wasapi-exclusive-buffer ?

[NeilTohno]

Important Information

Provide following Information:

• Windows Version
  Windows 10 22H2

• Source of the mpv binary
  https://github.com/shinchiro/mpv-winbuild-cmake/releases/tag/20240426

• If known which version of mpv introduced the problem

--wasapi-exclusive-buffer=<default|min|1-2000000>
Set buffer duration in exclusive mode (i.e., with --audio-exclusive=yes). default and min use the default and minimum device period reported by WASAPI, respectively. You can also directly specify the buffer duration in microseconds, in which case a duration shorter than the minimum device period will be rounded up to the minimum period.

The default buffer duration should provide robust playback in most cases, but reportedly on some devices there are glitches following stream resets under the default setting. In such cases, specifying a shorter duration might help.

https://mpv.io/manual/master/#audio-output-drivers-wasapi-exclusive-buffer

I set wasapi-exclusive-buffer=5 (ms), and I found that the result is 5 us,
Thanks.

mpv.exe --ao=wasapi --audio-exclusive=yes --wasapi-exclusive-buffer=5 --log-file="Y:/mpv.log" "Y:\TT3\02.mkv"

Log file

[   0.610][d][ao/wasapi] IAudioClient::GetDevicePeriod
[   0.610][v][ao/wasapi] Device period: default 10000 us, minimum 3000 us
[   0.610][v][ao/wasapi] Requested buffer duration: 5 us
[   0.610][v][ao/wasapi] Trying buffer duration 3000 us
[   0.610][d][ao/wasapi] IAudioClient::Initialize
[   0.642][d][ao/wasapi] IAudioClient::Initialize pRenderClient
[   0.642][d][ao/wasapi] IAudioClient::Initialize IAudioClient_SetEventHandle
[   0.642][d][ao/wasapi] IAudioClient::Initialize IAudioClient_GetBufferSize
[   0.642][v][ao/wasapi] Buffer frame count: 144 (3000 us)
[   0.642][v][ao/wasapi] IAudioClock::GetFrequency gave a frequency of 48000.
[   0.643][d][ao/wasapi] Activating pEndpointVolume interface
[   0.644][d][ao/wasapi] IAudioEndpointVolume::QueryHardwareSupport
[   0.644][d][ao/wasapi] Entering dispatch loop
[   0.644][d][ao/wasapi] Init wasapi done
[   0.644][v][ao/wasapi] device buffer: 144 samples.
[   0.644][v][ao/wasapi] using soft-buffer of 9600 samples.

log.zip

And, who can tell me which value is most suitable? I prefer large buffers.
Thank you.

[ruihe774]

You can also directly specify the buffer duration in microseconds

"microseconds" is us. ms is "milliseconds".

[NeilTohno]

You can also directly specify the buffer duration in microseconds

"microseconds" is us. ms is "milliseconds".

Thanks.

[Jules-A]

Maybe worth including the unit prefix in the documentation?

[ruihe774]

I added the following code to the config file, will this cause any problems?

# Audio #

ad-lavc-threads=12
ao=wasapi
audio-exclusive=yes
wasapi-exclusive-buffer=6000 #min

audio-format=float
audio-channels=stereo
audio-swresample-o=resampler=soxr,precision=33
audio-swresample-o-append=cheby=1
audio-swresample-o-append=cutoff=1.00
audio-swresample-o-append=osf=fltp

# fix bgm too loud and speech too quiet
#af=lavfi="loudnorm=I=-16:TP=-3:LRA=4"
af=lavfi="loudnorm=I=-17:TP=-1:LRA=11"

It's not related to the issue; you can convert this issue to a disscussion.