Strange Crashes related to player on many channels synth - windows wasapi exclusive mode

[santoxyz]

Using fluidsynth 2.4.5 API under windows; downloaded the prebuilt version fluidsynth-2.4.5-win10-x64.zip .

In my scenario, for performance reasons, to have the minimum latency possible, we use WASAPI driver with exclusive mode ON.
Exclusive mode forces us to use a single synth.
We must support various MIDI realtime midi sources, mapped on channels >16 and a fluid_player mapped on first 16 channels.
The app seems to crash on the second or third fluid_player_stop / fluid_player_seek or new_fluid_player / fluid_player_add also if the realtime channels are not used currently.
To change the backing track we delete_fluid_player and create a new_fluid_player adding the new .mid to it, using the same synth instance reference.
I know about the red flag to not delete the player when the synth is processing, but how to know it?
And BTW the crashes occurs also on seek, not only when trying to create a new player....

If I shrink the channels to the default number of 16, no problems occurs.

Is this eligible to open a new issue as a BUG?
Please help,

[derselbst]

I know about the red flag to not delete the player when the synth is processing, but how to know it?

You know it, because you're running an audio driver for that synth instance. Hence if you still call delete_fluid_player you're causing it to crash. It's your bug.

Fluidsynth's MIDI player has not been designed for your use-case. What you want to do is using a MIDI parsing library, so that your application takes care of handling those "various MIDI realtime midi sources", syncing them somehow and then create fluid_event_ts from it that you dispatch to the MIDI sequencer.

There will be a single synth, configured for more than 16 MIDI channels.
There will be single sequencer, with that synth registered as destination.
Your app will be feeding events to the sequencer in a customized and synchronized way that you consider to be correct.
And lastly, there will be an audio driver, which continuously renders audio from the synth.