Audio glitches

[Rene]

There are sometimes glitches/ticks/cracks in the audio when I trigger or stop an audio clip. Even if the clip is audio only!

Is there anything besides the buffer size I could try?

The audio files are uncompressed PCM 44.1kHz 16bit aiffs.

[kmifflin]

What sound card are you using? Is it the on board or a professional card?
Why isn't increasing the buffer an option?

[Rene]

What sound card are you using? Is it the on board or a professional card?

I tried with the onboard of the MacBook Pro and also with an external pro card.

Why isn't increasing the buffer an option?

It is an option, but does not change anything. So I'm looking for other options.

[kmifflin]

I find increasing the buffer size to 1024, then saving, exiting and reopening resolume can solve the issues your having.

[Rene]

Kmifflin, thanks for your hints. I just tried with the on board soundcard and 1024 buffer size. Even after a restart of Arena, the issue persists. I'll try with the external soundcard next week.

[kmifflin]

Not sure if ts would matter but have you tried looking at the audio midi setup app in you utilities folder. I would make sure that your settings match. ie 44100 or 48000 and 16 bit

[Rene]

kmifflin, yes I've also checked my audio settings. Everything is set to 44.100kHz 16bit.

I think everything boils down to performance when reading data from the disk after I trigger AV clips. I see that the glitches become worse, when Resolume's frame rate goes down (when I play a lot of other video clips for example). Also if FPS in Resolume are between 15 and 25 there is a noticeable lag after triggering (in beat snap 4 bar mode).

Does Resolume 'pre-laod' clips when I trigger them, and the countdown of the beatsnap starts?

Because I really want to solve this issue (lags and glitches are a show-stoper right now), I set up a RAMDrive (sounds like something from the 90's!). And glitches are very rare now, also FPS is always around 60 with 3 layers of 720p DXV footage.

So it seems there is a link between FPS and glitches/lag.

Who else uses the audio features of Resolume, and what are your experiences? FPS? Do you use SSD, HDD? RAID0, etc.?

[Rene]

Okay, still no success.

Now I converted all videos to DXV 540p, all audios are AIFF 44.1kHz, 16-bit uncompressed. All files used in the composition are on a RAM-disk.

Even with this setup (I get 60fps, CPU usage is always below 30% ) there are still glitches, less often, but still there.

The logfiles says (very often) 'No Samples buffered when trying to get audio' - is there anything I can do against this?

Please, can somebody of the support team have a look on this?

[Joris]

That error means that Resolume is trying to buffer more often than it's actually getting samples. Have you tried decreasing the buffer size?

[Rene]

Hi Joris,

thanks for having a look on that!

I just tried to decrease the buffer. I get this error even with a buffersize set to 32 (but then I can hear when I scroll ) So 128 seems to be the best solution right now.

Does the soundcard influence such glitches? (will try tomorrow with an external one)
Would it help to convert to WAV?