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/Applications/VLC.app/Contents/MacOS/VLC -I rc --demux=rawaud --rawaud-channels 2 --rawaud-samplerate 48000 avaudiocapture://BlackHole2ch_UID
I turned off resampling because I want no changes to the signal beyond volume control, and everything should already be using the correct/desired sample rate. See below for log output. Any help is appreciated, thanks!
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main debug: processing request item: avaudiocapture://BlackHole2ch_UID, node: Playlist, skip: 0
main debug: rebuilding array of current - root Playlist
main debug: rebuild done - 2 items, index 1
main debug: starting playback of new item
main debug: resyncing on avaudiocapture://BlackHole2ch_UID
main debug: avaudiocapture://BlackHole2ch_UID is at 1
main debug: creating new input thread
main debug: Creating an input for 'avaudiocapture://BlackHole2ch_UID'
main debug: requesting art for new input thread
main debug: using timeshift granularity of 50 MiB
main debug: using default timeshift path
main debug: `avaudiocapture://BlackHole2ch_UID' gives access `avaudiocapture' demux `rawaud' path `BlackHole2ch_UID'
main debug: creating demux: access='avaudiocapture' demux='rawaud' location='BlackHole2ch_UID' file='(null)'
main debug: looking for access_demux module matching "avaudiocapture": 14 candidates
main debug: looking for meta fetcher module matching "any": 1 candidates
avaudiocapture debug: avcapture uid = BlackHole2ch_UID
lua debug: Trying Lua scripts in /Users/htmac/Library/Application Support/org.videolan.vlc/lua/meta/fetcher
avaudiocapture debug: avcapture 0/8 USBStreamer:2752:0016 AppleUSBAudioEngine:miniDSP:USBStreamer:0001:1,2
avaudiocapture debug: avcapture 1/8 BlackHole2ch_ModelUID BlackHole2ch_UID
main debug: no meta fetcher modules matched
main debug: looking for art finder module matching "any": 2 candidates
avaudiocapture debug: Check user consent for access to the audio device
main debug: no art finder modules matched
main debug: selecting program id=0
avaudiocapture debug: AVCapture: Audio device ready!
main debug: using access_demux module "avaudiocapture"
main debug: Can't deduce slave type of "avaudiocapture://BlackHole2ch_UID" with file extension.
main debug: loading audio-es slave: avaudiocapture://BlackHole2ch_UID (forced: 1)
main debug: `avaudiocapture://BlackHole2ch_UID' gives access `avaudiocapture' demux `rawaud' path `BlackHole2ch_UID'
main debug: creating demux: access='avaudiocapture' demux='rawaud' location='BlackHole2ch_UID' file='(null)'
main debug: looking for access_demux module matching "avaudiocapture": 14 candidates
avaudiocapture debug: avcapture uid = BlackHole2ch_UID
avaudiocapture debug: avcapture 0/8 USBStreamer:2752:0016 AppleUSBAudioEngine:miniDSP:USBStreamer:0001:1,2
avaudiocapture debug: avcapture 1/8 BlackHole2ch_ModelUID BlackHole2ch_UID
avaudiocapture debug: Check user consent for access to the audio device
main debug: removing module "bonjour"
bonjour info: stopped discovery
main debug: Buffering 0%
main debug: Stream buffering done (5 ms in 4 ms)
main debug: Decoder wait done in 0 ms
main error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 0 ms)
main debug: ES_OUT_RESET_PCR called
main debug: Buffering 0%
main debug: Stream buffering done (5 ms in 5 ms)
main debug: Decoder wait done in 0 ms
avaudiocapture debug: AVCapture: Audio device ready!
main debug: using access_demux module "avaudiocapture"
main debug: looking for audio decoder module matching "any": 21 candidates
araw debug: samplerate:44100Hz channels:2 bits/sample:32
main debug: using audio decoder module "araw"
main debug: looking for meta reader module matching "any": 2 candidates
main debug: no meta reader modules matched
main debug: looking for meta reader module matching "any": 2 candidates
main debug: no meta reader modules matched
main debug: `avaudiocapture://BlackHole2ch_UID' successfully opened
main error: demux doesn't like DEMUX_GET_TIME
main debug: reusing audio output
main debug: VLC is looking for: 'f32l' 44100 Hz Stereo frame=1 samples/8 bytes
auhal debug: attempting to use device 103
auhal debug: Current device has a latency of 3265 us
auhal debug: output layout of AUHAL is Stereo
auhal debug: selected 2 physical channels for device output
auhal debug: VLC will output: Stereo
auhal debug: Current AU format: [44100.000000][mcpl][9][8][1][8][2][32]
auhal debug: analog output successfully opened
main debug: output 'f32l' 44100 Hz Stereo frame=1 samples/8 bytes
main debug: looking for audio volume module matching "any": 2 candidates
main debug: using audio volume module "float_mixer"
main debug: input 'f32l' 44100 Hz Stereo frame=1 samples/8 bytes
main debug: conversion: 'f32l'->'f32l' 44100 Hz->44100 Hz Stereo->Stereo
main debug: conversion pipeline complete
main debug: looking for audio resampler module matching "none": 3 candidates
main debug: no audio resampler modules matched