Blackmagic Forum

I've seen this mentioned here for the past couple of versions of Resolve but it continues to be an issue. No audio will play unless I change the bitrate of my audio hardware to match what Resolve uses. Problem with this is, that my computer doesn't like when I change the bitrate of my audio interface to anything lower than its max, thus breaking my entire system if I do. Considering the addition of Fairlight, it boggles my mind that this limitation exists.

srdela wrote:I've seen this mentioned here for the past couple of versions of Resolve but it continues to be an issue. No audio will play unless I change the bitrate of my audio hardware to match what Resolve uses. Problem with this is, that my computer doesn't like when I change the bitrate of my audio interface to anything lower than its max, thus breaking my entire system if I do. Considering the addition of Fairlight, it boggles my mind that this limitation exists.

Can you give us some numbers on what wasn't working and what you change to get it working.
Also what audio hardware/interface are you using?

(Bitrate) Bit Depth normally less of a problem than sample rate for having no sound in audio software.

I have a Behringer UMC202HD Audio interface at 24bit, 192kHz. I've read on forums that changing it to 16bit fixes the no sound issue. I just tried this myself, and while Resolve is finally reading the audio levels (it always remained at 0db before), I still get no audio out from my speakers. I've gone into the Video and Audio I/O settings to make sure that the Output assignments were set properly, which they are now. I should also mention that these settings are not able to be changed when my audio interface is set to 24bit, 192kHz quality. Instead showing "Un-assigned" for both channels.

Resolve does not support 192KHz sampling rate for monitoring playback. You should use 48KHz as this is the standard broadcast sample rate and is well supported in Resolve. Bit depth can sometimes be an issue (16bit vs 24bit vs 32 bit), but bitrate is usually irrelevant for monitoring.

srdela wrote:I have a Behringer UMC202HD Audio interface at 24bit, 192kHz. I've read on forums that changing it to 16bit fixes the no sound issue. I just tried this myself, and while Resolve is finally reading the audio levels (it always remained at 0db before), I still get no audio out from my speakers. I've gone into the Video and Audio I/O settings to make sure that the Output assignments were set properly, which they are now. I should also mention that these settings are not able to be changed when my audio interface is set to 24bit, 192kHz quality. Instead showing "Un-assigned" for both channels.

This issue will be a fixed in the next v15 beta update.

Great to hear, thank you!

I have a basic question about audio bit depth:

I have a sound mixer/recorder that only records in 32-bit floating point (not the more standard 24). I can convert it to 24-bit in post before importing into Fairlight, but am wondering whether that would be necessary, or if Fairlight can handle audio files with 32-bit depth. I'm recording at 48 khz, 32-bit. And would it be a problem if some of the sound files in my project are at 32-bit and others are at 24-bit?

I can test both of these in my timeline to see for myself, but to save a bit of time I wanted to check first to see if anyone knows.