DBraun
Render hangs if no graph is loaded
I am trying to render 5 seconds of audio after loading a synth plugin and adding one MIDI note, but this has been running for several minutes and shows no signs of finishing. Here is the code I am using:
from scipy.io import wavfile
import dawdreamer as daw
import numpy as np
import os
SAMPLE_RATE = 44100
BUFFER_SIZE = 128 # Parameters will undergo automation at this buffer/block size.
PPQN = 960 # Pulses per quarter note.
SYNTH_PLUGIN = os.path.expanduser('~')+"/../../Library/Audio/Plug-Ins/VST/TAL-NoiseMaker.vst" # extensions: .dll, .vst3, .vst, .component
engine = daw.RenderEngine(SAMPLE_RATE, BUFFER_SIZE)
# Make a processor and give it the unique name "my_synth", which we use later.
synth = engine.make_plugin_processor("my_synth", SYNTH_PLUGIN)
synth.load_state('../resources/plugins/params/save_states/BasePad')
synth.add_midi_note(60, 127, 0.5, .25) # (MIDI note, velocity, start, duration)
engine.render(5) # THIS LINE IS WHERE THE CODE GETS STUCK RUNNING FOREVER
output = engine.get_audio()
wavfile.write(f'output.wav', SAMPLE_RATE, output.transpose())
For further context, I am running this on MacOS 10.15.7 with Python 3.10.4
Interesting, because that plugin is included in the automated tests for macOS: https://github.com/DBraun/DawDreamer/blob/bdc8947dc7aa99e141c0a081d4ba5bf0ccfd73b3/tests/dawdreamer_utils.py#L102
Does it work if you don't call load_state?
Did you call engine.load_graph([(synth, [])])? before render?
Can you try the TAL-NoiseMaker.vst that's included in the repo?
Adding this has fixed it!
engine.load_graph([(synth, [])])
Thanks for the quick help!
Tested and fixed in 0.6.14. I decided to make it throw a RuntimeError you can catch with a try clause.