Wasapi bug

[Srenard27]

Hello,
as it is explained in this forum : http://wiki.jriver.com/index.php/WASAPI , due to a bug in Microsoft's WASAPI system itself, some devices (USB DAC's) will start stuttering during playback when using WASAPI. You can find an example : http://hotfile.com/dl/66831334/61260...Flac.flac.html
I have this problem using Reclock with WASAPI EXCLUSIVE and a DAC. It happens very rarely but sometimes the sound begins to slutter as in the example above. It is impossible to determine when it happens, you can watch the same movie several times, it may not happen or it may happen one or twice (I had this problem with TMT5 and KM Player , I have tried many different settings before I discovered it was due to WASAPI itself ). If you stop the movie and start again, the sound is normal again.
Is there a way to avoid this problem using WASAPI with Reclock? I had to go back to Direct Sound to fix that and I still wonder if there is another solution with Reclock.
Best regards,
Sylvain

[namaiki]

Try make the buffer setting in ReClock Configuration larger.

[Srenard27]

Originally Posted by namaiki

Try make the buffer setting in ReClock Configuration larger.

Thank you for your answer. I tried 1000 ms instead of 500 ms, but with this setting, image and sound are not synchronised any more . The voice is heard a few moment after the lips begin to move...

[namaiki]

Originally Posted by Srenard27

Thank you for your answer. I tried 1000 ms instead of 500 ms, but with this setting, image and sound are not synchronised any more . The voice is heard a few moment after the lips begin to move...

I don't recall experiencing such a bug. Did you only change the "Sound pre-buffer" setting?

[Srenard27]

Originally Posted by namaiki

I don't recall experiencing such a bug. Did you only change the "Sound pre-buffer" setting?

Absolutely. With 500 ms it's perfect. With 1000 ms, sound is delayed with Direct Sound and Wasapi exclusive, with a display rate of 25 Hz or 24 Hz, this problem is still here.
And I can easely hear that the value of pre-buffer has changed, because at the beginning of the movie, if the frequency of the movie is accelerated from 23,976 Hz to 25 Hz for instance, you briefly hear the sound at the normal pitch then a silence and then the sound comes back at a faster pitch. With 100 ms the silence is short, with 1000 ms the silence is about 1 s. It "works" but sound is delayed.
1000 ms is the maximum you can set.

[James]

Originally Posted by namaiki

Try make the buffer setting in ReClock Configuration larger.

This doesn't change the Wasapi buffer size. But there is a registry value for this:
DWORD WasapiBufferSize (Default=100)

If change was successfull, you'll see it in the logfile

"Requested WASAPI bufferDuration ... ms"

[Srenard27]

Originally Posted by James

This doesn't change the Wasapi buffer size. But there is a registry value for this:
DWORD WasapiBufferSize (Default=100)

If change was successfull, you'll see it in the logfile

"Requested WASAPI bufferDuration ... ms"

Thank you James.
I have modified the registry as you told me. After that, in the log file, I could read :

Requested WASAPI bufferDuration 200 ms
.......
WasapiClient Audio Buffsize (ms): 200
......

It seems OK but a few lines after there is :

WARNING WASAPI buffer overflow!
WARNING WASAPI buffer overflow!

I will try other values...

[Srenard27]

Originally Posted by Srenard27

I will try other values...

634 ms is the maximum I can set.
With 635 ms or more I get this message in the log file (+ a message in a little window and no sound) :

ERROR Initialize WasapiClient failed hr=88890016

Now I will watch all movies with a 634 ms buffer size and see if the sluttering sound occurs agains.