall + 96
12  libardour.dylib                      0x10319410c lua_pcallk + 264
13  libardour.dylib                      0x102bd0460 luabridge::LuaException::pcall(lua_State*, int, int, int) + 36
14  libardour.dylib                      0x10300dd30 ARDOUR::Session::try_run_lua(unsigned int) + 108
15  libardour.dylib                      0x10305aea4 ARDOUR::Session::process_with_events(unsigned int) + 1900
16  libardour.dylib                      0x103058e38 ARDOUR::Session::process(unsigned int) + 468
17  libardour.dylib                      0x102a2ab7c ARDOUR::AudioEngine::process_callback(unsigned int) + 1988
18  libcoreaudio_backend.dylib           0x1089bed5c ARDOUR::CoreAudioBackend::process_callback(unsigned int, unsigned long long) + 988
19  libcoreaudio_backend.dylib           0x1089c966c ARDOUR::CoreAudioPCM::render_callback(unsigned int*, AudioTimeStamp const*, unsigned int, unsigned int, AudioBufferList*) + 448
20  CoreAudio                            0x10e3bd4fc 0x10e3b0000 + 54524
21  CoreAudio                            0x1b15d0750 HALC_ProxyIOContext::IOWorkLoop() + 6312
22  CoreAudio                            0x1b15ce8b0 invocation function for block in HALC_ProxyIOContext::HALC_ProxyIOContext(unsigned int, unsigned int) + 100
23  CoreAudio                            0x1b179aab0 HALB_IOThread::Entry(void*) + 88
24  libsystem_pthread.dylib              0x1afa3026c _pthread_start + 148
25  libsystem_pthread.dylib              0x1afa2b08c thread_start + 8

Should I post this in MacOS forum?

Are you running Mixbus 8.2? -- The script won't work in older versions.