Coreaudio_exclusive only work with audio-format=s16 on a 24bit external DAC

mpv version and platform

MacOS 10.12.5 (16F73), MPV Git 7e889e5

Reproduction steps

Run with -no-config -audio-format=s16 -audio-exclusive=yes and -no-config -audio-format=s24 -audio-exclusive=yes

The specification of my DAC. It is 24 bit compatible.
"[ 0.292][v][ao/coreaudio_exclusive] - 192000.0Hz 24bit mcpl [4][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 176400.0Hz 24bit mcpl [4][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 96000.0Hz 24bit mcpl [4][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 88200.0Hz 24bit mcpl [4][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 48000.0Hz 24bit mcpl [4][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 44100.0Hz 24bit mcpl [4][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 192000.0Hz 16bit mcpl [12][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 176400.0Hz 16bit mcpl [12][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 96000.0Hz 16bit mcpl [12][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 88200.0Hz 16bit mcpl [12][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 48000.0Hz 16bit mcpl [12][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 44100.0Hz 16bit mcpl [12][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 192000.0Hz 24bit mcpl [68][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 176400.0Hz 24bit mcpl [68][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 96000.0Hz 24bit mcpl [68][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 88200.0Hz 24bit mcpl [68][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 48000.0Hz 24bit mcpl [68][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 44100.0Hz 24bit mcpl [68][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 0.292][v][ao/coreaudio_exclusive] - 192000.0Hz 16bit mcpl [76][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 176400.0Hz 16bit mcpl [76][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 96000.0Hz 16bit mcpl [76][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 88200.0Hz 16bit mcpl [76][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 48000.0Hz 16bit mcpl [76][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)
[ 0.292][v][ao/coreaudio_exclusive] - 44100.0Hz 16bit mcpl [76][4bpp][1fbp][4bpf][2ch] int LE S packed (s16)"

Expected behavior

Both audio-format=s16 and audio-format=s24should work properly

Actual behavior

audio-format=s16 works fine. audio-format=s24 terminates.

Error message:
"[ 1.009][v][ao/coreaudio_exclusive] virtual format 96000.0Hz 24bit mcpl [68][8bpp][1fbp][8bpf][2ch] int LE S (-)
[ 1.009][e][ao/coreaudio_exclusive] hardware format not supported
[ 1.009][e][ao] Failed to initialize audio driver 'coreaudio'
[ 1.009][e][cplayer] Could not open/initialize audio device -> no sound.
[ 1.009][v][ad] Uninit audio decoder.
[ 1.009][v][af] Removing filter lavrresample
[ 1.010][i][cplayer] Audio: no audio
[ 1.010][v][cplayer] playback restart complete
[ 1.010][v][cplayer] EOF code: 1
[ 1.010][v][vd] Uninit video.
[ 1.010][v][cplayer] finished playback, audio output initialization failed (reason 4)"

Log file

s16.log
s24.log

Sample files

Sample files needed to reproduce this issue can be uploaded to https://0x0.st/
or similar sites. (Only needed if the issue cannot be reproduced without it.)

Start at the ao/coreaudio_exclusive audio-output entry point and compare the s16 and s24 reproduction commands with the linked s16.log and s24.log output. Done means playback initializes successfully with audio-format=s24 as well as audio-format=s16 on the reported 24-bit DAC.